Week of Monday, March 30

This is the Saint Louis Science Center’s NIGHT SKY UPDATE for the week of Monday, March 30.  All times are given as local St. Louis time (Central Daylight Time).  For definitions of terminology used in the night sky update, click the highlighted text. 

Information updated weekly or as needed. 

Join us for our next star party, Friday, April 3, 2015 held in association with the St. Louis Astronomical Society.  For details, see the information at the bottom of this page. 

The Sun and the Moon 

Sunrise is at 6:49 a.m. on Monday, March 30 and sunset is at 7:22 p.m. providing us with about 12.5 hours of daylight.  Even after sunset, the light from the Sun will still dimly illuminate our sky for about 1.5 hours.  This period of time is called twilight, which ends around 8:53 p.m. this week.  For those with a sun dial, solar transit or local noon occurs around 1:05 p.m. this week.       

Day

Sunrise

Sunset

30 Mar

6:49 a.m.

7:22 p.m.

31 Mar

6:48 a.m.

7:23 p.m.

01 Apr

6:46 a.m.

7:24 p.m.

02 Apr

6:45 a.m.

7:25 p.m.

03 Apr

6:43 a.m.

7:26 p.m.

04 Apr

6:42 a.m.

7:27 p.m.

05 Apr

6:40 a.m.

7:28 p.m.

06 Apr

6:39 a.m.

7:29 p.m.

           

Moonrise for Monday, March 30 occurs at 3:15 p.m. and moonset will occur at 4:45 a.m. on the following day.  On Monday, March 30 the Moon will be exhibiting a waxing gibbous phase with about 81% of the lunar disk illuminated.  Full moon occurs on Saturday, April 4.  April’s full moon is called the Full Pink Moon. 

On Saturday, April 4th there will be a total lunar eclipse.  This is the third total lunar eclipse in a row which will be followed by a fourth later this year in September.  When four total lunar eclipses occur in a row it is called a lunar tetrad of which 6 more will occur this century.  

The Total lunar eclipse on April 4th will occur as the Moon enters the darkest part of the Earth’s shadow called the umbra.  When completely within this part of our shadow the Moon will take on a reddish color as a little bit of red light filters through our atmosphere.  This total lunar eclipse is very short lasting for only a few minutes.  Totality starts at 5:57 a.m. CDT and ends at 6:02 a.m. CDT.  The reason for such a short eclipse is due to the geometry of the Moon’s and Earth’s orbits relative to the Sun.  

Another complication for this eclipse is it happens shortly before sunrise meaning the Moon will be very low in the west.  To ensure you can see the eclipse you will have to find a western view that is mostly free of trees and buildings.  Below you will find a map that has all relevant information for the eclipse.  Be aware that the times listed on the map will be in UTC so you will have to subtract 6 hours to make it Central Daylight Time (CDT). 

http://eclipse.gsfc.nasa.gov/LEplot/LEplot2001/LE2015Apr04T.pdf  

International Space Station (ISS) Observing 

Visible passes of ISS from St. Louis this week occur during the morning and evening hours.  The best of these passes are on March 31, April 3 and April 5.  Use the table below for information on when and where to look for ISS this week. 

Catch ISS flying over St. Louis in the morning and evening hours starting Monday, March 30.  

Date

Mag

Starts

Max. altitude

Ends

Time

Alt.

Az.

Time

Alt.

Az.

Time

Alt.

Az.

31 Mar

-3.4

05:17:27

41

NW

05:18:26

85

NE

05:21:39

10

SE

01 Apr

-0.6

04:27:09

17

E

04:27:09

17

E

04:28:02

10

ESE

01 Apr

-1.7

05:59:49

14

W

06:01:08

18

SW

06:03:22

10

S

02 Apr

-1.3

05:09:50

17

SSE

05:09:50

17

SSE

05:10:47

10

SSE

03 Apr

-3.4

20:48:51

10

SW

20:52:04

65

SE

20:52:42

50

E

04 Apr

-2.4

19:55:43

10

SSW

19:58:36

29

SE

20:01:31

10

ENE

04 Apr

-1.4

21:32:05

10

W

21:34:59

28

NNW

21:35:09

28

NNW

05 Apr

-2.5

20:38:05

10

WSW

20:41:17

51

NW

20:44:29

10

NE

06 Apr

-0.5

21:22:06

10

WNW

21:24:23

17

NNW

21:26:23

11

NNE  

Magnitude (Mag): The Measure of brightness for a celestial object.  The lower the value is, the brighter the object will be. 

Altitude (Alt):  The angle of a celestial object measured upwards from the observer’s horizon. 

Azimuth (Az):  The direction of a celestial object, measured clockwise from an observer’s location with north being 0°, east being 90°, south being 180° and west being 270°.  

For information about ISS flyovers and other visible satellites, visit www.heavens-above.com 

Detailed information regarding all unmanned exploration of our universe, missions past, present, and planned, can be found at Jet Propulsion Laboratories:

http://www.jpl.nasa.gov/ 

The Planets Visible Without A Telescope

Venus

The second planet from the Sun is out of the glare of the Sun and will be visible shortly after sunset.  Venus will be seen about 20 minutes after sunset low in the southwest and will set by 10:22 p.m.  Venus will continue to climb above the western horizon until June 6 when it reaches maximum eastern elongation.  After this Venus will begin to head back into the glare of the Sun. 

Mars

Mars is now in the constellation Pisces and rises before the Sun sets.  Mars will be seen in the southwestern skies about 30 minutes after sunset.  Mars will set by 8:54 p.m.   

Jupiter

The largest planet in the solar system has returned to our evening skies.  Jupiter is now rising before the Sun sets and as such will be visible about 20 minutes after sunset in our eastern skies.  Jupiter is currently located in the constellation Cancer the Crab and will set by 4:32 a.m. 

If you keep track of Jupiter once a week through July you will notice what is called retrograde motion.  This is cause as we catch up with a planet in our orbit and then pass it by.  This will make the planet look like it stops and then moves in the opposite direction.  This is due to the changing angles we see Jupiter with respect to the background star field.  Jupiter right now is exhibiting a western motion and by July will have returned to its eastern motion.  This type of motion is what ancient astronomers noticed that lead them to name the planets Aster Planetes or wandering stars. 

Saturn

Saturn is now well out of the glare of the Sun but it remains an early morning object for the time being.  Saturn rises as 11:43 p.m. but you will have to wait until near 1:00 a.m. to get a decent view of the ringed planet.  Saturn will rise about 30 minutes earlier than it did the week before as it approaches opposition on May 22, 2015.   

Messier Object of the Week

For the last few years the night sky update included a section that highlighted one constellation a month and a few objects of interest inside of it.  Unfortunately of the 88 constellations there are only about 60 we can see in St. Louis and of these there are only so many that have enough objects to reference that would interest both beginners and advanced observers.  So in 2015 we will change things a bit for this section and instead of highlighting one constellation for each month we will highlight one Messier object a week using the Astronomical League’s Binocular Messier program as our guide.  

The Astronomical League is an amateur astronomy society that is composed of over 240 local amateur astronomy societies across the United States and includes members at large and other supporting members.  Their goal is to promote the science of astronomy through education, incentive and communication.  

One of the many ways the Astronomical League has assisted amateur astronomers around the world is by creating various observing programs that highlight different aspects of astronomy and how an amateur astronomer can observe the sky and learn more about astronomy in doing so.  Some of these programs are introductory and are targeted at those beginning to learn about observational astronomy and some are extremely advanced, require specialized equipment and require a large amount of time to complete.  These observing programs cover most any type of object or way to observe the sky so everyone should be able to find one that matches their interests and abilities.  It is important to note that these programs are not part of any class or lecture series but are rather lists of objects that highlight types of objects or observing methods relevant to astronomy.  Taking part in these programs is done under one’s own choice.  To officially complete each program you do have to be a member of the Astronomical League but you do not have to join to use them as observing guides or education tools.  I would urge anyone interested in astronomy to look at these programs as they will help organize observing sessions and will help refine observing skills you already have.  You can find out more information about the Astronomical League’s observing programs here https://www.astroleague.org/observing.html 

The observing program we will use to help guide us through the 2015 observing year is the Binocular Messier Program.  This is a program that will appeal to both beginning and advance observers.  Too often it is thought that you need to have a telescope for astronomical observations.  Telescopes make great observing tools and yes they can show you more than binoculars but they do have their limitations.  Cost, size, weight and complexity will often be a surprise to people when they first learn about telescopes.  These factors can keep people from using telescopes they own or from buying one at all.  The best advice to follow is a good observing tool is one you will use.  

The binocular observing program is an introduction to the Messier catalog.  The Messier catalog was created by French astronomy Charles Messier.  He was a comet hunter that would periodically find objects that could be confused for comets.  To help others avoid these objects when looking for comets he created a list that consists of objects that today we know are star clusters, nebula and galaxies.  The Messier catalog is a great introduction to deep sky observing for northern hemisphere observers and as such it will be our guide for each week of 2015.  Each week we will highlight a Messier object that is part of the Astronomical League’s binocular Messier program.  I would urge each observer to fulfill the requirements of the program even if you do not intend to join the League for completion.  The requirements involve logging observing data that can help refine observing skills that will be useful later down the road.  If you have an interest in astronomy and learning more about observational astronomy I would also recommend checking out one of the two excellent astronomy societies near St. Louis.  Both are members of the Astronomical League and both do numerous public observing nights around town.  These clubs are the

St. Louis Astronomical Society and

Astronomical Society of Eastern Missouri

If you do not live in the St. Louis, Missouri area chances are you have similar astronomical societies where you live.  

The Messier object for the week of March 2 is the open star cluster Messier 44 (M44).  Like last month we are starting off with an easy target for all binoculars.  After observing and reading further on this week’s object you will quickly realize that a simple target can be quite rewarding.  M44 is a group of at least 350 stars that lie at a distance of 577 light years.  This group of young stars is estimated to be 730 million years old.  As would be expected of a cluster this old when its stars are plotted on an H-R Diagram it reveals mostly stars still on their main sequence with a few giant stars, a handful of stars transitioning to their giant phases and a few highly evolved white dwarf stars.  Star clusters like M44 are excellent targets for studying the life cycle of stars.  

M44 shines with an apparent magnitude of 3.7 making it visible to the unaided eye.  Due to this brightness M44 has been known about since ancient times.  When viewed with the naked eye M44 will look like a dim nebulous patch of light.  It was first resolved into individual stars by Galileo who could see a bit over 30 stars.  Today many of our binoculars are more powerful than the telescopes Galileo used so M44 will be a great target for binocular observers.  Using large telescopes nearly 200 of the estimated 350 component stars can be observed. 

Due to its age and proper motion it is believed that M44 may be related to another open star cluster called the Hyades.  With an estimated age of 790 million years and a similar direction of motion it is believed the M44 and the Hyades formed from the same large complex of dust and gas.  If you would like to see the Hyades look for the V-shape of stars near M45 in Taurus the Bull.     

M44 also contains a number of interesting stars.  There are a few stars that contain planetary disks likely indicating planet formation.  There are a few stars that have been discovered to already have planets.  Also of interest might be the eclipsing binary star TX Cancri and the star Epsilon Cancri for its unique spectrum.  The later of these will be more of interest to those that have access to a low resolution spectroscope.  

To find M44 you need to locate the constellation Cancer the Crab.  Cancer will appear as an upside down Y-shape that can be seen in the eastern sky after sunset.  The trouble with the constellation Cancer is most of its stars are no brighter than 4th magnitude.  This means if you observe in light polluted conditions this will be a difficult constellation to see.  The trick to finding the constellation Cancer is to first locate the constellations Gemini and Leo.  These are much brighter and are easily identified by their shapes.  Gemini is a large rectangle above the constellation Orion and Leo has a bright backwards question mark shape just below the Big Dipper.  Once you can find these look between them and there is a relatively sparse patch of sky which is the constellation Cancer.  Once in the vicinity look near the mid-section of this sparse patch of sky and there will be a dim patch of light.  This is the open star cluster M44.  Another way to find M44 is to locate the bright stars Castor and Pollux in Gemini and Regulus in Leo.  About halfway between these stars is where you will find M44.  A third way to find M44 is by locating the planet Jupiter.  Jupiter is currently in the constellation Cancer and if you can spot this planet M44 will be about one binocular field to the right.  Keep in mind that this trick will only work for a short time as Jupiter will leave the constellation Cancer by July of 2015.  Use the maps below and you should have no problem finding M44.

http://www.iau.org/static/public/constellations/gif/CNC.gif

http://www.iau.org/static/public/constellations/gif/LEO.gif

http://www.iau.org/static/public/constellations/gif/GEM.gif 

The Messier object for the week of March 9 is the open star cluster Messier 67 (M67).  Like last week’s object M67 is an open star cluster that is found within the Milky Way galaxy.  Lying at a distance of about 2,700 light years M67 shines with an apparent magnitude of 6.1.  At this magnitude M67 will be considerably dimmer then last week’s star cluster M44.  At 6.1 magnitude M67 will still be an easy target through binoculars however due to light pollution it will not be quite as obvious and may take a bit longer to find.  

M67 is estimated to have at least 500 stars of which nearly 100 of them are similar to the Sun.  The Trumpler Classification for M67 is II, 2, r meaning it is detached form background stars exhibiting a slight concentration of stars, its stars have a moderate range in brightness and it is a rich star cluster.  All of this information seems similar to other open star clusters covered so far however M67 is not like the others.  What makes M67 different is its age.  Most open star clusters will last for a few hundred million years.  Eventually gravitational interactions inside and outside of these open star clusters will cause the star cluster to break apart.  M67 is estimated to have an age between 3.2 billion to 5 billion years making it one of the oldest open star clusters in the Milky Way galaxy that we know of.  Astronomical modeling suggests that only the most massive of these open star clusters will last this long and some estimates suggest that M67 has lost about 90% of its mass due to mass loss and member stars escaping.  

M67 will be simple to find if you located last week’s star cluster M44.  M67 is also located in the constellation Cancer the Crab and can be found about 10 degrees south of M44.  If you have trouble locating M67 another point of reference is the star Alpha Cancri.  The constellation Cancer looks like an upside down Y-shape of stars.  Alpha Cancri represents the eastern branch of the Y-shape.  M67 can be found about 2 degrees west of this star.  Use the map below to help find M67 and remember the first step to finding the constellation Cancer is to first locate the constellations Leo and Gemini.  Between these two bright constellations is a dim patch of sky which is where you should start looking for the upside down Y-shape of the constellation Cancer. 

http://www.iau.org/static/public/constellations/gif/CNC.gif 

The Messier object for the week of March 16 is the galaxy Messier 81 (M81) also known as Bodes Galaxy.  Edwin Hubble labeled M81 as a grand design galaxy meaning it has a nearly perfect spiral shape.  M81 is a galaxy that lies at a distance of 11.8 million light years and shines with an apparent magnitude of 6.94.  At this brightness M81 is a binocular target however due to the low surface brightness it will not be an easy target.  M81 it will appear as a fuzzy object in which you might notice the center to be a bit brighter than the rest of the galaxy.  In this day and age in which amazing Hubble Telescope images are available at our fingertips a view as described above may not sound that appealing.  It is true that binocular views of galaxies are not going compare to a telescope view however you are still looking at light that has traveled for nearly 12 million years before you could see it.  A great deal of the enjoyment involved with backyard astronomy is learning about what you are looking at.  

One interesting feature of M81 is it is a member of a galaxy group called the M81 group.  Much like stars can be clustered together so can galaxies.  The members of the M81 galaxy group are spread through the constellations Ursa Major and Camelopardalis.  There are a number of galaxy groups you can explore from your backyard but only a few have members that are easily observed in binoculars.  Some of the best of these are visible in the spring months and they include the M96 group and the Leo Triplet in the constellation Leo and Markarian’s Chain in the constellation Virgo which is part of the Virgo Galaxy Cluster.  

To find M81 first locate the Big Dipper in the constellation Ursa Major.  Once you have done this locate the stars in the Big Dipper’s bowl called Phecda and Dubhe.  If you follow a path from Phecda to Dubhe and then continue in the same direction traveling that distance once again you will find M81 and another member of the M81 Group called M82.  M82 will be next week’s Messier object.  Light pollution will make M81 a bit tricky to find so you might want to find a map that has stars down to 8th magnitude.  Learning the star field near M81 will be very helpful so if you cannot find a map with enough detail you can also rely on the free planetarium software Stellarium.

For help identifying the guide stars listed above use the map linked below.

http://www.iau.org/static/public/constellations/gif/UMA.gif 

The Messier object for the week of March 23 is the galaxy Messier 82 (M82) also known as the Cigar galaxy.  M82 is another fine galaxy available to binoculars observers even if some light pollution is present.  At a distance of roughly 12 million light years it shines with an apparent magnitude of 8.4.  At this magnitude it will be dimmer than last week’s galaxy M81 but it will still remain visible through binoculars.  

At 12 million light years away it is another member of the M81 group of galaxies that are found in the constellations Ursa Major and Camelopardalis.  In fact about 100 million years ago M82 and M81 passed near enough to one another that gravitational disruptions occurred in each galaxy changing their shape and sparking high rates of star formation.  When you look at M82 through a telescope the core of the galaxy looks uneven which is a direct result of the gravitational effects induced during its last near pass of M81.  M82 was originally recorded as an irregular galaxy but it is likely a spiral galaxy that had its disk distorted by its passes near M81.  

M82 is also called a star burst galaxy which is confirmed by the strong presence of ionized hydrogen in the galaxy’s spectrum.  Additional confirmation of this has been seen by the Hubble Space Telescope.  The Hubble has observed a number of young stars cluster near the disrupted core of M82.  These clusters have an average mass of 200,000 solar masses which is extraordinarily for young galactic star clusters.  The gravitational disruptions that warped the core of M82 and sparked high rates of star formation is what is in store for our galaxy the Milky Way.  In about four billion years the Milky Way and the Andromeda galaxies will merge.  

M82 can be found in the same part of the sky as last week’s galaxy M81.  In fact using binoculars M82 and M81 can be found in the same field of view.  To find these galaxies first locate the Big Dipper in the constellation Ursa Major.  Once you have done this locate the stars in the Big Dipper’s bowl called Phecda and Dubhe.  If you follow a path from Phecda to Dubhe and then continue in the same direction traveling that distance once again you will find M82 and last week’s galaxy M81.  Learning the star field near M82 will be very helpful so if you cannot find a map with enough detail you can also rely on the free planetarium software Stellarium.

For help identifying the guide stars listed above use the map linked below.

http://www.iau.org/static/public/constellations/gif/UMA.gif 

The Messier object for the week of March 30 is the open star cluster Messier 48 (M48).  This is an open star cluster that contains about 80 stars that is found in the constellation Hydra.  At a distance of roughly 1,500 light years M48 shines with an apparent magnitude of 5.5.  At this magnitude M48 is bright enough that it is visible with unaided eye from dark locations but binoculars will be needed for those that contend with light pollution.  Through binoculars you will easily resolve about 30 - 50 stars in M48 that cover about half a degree of the sky.  Due to its large apparent dimensions M48 will be best viewed at low powers whether you use binoculars or a telescope. 

The stars in M48 are estimated to be about 300 million years old and as such there are a number of stars that have evolved off their main sequence.  This fact can be observed by the presence of a handful of yellow and red giant stars.  M48 has a Trumpler classification I, 2, m which means it is detached with a strong central concentration; its stars exhibit a moderate range in brightness and it has between 50 and 100 stars.          

To find M48 you will have to go out in the early evening and look to the southwest.  Even though the constellation Hydra is considered to be a spring constellation M48 is found in an area that is near the divide between the winter and spring skies.  As it is near the winter/spring border start by finding Orion the Hunter.  Once you have done this look for three bright stars that form a large triangle shape; this is called the winter triangle.  The stars in the triangle shape are Sirius (Canis Major, Procyon (Canis Minor) and Betelgeuse (Orion).  The top left corner of the triangle is the star Procyon and this will be our bright reference when tracking down M48.  Just above and to the right is another semi bright star called Beta CMi.  If you follow a line from Beta CMi to Procyon (Alpha CMi) it will take you right to M48.  From Procyon to M48 you have to cover about 14 degrees of sky.  Below you will find maps for the Constellations Hydra, Canis Minor, Monoceros and Orion.  These will help you find the guide stars mentioned above and help you become familiar with the part of the sky you will be scanning.

http://www.iau.org/static/public/constellations/gif/HYA.gif

http://www.iau.org/public/themes/constellations/#cmi

http://www.iau.org/static/public/constellations/gif/MON.gif

http://www.iau.org/static/public/constellations/gif/ORI.gif 

The binocular Messier list we are using is the appendix A list for the Astronomical League’s Binocular Messier program.  I choose to use this list because it easier and for the most part can be completed with 7x35 binoculars.  I choose the easier list as most of us contend with light pollution making the dimmer objects very difficult to find here in the city.  The downside to this list is it doesn’t contain many spring Messier objects.  Because of this for the next handful of weeks our objects will require us to look at the winter sky in the early evening or the summer sky in the early morning.           

Our next Star Party will be held on Friday, April 3, 2015, from dusk until 10 p.m. 

Weather permitting, the St. Louis Astronomical Society and the Science Center will set up a number of telescopes outdoors and be on-hand to answer your questions.  Telescope viewing begins around 8 p.m.  Regardless of the weather on April 3, join us indoors in our planetarium theater for “The Sky Tonight”.  Showtime is at 7 p.m. 

This free, indoor star program will introduce you to the current night sky, the planets, and the seasonal constellations. Doors open 15 minutes before show time. Shows begins at 7 p.m. Sorry, no late admissions due to safety issues in the darkened theater. 

The St. Louis Astronomical Society helps host the monthly Star Parties at the Saint Louis Science Center which are held on the first Friday of each month. Our Monthly Star Parties are open to the public and free of charge.  For more information about the St. Louis Astronomical Society visit their website at www.slasonline.org

Week of Monday, March 9

This is the Saint Louis Science Center’s NIGHT SKY UPDATE for the week of Monday, March 9.  All times are given as local St. Louis time (Central Daylight Time).  For definitions of terminology used in the night sky update, click the highlighted text. 

Information updated weekly or as needed. 

Join us for our next star party, Friday, April 3, 2015 held in association with the St. Louis Astronomical Society.  For details, see the information at the bottom of this page. 

The Sun and the Moon 

Sunrise is at 7:22 a.m. on Monday, March 9 and sunset is at 7:02 p.m. providing us with nearly 12 hours of daylight.  Even after sunset, the light from the Sun will still dimly illuminate our sky for about 1.5 hours.  This period of time is called twilight, which ends around 8:30 p.m. this week.  For those with a sun dial, solar transit or local noon occurs around 1:12 p.m. this week. 

      

Day

Sunrise

Sunset

09 Mar

7:22 a.m.

7:02 p.m.

10 Mar

7:20 a.m.

7:03 p.m.

11 Mar

7:19 a.m.

7:04 p.m.

12 Mar

7:17 a.m.

7:05 p.m.

13 Mar

7:16 a.m.

7:06 p.m.

14 Mar

7:14 a.m.

7:07 p.m.

15 Mar

7:13 a.m.

7:08 p.m.

16 Mar

7:11 a.m.

7:09 p.m.

          

Moonrise for Monday, March 9 occurs at 10:53 p.m. and moonset will occur at 9:52 a.m. on the following day.  On Monday, March 9 the Moon will be exhibiting a waning gibbous phase with about 86% of the lunar disk illuminated.  Last quarter moon occurs on March 13.   

International Space Station (ISS) Observing 

Visible passes of ISS from St. Louis this week occur during the morning hours.  The best of these passes are on the mornings of March 12 and 14.  Use the table below for information on when and where to look for ISS this week. 

Catch ISS flying over St. Louis in the morning hours starting Monday, March 9.  

Date

Mag

Starts

Max. altitude

Ends

Time

Alt.

Az.

Time

Alt.

Az.

Time

Alt.

Az.

10 Mar

-1.7

06:09:45

10

SSW

06:12:38

31

SE

06:15:33

10

ENE

11 Mar

-0.8

05:19:19

15

SE

05:19:44

15

SE

05:21:47

10

E

12 Mar

-3.4

06:01:27

32

SW

06:02:48

83

SE

06:06:02

10

NE

13 Mar

-1.4

05:10:45

29

E

05:10:45

29

E

05:12:46

10

ENE

13 Mar

-1.9

06:43:31

10

W

06:46:14

24

NNW

06:48:56

10

NNE

14 Mar

-2.8

05:52:32

38

NW

05:52:57

40

NNW

05:56:01

10

NE

15 Mar

-1.0

05:01:34

23

NE

05:01:34

23

NE

05:02:57

10

NE

15 Mar

-1.1

06:34:34

10

WNW

06:36:34

15

NNW

06:38:31

10

NNE

16 Mar

-1.6

05:43:06

22

NNW

05:43:06

22

NNW

05:45:40

10

NNE

 

Magnitude (Mag): The Measure of brightness for a celestial object.  The lower the value is, the brighter the object will be. 

Altitude (Alt):  The angle of a celestial object measured upwards from the observer’s horizon. 

Azimuth (Az):  The direction of a celestial object, measured clockwise from an observer’s location with north being 0°, east being 90°, south being 180° and west being 270°. 

For information about ISS flyovers and other visible satellites, visit www.heavens-above.com 

Detailed information regarding all unmanned exploration of our universe, missions past, present, and planned, can be found at Jet Propulsion Laboratories:

http://www.jpl.nasa.gov/ 

The Planets Visible Without A Telescope

Venus

The second planet from the Sun is out of the glare of the Sun and will be visible shortly after sunset.  Venus will be seen about 20 minutes after sunset low in the southwest and will set by 9:34 p.m.  Venus will continue to climb above the western horizon until June 6 when it reaches maximum eastern elongation.  After this Venus will begin to head back into the glare of the Sun. 

Mars

Mars is now in the constellation Pisces and rises before the Sun sets.  Mars will be seen in the southwestern skies about 30 minutes after sunset.  Mars will set by 8:58 p.m.   

Jupiter

The largest planet in the solar system has returned to our evening skies.  Jupiter is now rising before the Sun sets and as such will be visible about 20 minutes after sunset in our eastern skies.  Jupiter is currently located in the constellation Cancer the Crab. 

If you keep track of Jupiter once a week through July you will notice what is called retrograde motion.  This is cause as we catch up with a planet in our orbit and then pass it by.  This will make the planet look like it stops and then moves in the opposite direction.  This is due to the changing angles we see Jupiter with respect to the background star field.  Jupiter right now is exhibiting a western motion and by July will have returned to its eastern motion.  This type of motion is what ancient astronomers noticed that lead them to name the planets Aster Planetes or wandering stars. 

Saturn

Saturn is now well out of the glare of the Sun but it remains an early morning object for the time being.  Saturn rises as 1:11 a.m. but you will have to wait until near 2:00 a.m. to get a decent view of the ringed planet.  Saturn will rise about 30 minutes earlier than it did the week before as it approaches opposition on May 22, 2015.   

Comet C/2014 Q2 Lovejoy

2015 is starting out great for comet observers.  The 4th comet discovered by amateur astronomy Terry Lovejoy is now well placed in the sky for northern hemisphere observers to see it during evening hours.  C/2014 Q2 Lovejoy is a long period comet that before it entered the planetary region took 11,000 years to orbit the Sun.  Due to the gravitational influence of the planets and the Sun once the comet is outbound it will have an orbital period of 8,000 years.  It is currently shining with an apparent magnitude of 6.0.  Comet C/2014 Q2 Lovejoy is now on its way out of the inner solar system and as such will begin to fade.  The comet has now faded to 6th magnitude which it will be difficult to see the comet with small binoculars from light polluted skies.  Larger aperture binoculars should still be good but soon the comet will fade too much even for these   

C/2014 Q2 Lovejoy is currently in the constellation Cassiopeia and will slowly move through the western edge of the constellation until April.  This week you will see C/2014 Q2 Lovejoy pass by the open star cluster called the ET Cluster or NGC 457.  If you would like to learn more about this comet and where you can find it visit http://www.skyandtelescope.com/astronomy-news/observing-news/spot-comet-lovejoy-tonight-122920141/ or visit

http://cometchasing.skyhound.com/comets/2014_Q2.pdf 

Messier Object of the Week

For the last few years the night sky update included a section that highlighted one constellation a month and a few objects of interest inside of it.  Unfortunately of the 88 constellations there are only about 60 we can see in St. Louis and of these there are only so many that have enough objects to reference that would interest both beginners and advanced observers.  So in 2015 we will change things a bit for this section and instead of highlighting one constellation for each month we will highlight one Messier object a week using the Astronomical League’s Binocular Messier program as our guide.  

The Astronomical League is an amateur astronomy society that is composed of over 240 local amateur astronomy societies across the United States and includes members at large and other supporting members.  Their goal is to promote the science of astronomy through education, incentive and communication.  

One of the many ways the Astronomical League has assisted amateur astronomers around the world is by creating various observing programs that highlight different aspects of astronomy and how an amateur astronomer can observe the sky and learn more about astronomy in doing so.  Some of these programs are introductory and are targeted at those beginning to learn about observational astronomy and some are extremely advanced, require specialized equipment and require a large amount of time to complete.  These observing programs cover most any type of object or way to observe the sky so everyone should be able to find one that matches their interests and abilities.  It is important to note that these programs are not part of any class or lecture series but are rather lists of objects that highlight types of objects or observing methods relevant to astronomy.  Taking part in these programs is done under one’s own choice.  To officially complete each program you do have to be a member of the Astronomical League but you do not have to join to use them as observing guides or education tools.  I would urge anyone interested in astronomy to look at these programs as they will help organize observing sessions and will help refine observing skills you already have.  You can find out more information about the Astronomical League’s observing programs here https://www.astroleague.org/observing.html 

The observing program we will use to help guide us through the 2015 observing year is the Binocular Messier Program.  This is a program that will appeal to both beginning and advance observers.  Too often it is thought that you need to have a telescope for astronomical observations.  Telescopes make great observing tools and yes they can show you more than binoculars but they do have their limitations.  Cost, size, weight and complexity will often be a surprise to people when they first learn about telescopes.  These factors can keep people from using telescopes they own or from buying one at all.  The best advice to follow is a good observing tool is one you will use.  

The binocular observing program is an introduction to the Messier catalog.  The Messier catalog was created by French astronomy Charles Messier.  He was a comet hunter that would periodically find objects that could be confused for comets.  To help others avoid these objects when looking for comets he created a list that consists of objects that today we know are star clusters, nebula and galaxies.  The Messier catalog is a great introduction to deep sky observing for northern hemisphere observers and as such it will be our guide for each week of 2015.  Each week we will highlight a Messier object that is part of the Astronomical League’s binocular Messier program.  I would urge each observer to fulfill the requirements of the program even if you do not intend to join the League for completion.  The requirements involve logging observing data that can help refine observing skills that will be useful later down the road.  If you have an interest in astronomy and learning more about observational astronomy I would also recommend checking out one of the two excellent astronomy societies near St. Louis.  Both are members of the Astronomical League and both do numerous public observing nights around town.  These clubs are the

St. Louis Astronomical Society and

Astronomical Society of Eastern Missouri

If you do not live in the St. Louis, Missouri area chances are you have similar astronomical societies where you live.  

The Messier object for the week of March 2 is the open star cluster Messier 44 (M44).  Like last month we are starting off with an easy target for all binoculars.  After observing and reading further on this week’s object you will quickly realize that a simple target can be quite rewarding.  M44 is a group of at least 350 stars that lie at a distance of 577 light years.  This group of young stars is estimated to be 730 million years old.  As would be expected of a cluster this old when its stars are plotted on an H-R Diagram it reveals mostly stars still on their main sequence with a few giant stars, a handful of stars transitioning to their giant phases and a few highly evolved white dwarf stars.  Star clusters like M44 are excellent targets for studying the life cycle of stars.  

M44 shines with an apparent magnitude of 3.7 making it visible to the unaided eye.  Due to this brightness M44 has been known about since ancient times.  When viewed with the naked eye M44 will look like a dim nebulous patch of light.  It was first resolved into individual stars by Galileo who could see a bit over 30 stars.  Today many of our binoculars are more powerful than the telescopes Galileo used so M44 will be a great target for binocular observers.  Using large telescopes nearly 200 of the estimated 350 component stars can be observed. 

Due to its age and proper motion it is believed that M44 may be related to another open star cluster called the Hyades.  With an estimated age of 790 million years and a similar direction of motion it is believed the M44 and the Hyades formed from the same large complex of dust and gas.  If you would like to see the Hyades look for the V-shape of stars near M45 in Taurus the Bull.     

M44 also contains a number of interesting stars.  There are a few stars that contain planetary disks likely indicating planet formation.  There are a few stars that have been discovered to already have planets.  Also of interest might be the eclipsing binary star TX Cancri and the star Epsilon Cancri for its unique spectrum.  The later of these will be more of interest to those that have access to a low resolution spectroscope.  

To find M44 you need to locate the constellation Cancer the Crab.  Cancer will appear as an upside down Y-shape that can be seen in the eastern sky after sunset.  The trouble with the constellation Cancer is most of its stars are no brighter than 4th magnitude.  This means if you observe in light polluted conditions this will be a difficult constellation to see.  The trick to finding the constellation Cancer is to first locate the constellations Gemini and Leo.  These are much brighter and are easily identified by their shapes.  Gemini is a large rectangle above the constellation Orion and Leo has a bright backwards question mark shape just below the Big Dipper.  Once you can find these look between them and there is a relatively sparse patch of sky which is the constellation Cancer.  Once in the vicinity look near the mid-section of this sparse patch of sky and there will be a dim patch of light.  This is the open star cluster M44.  Another way to find M44 is to locate the bright stars Castor and Pollux in Gemini and Regulus in Leo.  About halfway between these stars is where you will find M44.  A third way to find M44 is by locating the planet Jupiter.  Jupiter is currently in the constellation Cancer and if you can spot this planet M44 will be about one binocular field to the right.  Keep in mind that this trick will only work for a short time as Jupiter will leave the constellation Cancer by July of 2015.  Use the maps below and you should have no problem finding M44.

http://www.iau.org/static/public/constellations/gif/CNC.gif

http://www.iau.org/static/public/constellations/gif/LEO.gif

http://www.iau.org/static/public/constellations/gif/GEM.gif 

The Messier object for the week of March 9 is the open star cluster Messier 67 (M67).  Like last week’s object M67 is an open star cluster that is found within the Milky Way galaxy.  Lying at a distance of about 2,700 light years M67 shines with an apparent magnitude of 6.1.  At this magnitude M67 will be considerably dimmer then last week’s star cluster M44.  At 6.1 magnitude M67 will still be an easy target through binoculars however due to light pollution it will not be quite as obvious and may take a bit longer to find.  

M67 is estimated to have at least 500 stars of which nearly 100 of them are similar to the Sun.  The Trumpler Classification for M67 is II, 2, r meaning it is detached form background stars exhibiting a slight concentration of stars, its stars have a moderate range in brightness and it is a rich star cluster.  All of this information seems similar to other open star clusters covered so far however M67 is not like the others.  What makes M67 different is its age.  Most open star clusters will last for a few hundred million years.  Eventually gravitational interactions inside and outside of these open star clusters will cause the star cluster to break apart.  M67 is estimated to have an age between 3.2 billion to 5 billion years making it one of the oldest open star clusters in the Milky Way galaxy that we know of.  Astronomical modeling suggests that only the most massive of these open star clusters will last this long and some estimates suggest that M67 has lost about 90% of its mass due to mass loss and member stars escaping.  

M67 will be simple to find if you located last week’s star cluster M44.  M67 is also located in the constellation Cancer the Crab and can be found about 10 degrees south of M44.  If you have trouble locating M67 another point of reference is the star Alpha Cancri.  The constellation Cancer looks like an upside down Y-shape of stars.  Alpha Cancri represents the eastern branch of the Y-shape.  M67 can be found about 2 degrees west of this star.  Use the map below to help find M67 and remember the first step to finding the constellation Cancer is to first locate the constellations Leo and Gemini.  Between these two bright constellations is a dim patch of sky which is where you should start looking for the upside down Y-shape of the constellation Cancer. 

http://www.iau.org/static/public/constellations/gif/CNC.gif   

Our next Star Party will be held on Friday, April 3, 2015, from dusk until 10 p.m. 

Weather permitting, the St. Louis Astronomical Society and the Science Center will set up a number of telescopes outdoors and be on-hand to answer your questions.  Telescope viewing begins at 7 p.m.  Regardless of the weather on April 3, join us indoors in our planetarium theater for “The Sky Tonight”.  Showtime is at 7 p.m. 

This free, indoor star program will introduce you to the current night sky, the planets, and the seasonal constellations. Doors open 15 minutes before show time. Shows begins at 7 p.m. Sorry, no late admissions due to safety issues in the darkened theater. 

The St. Louis Astronomical Society helps host the monthly Star Parties at the Saint Louis Science Center which are held on the first Friday of each month. Our Monthly Star Parties are open to the public and free of charge.  For more information about the St. Louis Astronomical Society visit their website at www.slasonline.org

Come play in Discovery Room!

 If you’ve been to the Saint Louis Science Center since late December, you may have already seen the new Discovery Room. Everything Members love about the Discovery Room is still here – 45 minute sessions with fun, stimulating activities open to everyone, but geared for children ages 1-8. Members still get free tickets, even as the non-Member price increases to $4 per person, ages 1 and up, making your Membership an even greater value! 

Along with a new entrance and separate exit to help traffic flow, the interior of the Discovery Room is largely divided into three main learning areas – water, nature and sky – all creating unique and fun exploration and making opportunities. Apart from the new aquarium, everything new was conceptualized, designed, built and painted by the Saint Louis Science Center’s own Production, Electronics and Design teams in collaboration with Science Center Educators. The new activities incorporate best practices in early childhood education. 

“We are so happy to bring all these new immersive environments to our Members and visitors,” said Melissa Thomas, Senior Educator for the Discovery Room. “Children and their families will really be able to let their minds and spirts grow and learn as they play in new, creative ways. I’m especially excited about the weekly activities that will be led by our staff.” 

In addition to the three new experience sections, under the red pteranodon in the middle of room, staff-facilitated activities will change every week. They’ll last about 15-20 minutes, and you can choose to participate or keep playing on your own. 

Water 

The water section houses the aquatic amphibian, an axolotl, and the long-time favorite water table. Enjoy a brand new 270 gallon saltwater aquarium with a raised platform for 360° viewing. You can use large blue foam building blocks from Imagination Playground to make anything from a robot to a castle. The only limitations are within your imagination! 

Nature 

Climb inside a giant hollow log tree where the much beloved, or despised depending on your personal preference, Madagascar hissing cockroaches and rainforest cockroaches reside. A new MicroEye microscope allows you to examine 3D objects closely on a large screen. 

Play-act in the new shadow theater using six, one-size-fits-all animal costumes that will change periodically with the seasons. Currently all the costumes are animals that can be found in the winter Midwest – squirrel, rabbit, opossum, raccoon and a male and female cardinal. 

Sky 

The most prominent new feature is the two-story rocket, complete with an emergency escape slide and interactive computer control panels that allow you to communicate via a NASA inspired CapCom station. Children can learn basic engineering concepts of space and space flight. Create constellations, real or imagined, in the star room and launch a shuttle from Earth to a moonscape table. A solar system mural takes up the entire back wall, along with a projection of the moon that updates daily with the current moon phases. 

As previously mentioned, Members receive a certain number of free tickets based on their Membership level, but anyone can also reserve the entire Discovery Room for $120 per session. Groups of ten or more can purchase tickets for $3 each. All group reservations must be made at least two weeks in advance. Call Advance Sales & Group Reservations at 314.289.4424 to reserve your tickets today!

Yes Teens Compete at Brain Bee!

"The YES teens in the Neuroscience component competed in the St. Louis Area Brain Bee held at Washington University this past weekend.  This is like a spelling bee, except teens are asked neuroscience questions!  These questions come from the Brain Facts book, produced by the Society for Neuroscience. The winner of this regional competition goes on to the national Brain Bee competition.  The teens that made it to the top 10 scored better than many undergraduate neuroscience majors! This is a major accomplishment and two of the YES teens made it to the top 10! 
 
 
2nd place-- Antoine Watkins
8th place-- William Aldrich 
 
Congratulations to Antoine and William!!!"
 
To learn more about the Science Center's YES program click here.

Week of Monday, February 2

This is the Saint Louis Science Center’s NIGHT SKY UPDATE for the week of Monday, February 2.  All times are given as local St. Louis time (Central Standard Time).  For definitions of terminology used in the night sky update, click the highlighted text. 

Information updated weekly or as needed. 

Join us for our next star party, Friday, February 6, 2015 held in association with the St. Louis Astronomical Society.  For details, see the information at the bottom of this page. 

The Sun and the Moon 

Sunrise is at 7:06 a.m. on Monday, February 2 and sunset is at 5:24 p.m. providing us with over 10 hours of daylight.  Even after sunset, the light from the Sun will still dimly illuminate our sky for about 1.5 hours.  This period of time is called twilight, which ends around 6:55 p.m. this week.  For those with a sun dial, solar transit or local noon occurs around 12:15 p.m. this week.       

Day

Sunrise

Sunset

02 Feb

7:06 a.m.

5:24 p.m.

03 Feb

7:05 a.m.

5:25 p.m.

04 Feb

7:04 a.m.

5:26 p.m.

05 Feb

7:03 a.m.

5:27 p.m.

06 Feb

7:02 a.m.

5:28 p.m.

07 Feb

7:01 a.m.

5:30 p.m.

08 Feb

7:00 a.m.

5:31 p.m.

09 Feb

6:59 a.m.

5:32 p.m.

          

Moonrise for Monday, February 2 occurs at 4:35 p.m. and moonset will occur at 6:34 a.m. on the following day.  On Monday, February 2 the Moon will be exhibiting a waxing gibbous phase with about 98% of the lunar disk illuminated.  The next full moon occurs on February 3.   

International Space Station (ISS) Observing 

Visible passes of ISS from St. Louis this week occur during the evening hours.  The best of these is on the evenings of February 4 and 7.  Learn more about these passes and others this week in the table below. 

Catch ISS flying over St. Louis in the evening hours starting Monday, February 2.  

Date

Mag

Starts

Max. altitude

Ends

Time

Alt.

Az.

Time

Alt.

Az.

Time

Alt.

Az.

02 Feb

-1.0

19:12:17

10

SSW

19:13:11

16

S

19:13:11

16

S

03 Feb

-1.3

18:21:04

10

SSE

18:22:55

15

SE

18:23:34

14

ESE

04 Feb

-3.4

19:03:27

10

SW

19:06:30

73

S

19:06:30

73

S

05 Feb

-2.5

18:11:20

10

SSW

18:14:20

36

SE

18:16:39

15

ENE

05 Feb

-0.5

19:48:05

10

W

19:49:19

18

WNW

19:49:19

18

WNW

06 Feb

-2.4

18:55:11

10

WSW

18:58:18

42

NNW

18:59:20

31

NNE

07 Feb

-3.3

18:02:32

10

SW

18:05:47

83

NW

18:09:03

10

NE

07 Feb

-0.5

19:40:38

10

WNW

19:41:54

14

NW

19:41:54

14

NW

08 Feb

-1.3

18:47:19

10

W

18:49:56

22

NNW

18:51:43

15

NNE

09 Feb

-2.0

17:54:13

10

W

17:57:15

35

NNW

18:00:17

10

NE

 

Magnitude (Mag): The Measure of brightness for a celestial object.  The lower the value is, the brighter the object will be. 

Altitude (Alt):  The angle of a celestial object measured upwards from the observer’s horizon. 

Azimuth (Az):  The direction of a celestial object, measured clockwise from an observer’s location with north being 0°, east being 90°, south being 180° and west being 270°.  

For information about ISS flyovers and other visible satellites, visit www.heavens-above.com 

Detailed information regarding all unmanned exploration of our universe, missions past, present, and planned, can be found at Jet Propulsion Laboratories:

http://www.jpl.nasa.gov/ 

The Planets Visible Without A Telescope

Venus

The second planet from the Sun is out of the glare of the Sun and will be visible shortly after sunset.  Venus will be seen about 20 minutes after sunset low in the southwest and will set by 7:17 p.m.  Venus will continue to climb above the western horizon until June 6 when it reaches maximum eastern elongation.  After this Venus will begin to head back into the glare of the Sun. 

Mars

Mars is now in the constellation Aquarius and rises before the Sun sets.  Mars will be seen in the southwestern skies about 30 minutes after sunset.  Mars will set by 8:02 p.m.  

Jupiter

The largest planet in the solar system has returned to our evening skies.  Jupiter can be found rising by 5:38 p.m. and will be easily visible by 6:30 p.m. in the eastern sky.  Jupiter can currently be found in the constellation Leo the Lion.  Jupiter will be at opposition on February 6, 2015.  On this day Jupiter will rise as the Sun sets and the giant planet will be at its brightest.     

Comet C/2014 Q2 Lovejoy

2015 is starting out great for comet observers.  The 5th comet discovered by amateur astronomy Terry Lovejoy is now well placed in the sky for northern hemisphere observers to see it most of the night.  C/2014 Q2 Lovejoy is a long period comet that before it entered the planetary region took 11,000 years to orbit the Sun.  Due to the gravitational influence of the planets and the Sun once the comet is outbound it will have an orbital period of 8,000 years.  It is currently shining with an apparent magnitude of 5.0.  Comet C/2014 Q2 Lovejoy is now on its way out of the inner solar system and as such will begin to fade. 

C/2014 Q2 Lovejoy is currently in the constellation Andromeda and will slowly move through the western edge of the constellation until February 19.  If you would like to learn more about this comet and where you can find it visit http://www.skyandtelescope.com/astronomy-news/observing-news/spot-comet-lovejoy-tonight-122920141/ 

Messier Object of the Week

For the last few years the night sky update included a section that highlighted one constellation a month and a few objects of interest inside of it.  Unfortunately of the 88 constellations there are only about 60 we can see in St. Louis and of these there are only so many that have enough objects to reference that would interest both beginners and advanced observers.  So in 2015 we will change things a bit for this section and instead of highlighting one constellation for each month we will highlight one Messier object a week using the Astronomical League’s Binocular Messier program as our guide.  

The Astronomical League is an amateur astronomy society that is composed of over 240 local amateur astronomy societies across the United States and includes members at large and other supporting members.  Their goal is to promote the science of astronomy through education, incentive and communication.  

One of the many ways the Astronomical League has assisted amateur astronomers around the world is by creating various observing programs that highlight different aspects of astronomy and how an amateur astronomer can observe the sky and learn more about astronomy in doing so.  Some of these programs are introductory and are targeted at those beginning to learn about observational astronomy and some are extremely advanced, require specialized equipment and require a large amount of time to complete.  These observing programs cover most any type of object or way to observe the sky so everyone should be able to find one that matches their interests and abilities.  It is important to note that these programs are not part of any class or lecture series but are rather lists of objects that highlight types of objects or observing methods relevant to astronomy.  Taking part in these programs is done under one’s own choice.  To officially complete each program you do have to be a member of the Astronomical League but you do not have to join to use them as observing guides or education tools.  I would urge anyone interested in astronomy to look at these programs as they will help organize observing sessions and will help refine observing skills you already have.  You can find out more information about the Astronomical League’s observing programs here https://www.astroleague.org/observing.html 

The observing program we will use to help guide us through the 2015 observing year is the Binocular Messier Program.  This is a program that will appeal to both beginning and advance observers.  Too often it is thought that you need to have a telescope for astronomical observations.  Telescopes make great observing tools and yes they can show you more than binoculars but they do have their limitations.  Cost, size, weight and complexity will often be a surprise to people when they first learn about telescopes.  These factors can keep people from using telescopes they own or from buying one at all.  The best advice to follow is a good observing tool is one you will use.  

The binocular observing program is an introduction to the Messier catalog.  The Messier catalog was created by French astronomy Charles Messier.  He was a comet hunter that would periodically find objects that could be confused for comets.  To help others avoid these objects when looking for comets he created a list that consists of objects that today we know are star clusters, nebula and galaxies.  The Messier catalog is a great introduction to deep sky observing for northern hemisphere observers and as such it will be our guide for each week of 2015.  Each week we will highlight a Messier object that is part of the Astronomical League’s binocular Messier program.  I would urge each observer to fulfill the requirements of the program even if you do not intend to join the League for completion.  The requirements involve logging observing data that can help refine observing skills that will be useful later down the road.  If you have an interest in astronomy and learning more about observational astronomy I would also recommend checking out one of the two excellent astronomy societies near St. Louis.  Both are members of the Astronomical League and both do numerous public observing nights around town.  These clubs are the

St. Louis Astronomical Society and

Astronomical Society of Eastern Missouri

If you do not live in the St. Louis, Missouri area chances are you have similar astronomical societies where you live.  

The Messier object for the week of February 2 is the open star cluster Messier 45 (M45).  If there is one star cluster that is preferred over all others M45 would likely be the one that many observers would list.  It is bright enough to be seen with the naked eye, individual stars are resolvable through the smallest aperture instruments and due to its close proximity to our solar system it has a wealth of details and information that make it valuable to both professional and amateur astronomers.  

M45 is visible around the world as it is near the plane of the ecliptic.  This is the same path that the planets Sun and Moon appear to follow.  Due to its visibility to people around the world there are numerous names M45 is known by.  A sample of these is the Pleiades, Seven Sisters, Wolf Pack, Subaru and the Six Nurses.  There many more names and exploring these may be a source of enjoyment for some to track down these names and the cultures that created them.     

M45 is a young open star cluster that formed about 100 million years ago.  Like all open star clusters M45’s component stars are gravitationally bound but this relationship is doomed to end.  Due to tidal forces in open star clusters and outside gravitational influences open star clusters will eventually tear themselves apart.  Open star clusters are the product of star formation so all the individual stars you see in the sky, including the Sun, were at one time in a similar star cluster. 

At a distance of 440 light years this young group of stars shines with an apparent magnitude of 1.6 magnitude putting it well within naked eye visibility.  Due to its bright magnitude it is one of the easiest and most observed deep sky objects.  With the naked eye most will be able to count 5 to 7 individual stars.  Through binoculars and telescopes that number goes up to about 100 stars.  Using advanced observing techniques astronomers have identified about 500 stars with optical light and nearly 1,400 stars using infrared telescopes.  

Due to its proximity to our solar system M45 covers about 115 arc minutes of sky and to see it all in one view low magnifications are required and as such binoculars are well suited for this.  As you observer M45 you will first see the brightest component stars that form a small spoon shape.  This shape causes many to misidentify this star cluster as the Littler Dipper.  Continuing to observe M45 dimmer stars will be seen some of which will form long chains of stars.  

Also of interest are variable and double stars within M45.  To begin to observe and identify these features you will need to locate a map of M45.  One example of a variable star in M45 is the Pleione.  This is a binary star system in which the main component star is of the B spectral class that exhibits additional spectral emissions making it a Be-class star.  The reason for the extra spectral emissions is how fast the main component star rotates.  For a star of its size it rotates near its break up velocity.  The star’s high rotational velocity of one rotation every 11.8 hours causes material to be spun off that forms into a circumstellar disk.  Being close enough to this hot B-class star causes the circumstellar disk to be excited and in turn emit light.  The variability of these stars is linked to the circumstellar disk and when it is excited into emitting light.  Due to these variations Pleione exhibits brightness variations every 35 years identified by spectral class changes.  Variable stars like Pleione are not the best variables to start with but they are worth keeping an eye on over the years.   

Another interesting feature of M45 is a star named HD 23514.  This star is about 9th magnitude and can be seen in large aperture binoculars.  This is a sun like star that displays an interesting signature when observed in infrared.  Using Infrared telescopes HD 23514 is seen to be surrounded by a large amount of hot dust.  Analyzing the heat from the dust particles suggest that they are the product of collisions between materials in a terrestrial planet zone extending through an area of about 2 au from the star.  What astronomers are likely looking at is material orbiting a young star that is in the process of forming into planets.  For more information regarding this interesting star visit http://www.gemini.edu/index.php?q=node/259 

To find M45 you will need to locate the constellation Taurus the Bull. This is easily done by locating Orion the Hunter and following his three belt stars to the northwest.  Doing this you will first find the bright red star Aldebaran which marks the angry eye of Taurus.  Keep following the same path and you will quickly find what first looks like a dim patch of light but when viewed through binoculars will clearly be a spoon shaped group of stars which is M45.  This week’s Messier object is simple to find but will remain a source of enjoyment for all and can offer even the most experienced observer a challenge due to the complexity of the cluster and its components.  For help in tracking down this bright star cluster use the map below.

http://www.iau.org/static/public/constellations/gif/TAU.gif  

Our next Star Party will be held on Friday, February 6, 2015, from dusk until 10 p.m. 

Weather permitting, the St. Louis Astronomical Society and the Science Center will set up a number of telescopes outdoors and be on-hand to answer your questions.  Telescope viewing begins at 7 p.m.  Regardless of the weather on February 6, join us indoors in our planetarium theater for “The Sky Tonight”.  Showtime is at 7 p.m. 

This free, indoor star program will introduce you to the current night sky, the planets, and the seasonal constellations. Doors open 15 minutes before show time. Shows begins at 7 p.m. Sorry, no late admissions due to safety issues in the darkened theater. 

The St. Louis Astronomical Society hosts the monthly Star Parties at the Science Center which are held on the first Friday of each month. Our Monthly Star Parties are open to the public and free of charge.  For more information about the St. Louis Astronomical Society visit their website at www.slasonline.org

Week of Monday, November 17

This is the Saint Louis Science Center’s NIGHT SKY UPDATE for the week of Monday, November 17.  All times are given as local St. Louis time (Central Standard Time).  For definitions of terminology used in the night sky update, click the highlighted text.

Information updated weekly or as needed.

Join us for our next star party, Friday, December 5, 2014 held in association with the St. Louis Astronomical Society. For details, see the information at the bottom of this page.

The Sun and the Moon

Sunrise is at 6:45 a.m. on Monday, November 17 and sunset is at 4:46 p.m. providing us with about 10 hours of daylight.  Even after sunset, the light from the Sun will still dimly illuminate our sky for about 1.5 hours.  This period of time is called twilight, which ends around 6:18 p.m. this week.  For those with a sun dial, solar transit or local noon occurs around 11:46 a.m. this week. 

 

Day

Sunrise

Sunset

10 Nov

6:45 a.m.

4:46 p.m.

11 Nov

6:46 a.m.

4:46 p.m.

12 Nov

6:47 a.m.

4:45 p.m.

13 Nov

6:49 a.m.

4:44 p.m.

14 Nov

6:50 a.m.

4:44 p.m.

15 Nov

6:51 a.m.

4:43 p.m.

16 Nov

6:52 a.m.

4:43 p.m.

         

Moonrise for Monday, November 17 occurs at 1:50 a.m. and moonset will occur at 2:07 p.m.  On Monday, November 17 the Moon will be exhibiting a waning crescent phase with about 22% of the lunar disk illuminated.  New moon occurs on November 22 at 6:33 a.m.  

International Space Station (ISS) Observing

Visible passes of ISS from St. Louis this week occur during the morning hours.  The best of these is on the morning of November 23.  Learn more about this pass and other this week in the table below.

Catch ISS flying over St. Louis in the morning hours starting Monday, November 17. 

Date

Mag

Starts

Max. altitude

Ends

Time

Alt.

Az.

Time

Alt.

Az.

Time

Alt.

Az.

21 Nov

-0.8

05:55:54

10

N

05:57:26

13

NNE

05:58:59

10

NE

23 Nov

-1.2

05:52:45

10

NNW

05:55:19

20

NNE

05:57:52

10

ENE

24 Nov

-0.9

05:05:07

15

NNE

05:05:27

15

NNE

05:07:27

10

ENE

 

Magnitude (Mag): The Measure of brightness for a celestial object.  The lower the value is, the brighter the object will be.

Altitude (Alt):  The angle of a celestial object measured upwards from the observer’s horizon.

Azimuth (Az):  The direction of a celestial object, measured clockwise from an observer’s location with north being 0°, east being 90°, south being 180° and west being 270°. 

For information about ISS flyovers and other visible satellites, visit www.heavens-above.com

Detailed information regarding all unmanned exploration of our universe, missions past, present, and planned, can be found at Jet Propulsion Laboratories:

http://www.jpl.nasa.gov/

The Planets Visible Without A Telescope

Mercury

The most elusive naked eye planet has returned to the morning skies just before sunrise.  It will be difficult to see unless you find a clear eastern horizon free of trees and buildings.  If you have any kind of tree cover east of you Mercury will be too low in the sky.  This will be the best morning apparition of Mercury this year and will get better as the month goes on.

Mars

Mars is now in the constellation Sagittarius and rises before the Sun sets.  Mars will be seen in the southwestern skies about 20 minutes after sunset.  Mars will set by 8:04 p.m. 

Jupiter

The largest planet in the solar system has returned to our evening skies.  Jupiter can be found rising by 11:00 p.m. and will be easily visible by 11:30 p.m. in the eastern sky.  Jupiter can currently be found in the constellation Leo the Lion.    

Uranus and Neptune Opposition 2014

The two most distant planets in our solar system will be at their best for the next couple of months.  Neptune has already reached opposition and Uranus will reach opposition on October 7, 2014.  The opposition of a planet is when it is in opposition with the Sun.  What that means is a planet or other body such as an asteroid is seen on the opposite side of the Earth than the Sun is.  From our perspective this is when an object is at its brightest and also coincides with the object’s closest approach to the Earth.  Only objects further from the Sun than we are can be in opposition. 

Of the two planets Uranus will be the brightest.  Uranus is already appearing as a 5.8 magnitude object and will continue to brighten until October 7.  Uranus is normally a planet that requires binoculars to be seen but when the planet is nearing opposition dark sky observers can see it with the unaided eye.  Through telescopes observers will resolve Uranus into a small disk shaped object that may display a slight greenish blue color.  Large telescopes using high magnifications up to 300x might be able to discern dark and light patches called albedo features.  These features require large aperture telescopes and better than average viewing conditions to be seen. 

Uranus is currently in the constellation Pisces.  Pisces is very difficult to see in light polluted skies so it is better to start with the Great Square of Autumn.  This asterism connects the constellations Andromeda and Pegasus all of which will be seen high in the eastern sky by 10:00 p.m.  As the Great Square sits high in the east if you follow a line connecting the stars Scheat (Beta Peg) through Algenib (Gamma Peg) about the same distance that lays between the two stars you will find three stars the stand next to one another in a straight line.  The brightest of these stars is Delta Piscium.  Uranus is about four degrees south of these stars.  You will need either a desktop planetarium program or detailed star chart to help you pinpoint which star like object is Uranus. 

http://www.iau.org/static/public/constellations/gif/PSC.gif

http://www.iau.org/static/public/constellations/gif/PEG.gif

http://www.skyandtelescope.com/astronomy-news/observing-news/uranus-and-neptune-in-2014/

Neptune reached opposition on August 29, 2014.  It is now at its peak brightness of 7.8 magnitude.  This means that you will need at least binoculars to see this distant planet even when it is at its brightest.  Through binoculars Neptune will appear as a dim star like object in the constellation Aquarius.  To find Neptune first locate the bright star Fomalhaut.  About 6 to 10 degrees north of Fomalhaut you will find six bright stars that are shaped like a hyperboloid.  Scanning the sky further north you will find the star Sigma Aquarii.  Neptune will be just east of this star.      

Using a telescope most will see a star like object that when magnified enough will reveal a greyish blue disk.  Using a large telescope and high magnification up to 300x it may be possible to detect albedo features and Neptune largest moon Triton.  Triton will appear as a dim star right next to Neptune.

Like Uranus Neptune will require some kind of astronomy software of a detailed map to find.  As we pass by these planets in our orbit see if you can detect there shift amongst the background stars.  Below are a few links that will be helpful in locating Neptune and the stars mentioned above.

http://www.iau.org/static/public/constellations/gif/AQR.gif

http://www.skyandtelescope.com/astronomy-news/observing-news/uranus-and-neptune-in-2014/

Constellation of the Month

Each month we will highlight one constellation and some of the objects that can be found within the boundaries of that constellation.  At the start of the month we will list only a few of these objects and each week we will add another to the list.  Some objects will be visible to the unaided eye and some may require a telescope.  Many of the objects listed will require a map of the sky to find or may require repeat observations to notice various properties.  Links to star charts and other information that will be useful in identifying the objects listed will be given at the end of each week’s section. 

This month we will explore the constellation Pegasus.  Pegasus is the famous flying horse that appears in the story of Perseus.  Pegasus was the offspring of Poseidon and Medusa who was born to the world once Medusa was slain in battle by Perseus.  Pegasus is said to have aided Perseus in his fight against the Titan Cetus and also was eventually awarded a place in the stables of Mt. Olympus tasked with caring the lightning bolts of Zeus. 

To find Pegasus first locate the Great Square of Autumn from our list of asterisms we covered last month.  The Great Square connects the constellations Andromeda to Pegasus and will be best seen nearly over head after 10 p.m. 

http://www.iau.org/static/public/constellations/gif/PEG.gif

As for the individual objects we will cover this month Pegasus can be seen as a bit sparse for the beginning observer.  Pegasus has many fine targets to look for however they are a little more on the advanced end of the observing challenges.  All the targets we will talk about this month can be seen in binoculars of varying apertures however they will require the ability to recognize faint and complex star fields to confirm that the object was seen.  Even though I would describe these as advanced observing projects that does not mean the beginning observer cannot find them.  In fact these objects will help push your observing abilities and help refine your observing skills. 

The first object we will cover in November is the globular cluster Messier 15.  This will be the only easy object to find that we cover this month in the night sky update.  Messier 15 is one of the roughly 160 globular clusters found in the Milky Way Galaxy.  Globular clusters are the densely packed ancient star clusters that orbit the outer halo and center of our galaxy.  Messier 15 contains over 100,000 stars that lie at a distance of about 33,000 light years. 

Also of interest is that Messier 15 is one of the prototype globular clusters that exhibit something called core collapse.  The core collapse of a globular cluster is the result of how its stars orbit within the cluster and interact with one another.  Due to a transfer of energy, stars near the core begin to migrate further into the core while the stars associated with the cluster’s halo migrate further out.  The star populations in the core of globular clusters that exhibit core collapse are nearly ten billion times more densely packed than that of the Sun’s neighborhood in the Milky Way.  Visually what that means is the globular cluster will have increasing magnitudes as you look from its edge to its core. 

To find Messier 15 first locate the Great Square of Autumn.  The southwestern most star in the square is called Markab.  From this star if you continue scanning southwest you will find the stars Homan and Theta Pegasi.  From Theta Pegasi look about 7 degrees to the northwest and you will find the star Enif.  Continuing along this same path you will find Messier 15 about 2 to 3 degrees to the northwest of Enif.  It will appear as a fuzzy star.  It is listed at about 6.2 magnitude and will appear to cover about 7 arc minutes of sky.  Due to the core collapse aspect of this globular many of its member stars cover an area of about 21 arc minutes but will remain unseen due to their great distance from us. 

http://www.iau.org/static/public/constellations/gif/PEG.gif 

The object for the week of November 10 is the star 51 Pegasi.  At first glance this is a star that would not seem to warrant a lot of attention.  It is a G-class dwarf star that is similar in size to the Sun (a bit bigger).  It is a main sequence star that is fusing hydrogen at its core; it has a high metallicity and would be considered middle aged for its temperature and mass.  In all 51 Pegasi is very similar to the Sun.  All of these traits that may seem to make 51 Pegasi appear as an average generic star are what makes 51 Pegasi an ideal candidate for a star that has planets.  In 1995 this idea was confirmed when scientists using an observational method called radial velocity discovered a Jupiter size body orbiting the star. 

The potential exoplanet orbiting 51 Pegasi has been formally named 51 Pegasi b with some calling it Bellerophon, who was the ancient Greek hero who slew the Chimera with the assistance of Pegasus.  This was the first exoplanet discovered orbiting a main sequence star.  51 Peg b is a body that orbits 51 Pegasi at a distance of roughly 0.05 AU (4.65 million miles).  It is tidally locked which means the same side of the body is always pointed at the star.  Due to this the side that is pointed at the star would have temperatures reaching 1,800 degrees Fahrenheit. 

There has been some thought that 51 Peg b is a brown dwarf star.  This would suggest that 51 Pegasi is a binary star system.  The reason for this is at the time of 51 Peg b’s discovery a Jupiter sized body forming so close to its parent star seemed highly unlikely.  Since the discovery of 51 Peg b a number of other Jupiter sized planets have been discovered orbiting their stars at similar close distances.  These exoplanets have been called Hot Jupiters.  Most view 51 Peg b as an exoplanet however there is still some debate on the issue.

To find 51 Pegasi first locate the Great Square of Autumn.  Next locate the two stars that make up the western half of the square, Alpha and Beta Pegasi.  About halfway between these two stars there will be two 5th magnitude stars.  The western of these is 51 Pegasi.  The map I will link below shows 51 Pegasi but it does not label it.  So for confirmation you will need to locate a more detailed map of the sky or use planetarium software such as Stellarium.  This software is free to download and is an extremely useful tool for the backyard stargazer. 

http://www.iau.org/static/public/constellations/gif/PEG.gif

The object for the week of November 17 is the supergiant star Enif.  Also known as Epsilon Pegasi this K-class star (orange) is the brightest star in Pegasus.  Enif marks the nose of Pegasus and is one of the guide stars we used to find Messier 15 earlier this month.  Enif is of interest for a number of reasons.  First it is a highly evolved star that is in its supergiant phase.  It is likely beginning to fuse helium into carbon and oxygen and may move on to heavier elements on its way to an explosive death called a supernova.  Enif will likely exist for another few million years before it explodes or becomes a rare oxygen and neon white dwarf star.   

Another reason Enif is of interest is because it is a variable star.  Unlike other variable stars covered in the night sky update, Enif is a variable that does not have a predictable period of variance.  Enif is what has been called a slow LC irregular variable star.  On a few rare occasions Enif has been seen to brighten by about 2 magnitudes for a short period of time (minutes).  These types of variable stars are not well understood due to their variable nature being unpredictable and are very difficult to catch.  It is believed that stars like this have similar flare events as the Sun exhibits only on a much larger scale.  The cause of these enormous flares is not understood and it goes to show that astronomers still have a lot to learn about how stars behave.  If you have an interest in observing this rare variable star it will take dedication and patience and perhaps even a journey into the world of video astronomy.  Video ccd cameras allow an observer to document large periods of time.  Video astronomy also has the benefit of costing far less than a traditional still or FITS ccd camera that many astrophotographers would use.     

To find Enif first locate the Great Square of Autumn.  From the lower right corner of the square look for the bright stars Zeta and Theta Pegasi.  These two stars form the neck of Pegasus and will extend to the southwest in a long straight line.  From Theta Pegasi look to the northwest and you will find Enif.  This star will not be a normal target for many observers however keeping it in mind while you are observing during the fall and winter months may provide you with an exciting opportunity to see a truly rare sight in the sky.  Use the map linked below to help you find Enif and the guide stars listed above. 

http://www.iau.org/static/public/constellations/gif/PEG.gif       

Our next Star Party will be held on Friday, December 5, 2014, from dusk until 10 p.m.

Weather permitting, the St. Louis Astronomical Society and the Science Center will set up a number of telescopes outdoors and be on-hand to answer your questions.  Telescope viewing begins at 8:00 p.m.  Regardless of the weather on December 5, join us indoors in our planetarium theater for “The Sky Tonight”.  Showtime is at 7 p.m.
This free, indoor star program will introduce you to the current night sky, the planets, and the seasonal constellations. Doors open 15 minutes before show time. Shows begins at 7 p.m. Sorry, no late admissions due to safety issues in the darkened theater.

The St. Louis Astronomical Society hosts the monthly Star Parties at the Science Center which are held on the first Friday of each month. Our Monthly Star Parties are open to the public and free of charge.  For more information about the St. Louis Astronomical Society visit their website at www.slasonline.org

Week of Monday, November 10

This is the Saint Louis Science Center’s NIGHT SKY UPDATE for the week of Monday, November 10.  All times are given as local St. Louis time (Central Standard Time).  For definitions of terminology used in the night sky update, click the highlighted text.

Information updated weekly or as needed.

Join us for our next star party, Friday, December 5, 2014 held in association with the St. Louis Astronomical Society. For details, see the information at the bottom of this page.

The Sun and the Moon

Sunrise is at 6:38 a.m. on Monday, November 10 and sunset is at 4:52 p.m. providing us with about 10.5 hours of daylight.  Even after sunset, the light from the Sun will still dimly illuminate our sky for about 1.5 hours.  This period of time is called twilight, which ends around 6:23 p.m. this week.  For those with a sun dial, solar transit or local noon occurs around 11:45 a.m. this week.  

Day

Sunrise

Sunset

10 Nov

6:38 a.m.

4:52 p.m.

11 Nov

6:39 a.m.

4:51 p.m.

12 Nov

6:40 a.m.

4:50 p.m.

13 Nov

6:41 a.m.

4:49 p.m.

14 Nov

6:42 a.m.

4:49 p.m.

15 Nov

6:43 a.m.

4:48 p.m.

16 Nov

6:44 a.m.

4:47 p.m.

        

Moonrise for Monday, November 10 occurs at 8:20 p.m. and moonset will occur at 10:45 a.m. on the following day.  On Monday, November 10 the Moon will be exhibiting a waning gibbous phase with about 84% of the lunar disk illuminated.  Last quarter moon occurs on November 14 at 9:17 a.m.  

International Space Station (ISS) Observing

Visible passes of ISS from St. Louis this week occur during the morning hours.  The best of these is on the morning of November 12. 

Catch ISS flying over St. Louis in the morning hours starting Monday, November 10. 

Date

Mag

Starts

Max. altitude

Ends

Time

Alt.

Az.

Time

Alt.

Az.

Time

Alt.

Az.

11 Nov

-1.3

04:29:21

28

ESE

04:29:21

28

ESE

04:31:49

10

ENE

11 Nov

-2.3

06:02:36

10

W

06:05:32

29

NNW

06:08:29

10

NNE

12 Nov

-3.0

05:15:32

44

WNW

05:15:58

48

NW

05:19:12

10

NE

13 Nov

-0.9

04:28:35

20

NE

04:28:35

20

NE

04:29:46

10

NE

13 Nov

-1.4

06:01:27

10

WNW

06:03:31

16

NNW

06:05:41

10

NNE

14 Nov

-1.6

05:14:19

21

NNW

05:14:19

21

NNW

05:16:28

10

NNE

15 Nov

-0.2

04:27:02

11

NE

04:27:02

11

NE

04:27:08

10

NE

15 Nov

-0.9

06:00:42

10

NNW

06:01:33

11

NNW

06:02:25

10

N

16 Nov

-0.8

05:12:28

13

N

05:12:28

13

N

05:13:22

10

NNE

 

Magnitude (Mag): The Measure of brightness for a celestial object.  The lower the value is, the brighter the object will be.

Altitude (Alt):  The angle of a celestial object measured upwards from the observer’s horizon.

Azimuth (Az):  The direction of a celestial object, measured clockwise from an observer’s location with north being 0°, east being 90°, south being 180° and west being 270°. 

For information about ISS flyovers and other visible satellites, visit www.heavens-above.com

Detailed information regarding all unmanned exploration of our universe, missions past, present, and planned, can be found at Jet Propulsion Laboratories:

http://www.jpl.nasa.gov/

The Planets Visible Without A Telescope

Mars

Mars is now in the constellation Sagittarius and rises before the Sun sets.  Mars will be seen in the southwestern skies about 20 minutes after sunset.  Mars will set by 8:06 p.m. 

Jupiter

The largest planet in the solar system is visible once again in the morning skies.  Jupiter can be found rising by 11:25 p.m. and will be easily visible by 12:00 a.m. in the eastern sky.  Jupiter can currently be found in the constellation Leo the Lion.        

Uranus and Neptune Opposition 2014

The two most distant planets in our solar system will be at their best for the next couple of months.  Neptune has already reached opposition and Uranus will reach opposition on October 7, 2014.  The opposition of a planet is when it is in opposition with the Sun.  What that means is a planet or other body such as an asteroid is seen on the opposite side of the Earth than the Sun is.  From our perspective this is when an object is at its brightest and also coincides with the object’s closest approach to the Earth.  Only objects further from the Sun than we are can be in opposition. 

Of the two planets Uranus will be the brightest.  Uranus is already appearing as a 5.8 magnitude object and will continue to brighten until October 7.  Uranus is normally a planet that requires binoculars to be seen but when the planet is nearing opposition dark sky observers can see it with the unaided eye.  Through telescopes observers will resolve Uranus into a small disk shaped object that may display a slight greenish blue color.  Large telescopes using high magnifications up to 300x might be able to discern dark and light patches called albedo features.  These features require large aperture telescopes and better than average viewing conditions to be seen. 

Uranus is currently in the constellation Pisces.  Pisces is very difficult to see in light polluted skies so it is better to start with the Great Square of Autumn.  This asterism connects the constellations Andromeda and Pegasus all of which will be seen high in the eastern sky by 10:00 p.m.  As the Great Square sits high in the east if you follow a line connecting the stars Scheat (Beta Peg) through Algenib (Gamma Peg) about the same distance that lays between the two stars you will find three stars the stand next to one another in a straight line.  The brightest of these stars is Delta Piscium.  Uranus is about four degrees south of these stars.  You will need either a desktop planetarium program or detailed star chart to help you pinpoint which star like object is Uranus. 

http://www.iau.org/static/public/constellations/gif/PSC.gif

http://www.iau.org/static/public/constellations/gif/PEG.gif

http://www.skyandtelescope.com/astronomy-news/observing-news/uranus-and-neptune-in-2014/

Neptune reached opposition on August 29, 2014.  It is now at its peak brightness of 7.8 magnitude.  This means that you will need at least binoculars to see this distant planet even when it is at its brightest.  Through binoculars Neptune will appear as a dim star like object in the constellation Aquarius.  To find Neptune first locate the bright star Fomalhaut.  About 6 to 10 degrees north of Fomalhaut you will find six bright stars that are shaped like a hyperboloid.  Scanning the sky further north you will find the star Sigma Aquarii.  Neptune will be just east of this star.      

Using a telescope most will see a star like object that when magnified enough will reveal a greyish blue disk.  Using a large telescope and high magnification up to 300x it may be possible to detect albedo features and Neptune largest moon Triton.  Triton will appear as a dim star right next to Neptune.

Like Uranus Neptune will require some kind of astronomy software of a detailed map to find.  As we pass by these planets in our orbit see if you can detect there shift amongst the background stars.  Below are a few links that will be helpful in locating Neptune and the stars mentioned above.

http://www.iau.org/static/public/constellations/gif/AQR.gif

http://www.skyandtelescope.com/astronomy-news/observing-news/uranus-and-neptune-in-2014/

Constellation of the Month

Each month we will highlight one constellation and some of the objects that can be found within the boundaries of that constellation.  At the start of the month we will list only a few of these objects and each week we will add another to the list.  Some objects will be visible to the unaided eye and some may require a telescope.  Many of the objects listed will require a map of the sky to find or may require repeat observations to notice various properties.  Links to star charts and other information that will be useful in identifying the objects listed will be given at the end of each week’s section. 

This month we will explore the constellation Pegasus.  Pegasus is the famous flying horse that appears in the story of Perseus.  Pegasus was the offspring of Poseidon and Medusa who was born to the world once Medusa was slain in battle by Perseus.  Pegasus is said to have aided Perseus in his fight against the Titan Cetus and also was eventually awarded a place in the stables of Mt. Olympus tasked with caring the lightning bolts of Zeus. 

To find Pegasus first locate the Great Square of Autumn from our list of asterisms we covered last month.  The Great Square connects the constellations Andromeda to Pegasus and will be best seen nearly over head after 10 p.m. 

http://www.iau.org/static/public/constellations/gif/PEG.gif

As for the individual objects we will cover this month Pegasus can be seen as a bit sparse for the beginning observer.  Pegasus has many fine targets to look for however they are a little more on the advanced end of the observing challenges.  All the targets we will talk about this month can be seen in binoculars of varying apertures however they will require the ability to recognize faint and complex star fields to confirm that the object was seen.  Even though I would describe these as advanced observing projects that does not mean the beginning observer cannot find them.  In fact these objects will help push your observing abilities and help refine your observing skills. 

The first object we will cover in November is the globular cluster Messier 15.  This will be the only easy object to find that we cover this month in the night sky update.  Messier 15 is one of the roughly 160 globular clusters found in the Milky Way Galaxy.  Globular clusters are the densely packed ancient star clusters that orbit the outer halo and center of our galaxy.  Messier 15 contains over 100,000 stars that lie at a distance of about 33,000 light years. 

Also of interest is that Messier 15 is one of the prototype globular clusters that exhibit something called core collapse.  The core collapse of a globular cluster is the result of how its stars orbit within the cluster and interact with one another.  Due to a transfer of energy, stars near the core begin to migrate further into the core while the stars associated with the cluster’s halo migrate further out.  The star populations in the core of globular clusters that exhibit core collapse are nearly ten billion times more densely packed than that of the Sun’s neighborhood in the Milky Way.  Visually what that means is the globular cluster will have increasing magnitudes as you look from its edge to its core. 

To find Messier 15 first locate the Great Square of Autumn.  The southwestern most star in the square is called Markab.  From this star if you continue scanning southwest you will find the stars Homan and Theta Pegasi.  From Theta Pegasi look about 7 degrees to the northwest and you will find the star Enif.  Continuing along this same path you will find Messier 15 about 2 to 3 degrees to the northwest of Enif.  It will appear as a fuzzy star.  It is listed at about 6.2 magnitude and will appear to cover about 7 arc minutes of sky.  Due to the core collapse aspect of this globular many of its member stars cover an area of about 21 arc minutes but will remain unseen due to their great distance from us. 

http://www.iau.org/static/public/constellations/gif/PEG.gif 

The object for the week of November 10 is the star 51 Pegasi.  At first glance this is a star that would not seem to warrant a lot of attention.  It is a G-class dwarf star that is similar in size to the Sun (a bit bigger).  It is a main sequence star that is fusing hydrogen at its core; it has a high metallicity and would be considered middle aged for its temperature and mass.  In all 51 Pegasi is very similar to the Sun.  All of these traits that may seem to make 51 Pegasi appear as an average generic star are what makes 51 Pegasi an ideal candidate for a star that has planets.  In 1995 this idea was confirmed when scientists using an observational method called radial velocity discovered a Jupiter size body orbiting the star. 

The potential exoplanet orbiting 51 Pegasi has been formally named 51 Pegasi b with some calling it Bellerophon, who was the ancient Greek hero who slew the Chimera with the assistance of Pegasus.  This was the first exoplanet discovered orbiting a main sequence star.  51 Peg b is a body that orbits 51 Pegasi at a distance of roughly 0.05 AU (4.65 million miles).  It is tidally locked which means the same side of the body is always pointed at the star.  Due to this the side that is pointed at the star would have temperatures reaching 1,800 degrees Fahrenheit. 

There has been some thought that 51 Peg b is a brown dwarf star.  This would suggest that 51 Pegasi is a binary star system.  The reason for this is at the time of 51 Peg b’s discovery a Jupiter sized body forming so close to its parent star seemed highly unlikely.  Since the discovery of 51 Peg b a number of other Jupiter sized planets have been discovered orbiting their stars at similar close distances.  These exoplanets have been called Hot Jupiters.  Most view 51 Peg b as an exoplanet however there is still some debate on the issue.

To find 51 Pegasi first locate the Great Square of Autumn.  Next locate the two stars that make up the western half of the square, Alpha and Beta Pegasi.  About halfway between these two stars there will be two 5th magnitude stars.  The western of these is 51 Pegasi.  The map I will link below shows 51 Pegasi but it does not label it.  So for confirmation you will need to locate a more detailed map of the sky or use planetarium software such as Stellarium.  This software is free to download and is an extremely useful tool for the backyard stargazer. 

http://www.iau.org/static/public/constellations/gif/PEG.gif            

Our next Star Party will be held on Friday, December 5, 2014, from dusk until 10 p.m.

Weather permitting, the St. Louis Astronomical Society and the Science Center will set up a number of telescopes outdoors and be on-hand to answer your questions.  Telescope viewing begins at 8:00 p.m.  Regardless of the weather on December 5, join us indoors in our planetarium theater for “The Sky Tonight”.  Showtime is at 7 p.m.
This free, indoor star program will introduce you to the current night sky, the planets, and the seasonal constellations. Doors open 15 minutes before show time. Shows begins at 7 p.m. Sorry, no late admissions due to safety issues in the darkened theater.

The St. Louis Astronomical Society hosts the monthly Star Parties at the Science Center which are held on the first Friday of each month. Our Monthly Star Parties are open to the public and free of charge.  For more information about the St. Louis Astronomical Society visit their website at www.slasonline.org

Week of November 3, 2014

This is the Saint Louis Science Center’s NIGHT SKY UPDATE for the week of Monday, November 3.  All times are given as local St. Louis time (Central Standard Time).  For definitions of terminology used in the night sky update, click the highlighted text.

Information updated weekly or as needed.

 Join us for our next star party, Friday, November 7, 2014 held in association with the St. Louis Astronomical Society. For details, see the information at the bottom of this page.

The Sun and the Moon

Sunrise is at 6:30 a.m. on Monday, November 3 and sunset is at 4:59 p.m. providing us with about 10.5 hours of daylight.  Even after sunset, the light from the Sun will still dimly illuminate our sky for about 1.5 hours.  This period of time is called twilight, which ends around 6:26 p.m. this week.  For those with a sun dial, solar transit or local noon occurs around 11:45 p.m. this week. 

Day

Sunrise

Sunset

03 Nov

6:30 a.m.

4:59 p.m.

04 Nov

6:31 a.m.

4:58 p.m.

05 Nov

6:32 a.m.

4:57 p.m.

06 Nov

6:33 a.m.

4:56 p.m.

07 Nov

6:34 a.m.

4:55 p.m.

08 Nov

6:35 a.m.

4:54 p.m.

09 Nov

6:37 a.m.

4:53 p.m.

Moonrise for Monday, November 3 occurs at 3:05 p.m. and moonset will occur at 3:51 a.m. on the following day.  On Monday, November 3 the Moon will be exhibiting a waxing gibbous phase with about 87% of the lunar disk illuminated.  Full moon occurs on November 6 at 4:23 p.m.  November’s full moon is known as the Full Beaver Moon.

International Space Station (ISS) Observing

Visible passes of ISS from St. Louis this week occur during the morning hours.  The best of these is on the mornings of November 9 and 10. 

Catch ISS flying over St. Louis in the morning hours starting Monday, November 3. 

Date

Mag

Starts

Max. altitude

Ends

Time

Alt.

Az.

Time

Alt.

Az.

Time

Alt.

Az.

07 Nov

-1.5

06:06:44

10

SSW

06:09:47

35

SE

06:12:51

10

ENE

08 Nov

-0.5

05:18:09

10

S

05:20:35

19

SE

05:23:02

10

E

09 Nov

-3.3

06:04:22

10

SW

06:07:40

74

NW

06:10:59

10

NE

10 Nov

-2.7

05:15:49

16

SW

05:18:18

58

SE

05:21:34

10

ENE

Magnitude (Mag): The Measure of brightness for a celestial object.  The lower the value is, the brighter the object will be.

Altitude (Alt):  The angle of a celestial object measured upwards from the observer’s horizon.

Azimuth (Az):  The direction of a celestial object, measured clockwise from an observer’s location with north being 0°, east being 90°, south being 180° and west being 270°.

For information about ISS flyovers and other visible satellites, visit www.heavens-above.com

Detailed information regarding all unmanned exploration of our universe, missions past, present, and planned, can be found at Jet Propulsion Laboratories:

http://www.jpl.nasa.gov/

The Planets Visible Without A Telescope

Mars

Mars is now in the constellation Sagittarius and rises before the Sun sets.  Mars will be seen in the southwestern skies about 20 minutes after sunset.  Mars will set by 8:09 p.m. 

Jupiter

The largest planet in the solar system is visible once again in the morning skies.  Jupiter can be found rising by 11:49 a.m. and will be easily visible by 12:30 a.m. in the eastern sky.  Jupiter can currently be found in the constellation Leo the Lion.    

Uranus and Neptune Opposition 2014

The two most distant planets in our solar system will be at their best for the next couple of months.  Neptune has already reached opposition and Uranus will reach opposition on October 7, 2014.  The opposition of a planet is when it is in opposition with the Sun.  What that means is a planet or other body such as an asteroid is seen on the opposite side of the Earth than the Sun is.  From our perspective this is when an object is at its brightest and also coincides with the object’s closest approach to the Earth.  Only objects further from the Sun than we are can be in opposition. 

Of the two planets Uranus will be the brightest.  Uranus is already appearing as a 5.8 magnitude object and will continue to brighten until October 7.  Uranus is normally a planet that requires binoculars to be seen but when the planet is nearing opposition dark sky observers can see it with the unaided eye.  Through telescopes observers will resolve Uranus into a small disk shaped object that may display a slight greenish blue color.  Large telescopes using high magnifications up to 300x might be able to discern dark and light patches called albedo features.  These features require large aperture telescopes and better than average viewing conditions to be seen. 

Uranus is currently in the constellation Pisces.  Pisces is very difficult to see in light polluted skies so it is better to start with the Great Square of Autumn.  This asterism connects the constellations Andromeda and Pegasus all of which will be seen high in the eastern sky by 10:00 p.m.  As the Great Square sits high in the east if you follow a line connecting the stars Scheat (Beta Peg) through Algenib (Gamma Peg) about the same distance that lays between the two stars you will find three stars the stand next to one another in a straight line.  The brightest of these stars is Delta Piscium.  Uranus is about four degrees south of these stars.  You will need either a desktop planetarium program or detailed star chart to help you pinpoint which star like object is Uranus. 

http://www.iau.org/static/public/constellations/gif/PSC.gif

http://www.iau.org/static/public/constellations/gif/PEG.gif

http://www.skyandtelescope.com/astronomy-news/observing-news/uranus-and-neptune-in-2014/

Neptune reached opposition on August 29, 2014.  It is now at its peak brightness of 7.8 magnitude.  This means that you will need at least binoculars to see this distant planet even when it is at its brightest.  Through binoculars Neptune will appear as a dim star like object in the constellation Aquarius.  To find Neptune first locate the bright star Fomalhaut.  About 6 to 10 degrees north of Fomalhaut you will find six bright stars that are shaped like a hyperboloid.  Scanning the sky further north you will find the star Sigma Aquarii.  Neptune will be just east of this star.       

Using a telescope most will see a star like object that when magnified enough will reveal a greyish blue disk.  Using a large telescope and high magnification up to 300x it may be possible to detect albedo features and Neptune largest moon Triton.  Triton will appear as a dim star right next to Neptune.

Like Uranus Neptune will require some kind of astronomy software of a detailed map to find.  As we pass by these planets in our orbit see if you can detect there shift amongst the background stars.  Below are a few links that will be helpful in locating Neptune and the stars mentioned above.

http://www.iau.org/static/public/constellations/gif/AQR.gif

http://www.skyandtelescope.com/astronomy-news/observing-news/uranus-and-neptune-in-2014/

Constellation of the Month

Each month we will highlight one constellation and some of the objects that can be found within the boundaries of that constellation.  At the start of the month we will list only a few of these objects and each week we will add another to the list.  Some objects will be visible to the unaided eye and some may require a telescope.  Many of the objects listed will require a map of the sky to find or may require repeat observations to notice various properties.  Links to star charts and other information that will be useful in identifying the objects listed will be given at the end of each week’s section. 

This month we will explore the constellation Pegasus.  Pegasus is the famous flying horse that appears in the story of Perseus.  Pegasus was the offspring of Poseidon and Medusa who was born to the world once Medusa was slain in battle by Perseus.  Pegasus is said to have aided Perseus in his fight against the Titan Cetus and also was eventually awarded a place in the stables of Mt. Olympus tasked with caring the lightning bolts of Zeus. 

To find Pegasus first locate the Great Square of Autumn from our list of asterisms we covered last month.  The Great Square connects the constellations Andromeda to Pegasus and will be best seen nearly over head after 10 p.m. 

http://www.iau.org/static/public/constellations/gif/PEG.gif

As for the individual objects we will cover this month Pegasus can be seen as a bit sparse for the beginning observer.  Pegasus has many fine targets to look for however they are a little more on the advanced end of the observing challenges.  All the targets we will talk about this month can be seen in binoculars of varying apertures however they will require the ability to recognize faint and complex star fields to confirm that the object was seen.  Even though I would describe these as advanced observing projects that does not mean the beginning observer cannot find them.  In fact these objects will help push your observing abilities and help refine your observing skills. 

The first object we will cover in November is the globular cluster Messier 15.  This will be the only easy object to find that we cover this month in the night sky update.  Messier 15 is one of the roughly 160 globular clusters found in the Milky Way Galaxy.  Globular clusters are the densely packed ancient star clusters that orbit the outer halo and center of our galaxy.  Messier 15 contains over 100,000 stars that lie at a distance of about 33,000 light years. 

Also of interest is that Messier 15 is one of the prototype globular clusters that exhibit something called core collapse.  The core collapse of a globular cluster is the result of how its stars orbit within the cluster and interact with one another.  Due to a transfer of energy, stars near the core begin to migrate further into the core while the stars associated with the cluster’s halo migrate further out.  The star populations in the core of globular clusters that exhibit core collapse are nearly ten billion times more densely packed than that of the Sun’s neighborhood in the Milky Way.  Visually what that means is the globular cluster will have increasing magnitudes as you look from its edge to its core. 

To find Messier 15 first locate the Great Square of Autumn.  The southwestern most star in the square is called Markab.  From this star if you continue scanning southwest you will find the stars Homan and Theta Pegasi.  From Theta Pegasi look about 7 degrees to the northwest and you will find the star Enif.  Continuing along this same path you will find Messier 15 about 2 to 3 degrees to the northwest of Enif.  It will appear as a fuzzy star.  It is listed at about 6.2 magnitude and will appear to cover about 7 arc minutes of sky.  Due to the core collapse aspect of this globular many of its member stars cover an area of about 21 arc minutes but will remain unseen due to their great distance from us. 

http://www.iau.org/static/public/constellations/gif/PEG.gif

Our next Star Party will be held on Friday, November 7, 2014, from dusk until 10 p.m.

Weather permitting, the St. Louis Astronomical Society and the Science Center will set up a number of telescopes outdoors and be on-hand to answer your questions.  Telescope viewing begins at 8:00 p.m.  Regardless of the weather on November 7, join us indoors in our planetarium theater for “The Sky Tonight”.  Showtime is at 7 p.m.

This free, indoor star program will introduce you to the current night sky, the planets, and the seasonal constellations. Doors open 15 minutes before show time. Shows begins at 7 p.m. Sorry, no late admissions due to safety issues in the darkened theater.

The St. Louis Astronomical Society hosts the monthly Star Parties at the Science Center which are held on the first Friday of each month. Our Monthly Star Parties are open to the public and free of charge.  For more information about the St. Louis Astronomical Society visit their website at www.slasonline.org

 

 

 

 

Week of Monday, October 27

This is the Saint Louis Science Center’s NIGHT SKY UPDATE for the week of Monday, October 27.  All times are given as local St. Louis time (Central Daylight Time).  For definitions of terminology used in the night sky update, click the highlighted text.

Information updated weekly or as needed.

Join us for our next star party, Friday, November 7, 2014 held in association with the St. Louis Astronomical Society. For details, see the information at the bottom of this page.

The Sun and the Moon

Sunrise is at 7:22 a.m. on Monday, October 27 and sunset is at 6:07 p.m. providing us with about 10.75 hours of daylight.  Even after sunset, the light from the Sun will still dimly illuminate our sky for about 1.5 hours.  This period of time is called twilight, which ends around 7:36 p.m. this week.  For those with a sun dial, solar transit or local noon occurs around 12:45 p.m. this week. 

Daylight savings time ends on November 2.  Remember to fall back one hour once we return to Central Standard Time on November 2, 2014.  Below you will find sunrise and sunset times for the rest of the week.  Note that all times in this table except for November 2 are in Central Daylight Time.   

Day

Sunrise

Sunset

27 Oct

7:22 a.m.

6:07 p.m.

28 Oct

7:24 a.m.

6:06 p.m.

29 Oct

7:25 a.m.

6:04 p.m.

30 Oct

7:26 a.m.

6:03 p.m.

31 Oct

7:27 a.m.

6:02 p.m.

01 Nov

7:28 a.m.

6:01 p.m.

02 Nov

6:29 a.m.

5:00 p.m.

        

Moonrise for Monday, October 27 occurs at 10:57 a.m. and moonset will occur at 9:14 p.m.  On Monday, October 27 the Moon will be exhibiting a waxing crescent phase with about 15% of the lunar disk illuminated.  First quarter moon occurs on October 30 at 9:48 p.m.

International Space Station (ISS) Observing

Visible passes of ISS from St. Louis this week occur during the evening hours.  The best of these is on the evening of October 28. 

Catch ISS flying over St. Louis in the evening hours starting Monday, October 27. 

Date

Mag

Starts

Max. altitude

Ends

Time

Alt.

Az.

Time

Alt.

Az.

Time

Alt.

Az.

27 Oct

-1.5

19:24:08

10

WNW

19:27:08

31

SW

19:30:06

10

SSE

28 Oct

-2.7

18:34:38

10

WNW

18:37:56

60

SW

18:41:13

10

SE

29 Oct

 0.1

19:24:00

10

WSW

19:24:52

11

SW

19:25:44

10

SW

30 Oct

-0.3

18:33:12

10

W

18:35:43

20

SW

18:38:13

10

S

 

Magnitude (Mag): The Measure of brightness for a celestial object.  The lower the value is, the brighter the object will be.

Altitude (Alt):  The angle of a celestial object measured upwards from the observer’s horizon.

Azimuth (Az):  The direction of a celestial object, measured clockwise from an observer’s location with north being 0°, east being 90°, south being 180° and west being 270°. 

For information about ISS flyovers and other visible satellites, visit www.heavens-above.com

Detailed information regarding all unmanned exploration of our universe, missions past, present, and planned, can be found at Jet Propulsion Laboratories:

http://www.jpl.nasa.gov/

The Planets Visible Without A Telescope

Mars

Mars is now in the constellation Ophiuchus and rises before the Sun sets.  Mars will be seen in the southwestern skies about 20 minutes after sunset.  Mars will set by 9:13 p.m. 

Jupiter

The largest planet in the solar system is visible once again in the morning skies.  Jupiter can be found rising by 1:16 a.m. and will be easily visible by 1:40 a.m.        

Uranus and Neptune Opposition 2014

The two most distant planets in our solar system will be at their best for the next couple of months.  Neptune has already reached opposition and Uranus will reach opposition on October 7, 2014.  The opposition of a planet is when it is in opposition with the Sun.  What that means is a planet or other body such as an asteroid is seen on the opposite side of the Earth than the Sun is.  From our perspective this is when an object is at its brightest and also coincides with the object’s closest approach to the Earth.  Only objects further from the Sun than we are can be in opposition. 

Of the two planets Uranus will be the brightest.  Uranus is already appearing as a 5.8 magnitude object and will continue to brighten until October 7.  Uranus is normally a planet that requires binoculars to be seen but when the planet is nearing opposition dark sky observers can see it with the unaided eye.  Through telescopes observers will resolve Uranus into a small disk shaped object that may display a slight greenish blue color.  Large telescopes using high magnifications up to 300x might be able to discern dark and light patches called albedo features.  These features require large aperture telescopes and better than average viewing conditions to be seen. 

Uranus is currently in the constellation Pisces.  Pisces is very difficult to see in light polluted skies so it is better to start with the Great Square of Autumn.  This asterism connects the constellations Andromeda and Pegasus all of which will be seen high in the eastern sky by 10:00 p.m.  As the Great Square sits high in the east if you follow a line connecting the stars Scheat (Beta Peg) through Algenib (Gamma Peg) about the same distance that lays between the two stars you will find three stars the stand next to one another in a straight line.  The brightest of these stars is Delta Piscium.  Uranus is about four degrees south of these stars.  You will need either a desktop planetarium program or detailed star chart to help you pinpoint which star like object is Uranus. 

http://www.iau.org/static/public/constellations/gif/PSC.gif

http://www.iau.org/static/public/constellations/gif/PEG.gif

http://www.skyandtelescope.com/astronomy-news/observing-news/uranus-and-neptune-in-2014/

Neptune reached opposition on August 29, 2014.  It is now at its peak brightness of 7.8 magnitude.  This means that you will need at least binoculars to see this distant planet even when it is at its brightest.  Through binoculars Neptune will appear as a dim star like object in the constellation Aquarius.  To find Neptune first locate the bright star Fomalhaut.  About 6 to 10 degrees north of Fomalhaut you will find six bright stars that are shaped like a hyperboloid.  Scanning the sky further north you will find the star Sigma Aquarii.  Neptune will be just east of this star.      

Using a telescope most will see a star like object that when magnified enough will reveal a greyish blue disk.  Using a large telescope and high magnification up to 300x it may be possible to detect albedo features and Neptune largest moon Triton.  Triton will appear as a dim star right next to Neptune.

Like Uranus Neptune will require some kind of astronomy software of a detailed map to find.  As we pass by these planets in our orbit see if you can detect there shift amongst the background stars.  Below are a few links that will be helpful in locating Neptune and the stars mentioned above.

http://www.iau.org/static/public/constellations/gif/AQR.gif

http://www.skyandtelescope.com/astronomy-news/observing-news/uranus-and-neptune-in-2014/

Constellation of the Month

Each month we will highlight one constellation and some of the objects that can be found within the boundaries of that constellation.  At the start of the month we will list only a few of these objects and each week we will add another to the list.  Some objects will be visible to the unaided eye and some may require a telescope.  Many of the objects listed will require a map of the sky to find or may require repeat observations to notice various properties.  Links to star charts and other information that will be useful in identifying the objects listed will be given at the end of each week’s section. 

This month we will once again forego a single constellation and discuss a number of different patterns.  This month we will work on finding some of the informal groupings of stars called asterisms.  These informal patterns can be large groups that contain multiple constellations or they can be small dim groupings that require a telescope to see. Many of them serve as useful markers in the sky that help you find dimmer and more difficult objects.  

The first asterism we will cover in October is the Summer Triangle.  This is one we have mentioned and used numerous times in the night sky update.  Last week in fact we used it in reference to finding Cygnus the Swan.  Other constellations that comprise this asterism are Lyra the Harp and Aquila the Eagle.  Inside the Summer Triangle we find the constellations Vulpecula the Fox, Sagitta the Arrow and just outside the eastern edge is Delphinus the Dolphin.  Scattered throughout these constellations are many gems for double star observers, numerous open star clusters and a number of nebulas.  The first step in finding all of these is taken by first locating the Summer Triangle.

Also of interest regarding the Summer Triangle is a Mission called Kepler.  This is a space telescope that steadily observed the patch of sky between Cygnus and Lyra.  What Kepler was looking for was the subtle changes in a star’s light due to the effects of a planet orbiting around it.  Thanks to the Kepler mission and other research programs scientists currently have 5,022 candidate exoplanets (planets orbiting other stars) of which 1,746 have been confirmed.  With these numbers scientists have estimated that there are likely as many planets as there are stars in the Milky Way galaxy if not more.  If you would like to learn more about Kepler and the hunt for exoplanets visit http://planetquest.jpl.nasa.gov/   

With a name like the Summer Triangle you would think that we would start losing this asterism soon as we approach winter.  Due to the longer nights we will continue to see the Summer Triangle for the rest of the year.  Tonight go outside and simply look straight up and you should see the three bright stars Deneb, Vega and Altair that define the triangle shape.  Once you can find this asterism grab some binocular and a reclined chair and just start scanning this part of the sky.  Dense star fields and numerous stars clusters will keep you busy for some time. 

The asterism we will cover for the week of October 6 is the Great Square of Autumn.  This is another asterism that can serve as a reference point or guide post in the sky.  Much like the Summer Triangle, the Great Square of Autumn can be used to find a number of constellations and other objects of interest.  The Great Square primarily consists of two constellations; Andromeda and Pegasus.  As most of the square is in Pegasus it is also called the Square of Pegasus.  The Great Square of Autumn can also help you find the constellations Piscis, Cetus, Aquarius, Lacerta and Equuleus. 

One of the more challenging objects the Great Square can help you find is the bright variable star Mira.  Mira is a long period variable that every 333 days or so will brighten from 10th magnitude up to about 3rd magnitude.  This change does not occur in one day but over the entire 333 day cycle.  The brightening of the Mira takes about 100 days and will take twice as long to fade back to minima.  Mira was one of the first variable stars other than bright supernovas or novae to be discovered and it certainly is one of the brightest.  Unfortunately Mira has already peaked in brightness and is already well into its slow downward fade for 2014. 

Mira is an M-class red giant star that is approximately 6 billion years old.  The variable nature of Mira is due to an internal pulsation which is a result of the unstable nature of the star.  The Sun will likely come to a similar state as it evolves into a red giant star in another 5 billion years.  Mira is one of the brightest stars in the constellation Cetus.  Depending on the map you use to find Mira you may find it labeled Omicron Ceti.  

http://www.iau.org/static/public/constellations/gif/CET.gif

Finding the Great Square of Autumn is simple but it does depend on what time you look for it.  After sunset the square will be seen low in the east looking more like a diamond.  At midnight it will be nearly overhead and before sunrise it will be found low in the west. 

For the rest of the month we will cover asterisms that are still helpful guides in the sky but they will be found in individual constellations and will require an optical device such as binoculars to see.

The asterism for the week of October 13 is the star cluster known as the ET cluster.  This group of roughly 100-150 stars is frequently called the ET Cluster but officially it is named NGC 457.  The name ET Cluster is comes from the idea that the stars of NGC 457 look a bit like the famous alien character from the movie E.T.  The human brain is well suited to finding familiar patterns in a seemingly random grouping of objects.  Much like people do with clouds or blots of paint people see all kinds of patterns in the stars which of course is the theme of this month’s night sky update.  Other names given to NGC 457 are Caldwell 13 (catalog number), the Owl Cluster and the Number 5 is Alive Cluster.

The ET Cluster is located in the constellation Cassiopeia near the bright star Delta Cassiopeiae.  This 21 million year old cluster of stars is situated about 10 thousand light years away in the Perseus Arm of the Milky Way Galaxy.  When you look at it through binoculars you will see a dim patch of light with about 20 or 30 stars visible.  With telescopes you can see around 100 stars that at even such a great distance will seem detached from the background stars.  Once you are looking at the ET Cluster you will notice two bright stars called Psi-1 and Psi-2 Cassiopeiae.  These two stars represent the eyes of ET which may not be in the cluster itself.  Below the eyes there is a long chain of stars that represents ET’s arms and below that is the main body of the cluster which is seen as ET’s body. 

To find the ET cluster first find the W-shape of the constellation Cassiopeia.  The bright “W” asterism of Cassiopeia will be visible high in the northeast after sunset.  As the night progresses the “W” will pass overhead in the north and will be seen in the northwest before sunrise.  Once you can identify Cassiopeia locate the two western most stars of the W-shape called Epsilon and Delta Cassiopeiae.  Then follow a line from Epsilon to Delta and continue for another 2.5 degrees below Delta and you will find the ET Cluster.   

http://www.iau.org/static/public/constellations/gif/CAS.gif

Any way you look at the ET cluster it stands out as one of the best in Cassiopeia and it sits in a crowed part of the sky in regards to other open star clusters.  If you can find the ET Cluster there are a number of open clusters within a 5 degree distance to the north.  A few of them are M103, NGC 663, NGC 654, NGC 659, NGC 436 and NGC 381.  From a dark location most of these are excellent binocular targets.        

The asterism for the week of October 20 is Kemble’s Cascade.  This is currently my favorite asterism and is one that we covered in April when talking about the constellation Camelopardalis.  I choose to return to this object for a few reasons.  First it is beautiful, second it is one of those objects that favor binoculars over telescopes and third the part of the sky it is in is loaded with lots of great objects in other constellations.  It is because of this last reason that part of the fun in observing Kemble’s cascade is in the search for it. 

This grouping of stars was discovered by an amateur astronomer named Lucian Kemble.  He was scanning Camelopardalis and noticed a string of stars that spanned about 2.5 degrees of sky.  It was later named in his honor and remains a popular target in the sparse constellation of Camelopardalis.

Kemble’s Cascade is a string of 20 stars, mostly 7th to 10th magnitude, which spans about 2.5 degrees.  The center of the string is accented with a 5th magnitude star.  The stars that make up Kemble’s Cascade are not related to each so what we see is just a chance alignment.  Following this cascade of stars to the southwest will bring us to an open star cluster called NGC 1502.  This cluster contains about 45 stars that will appear as a faint glow at the end of Kemble’s Cascade. 

One way to find Kemble’s Cascade is by first locating Beta and Alpha Cam using binoculars.  This can be done by first following the steps to find last week’s ET cluster.  The two bright stars in Cassiopeia, Delta and Epsilon Cassiopeiae will also help you find Kemble’s cascade. 

http://iau.org/static/public/constellations/gif/CAS.gif

Scan from Delta to Epsilon Cassiopeiae about 10 degrees to the northwest.  This will bring you to Gamma Cam.  Below Gamma Cam you will find Alpha and Beta Cam

http://iau.org/static/public/constellations/gif/CAM.gif

From Alpha Cam scan about 5 degrees to the east and you will find Kemble’s Cascade.

My favorite way to find Kemble’s Cascade is to first find the constellation Perseus south of the western half of the constellation Cassiopeia.

http://iau.org/static/public/constellations/gif/CAS.gif

http://iau.org/static/public/constellations/gif/PER.gif

With binoculars locate the bright star Mirfak at the center of Perseus.  This bright star is in the middle of the Alpha Persei Moving group of stars.  It is a nearby broad open star cluster that is beautiful in low power binoculars.  From here move north the helmet of Perseus to find NGC 869/884 also known as the Perseus Double Cluster.  Two degrees to the north you can find Stock 2 also known as the muscle man cluster.  A bit north and west from Stock 2 is the Heart and Soul nebulas and a scattering of dimmer open star clusters.  The Heart and Souls Nebulas are two beautiful emission nebulae that will require dark skies to be seen.  And finally another five degrees to the west you will find Kemble’s Cascade.  Now I admit that this method of finding Kemble’s Cascade seems a bit complicated and will require a more advanced map to identify all the objects just named, but it is not often you can star hop using deep sky objects instead stars.     

If you are up for a challenge and have dark skies there are even a few dim galaxies you can try to find that are north and west of Kemble’s Cascade called IC 342 and IC 356.  Unfortunately for these you will need large binoculars or a telescope to seem them. 

The final asterism we will cover is called the Coat Hanger asterism.  This group of stars was once believed to be a star cluster and was named Collinder 399.  After results from the Hipparcos satellite were analyzed it became clear that this grouping of stars was just a chance alignment.  It consists of ten stars with six in a line and four forming the hook of the hanger.  The member stars have distances ranging from 200 to a bit over 1000 light years. 

To find the Coat Hanger asterism we have to return the first asterism covered this month, the Summer Triangle.  The Coat Hanger is located near the eastern edge of the minor constellation Vulpecula the Fox.  Unfortunately Vulpecula is not the brightest of constellations so we will use the bright Summer Triangle stars Altair and Vega to locate the Coat Hanger.  Using binoculars scan between the bright stars Altair and Vega.  About 1/3 the distance between them is where you will find the Coat Hanger.  The Coat Hanger will appear upside down.

http://iau.org/static/public/constellations/gif/VUL.gif

Due to the amount of sky covered by the asterism binoculars may be the preferred way to see the Coat Hanger.  If you chose a telescope make sure to use low power eyepieces when observing this pattern of stars.  Other Objects in the vicinity of this asterism are the planetary nebulae M27 and M57, M11 the Wild Duck Cluster and the globular cluster M71.    

Our next Star Party will be held on Friday, November 7, 2014, from dusk until 10 p.m.

Weather permitting, the St. Louis Astronomical Society and the Science Center will set up a number of telescopes outdoors and be on-hand to answer your questions.  Telescope viewing begins at 8:00 p.m.  Regardless of the weather on November 7, join us indoors in our planetarium theater for “The Sky Tonight”.  Showtime is at 7 p.m.
This free, indoor star program will introduce you to the current night sky, the planets, and the seasonal constellations. Doors open 15 minutes before show time. Shows begins at 7 p.m. Sorry, no late admissions due to safety issues in the darkened theater.

The St. Louis Astronomical Society hosts the monthly Star Parties at the Science Center which are held on the first Friday of each month. Our Monthly Star Parties are open to the public and free of charge.  For more information about the St. Louis Astronomical Society visit their website at www.slasonline.org

Week of Monday, October 20

This is the Saint Louis Science Center’s NIGHT SKY UPDATE for the week of Monday, October 20.  All times are given as local St. Louis time (Central Daylight Time).  For definitions of terminology used in the night sky update, click the highlighted text.

Information updated weekly or as needed.

Join us for our next star party, Friday, November 7, 2014 held in association with the St. Louis Astronomical Society. For details, see the information at the bottom of this page.

The Sun and the Moon

Sunrise is at 7:15 a.m. on Monday, October 20 and sunset is at 6:16 p.m. providing us with 11 hours of daylight.  Even after sunset, the light from the Sun will still dimly illuminate our sky for about 1.5 hours.  This period of time is called twilight, which ends around 7:44 p.m. this week.  For those with a sun dial, solar transit or local noon occurs around 12:46 p.m. this week.  Below you will find sunrise and sunset times for the rest of the week.

Day

Sunrise

Sunset

20 Oct

7:15 a.m.

6:16 p.m.

21 Oct

7:16 a.m.

6:14 p.m.

22 Oct

7:17 a.m.

6:13 p.m.

23 Oct

7:18 a.m.

6:12 p.m.

24 Oct

7:19 a.m.

6:11 p.m.

25 Oct

7:20 a.m.

6:09 p.m.

26 Oct

7:21 a.m.

6:08 p.m.

 

On October 23 the Moon will pass between the Earth and Sun.  This happens once a month during new moon but when they are aligned just right we see the Moon pass in front of the Sun or what is called a solar eclipse.  The October 23 solar eclipse will only be a partial eclipse but it will still be interesting to see.  The eclipse starts for us in St. Louis around 4:41 p.m.  As the Moon gradually moves in front of the Sun you will see a dark disk obscure it.  By 5:47 p.m. which is the greatest extent of the eclipse you will only see about 36% of the Sun covered by the Moon.  If you have a safe means to observe the eclipse you just need to find a high point nearby with a clear view of the west.  If you do not have a safe way to observe the Sun you can tune in to live.slooh.com where they will broadcast the eclipse live.  The eclipse will still be in progress as the sun sets on St. Louis. 

***************************************************************************************************************

Unfortunately solar eclipse can only be safely observed if you have safe solar filters or some kind of projection device.  You should NEVER look directly at the Sun through an unfiltered telescope, binocular, camera or without solar filter glasses. 

Below you will find links that have information about the October 23 partial eclipse, how you can safely observe solar eclipse and why looking at the Sun will cause serious eye damage that could lead to loss of vision.  I would highly recommend reading the eye damage link. 

http://eclipse.gsfc.nasa.gov/OH/OHfigures/OH2014-Fig04.pdf

http://www.mreclipse.com/Totality2/TotalityCh11.html#Pinhole

http://www.mreclipse.com/Special/filters.html       

Moonrise for Monday, October 20 occurs at 4:05 a.m. and moonset will occur at 4:36 p.m.  On Monday, October 20 the Moon will be exhibiting a waning crescent phase with about 10% of the lunar disk illuminated.  New moon occurs on October 23 at 4:57 p.m.

International Space Station (ISS) Observing

Visible passes of ISS from St. Louis this week occur during the evening hours.  The best of these is on the evenings of October 25 and 26. 

Catch ISS flying over St. Louis in the evening hours starting Monday, October 20. 

Date

Mag

Starts

Max. altitude

Ends

Time

Alt.

Az.

Time

Alt.

Az.

Time

Alt.

Az.

20 Oct

-0.6

20:18:14

10

NNW

20:19:00

14

NNW

20:19:00

14

NNW

21 Oct

-1.3

19:29:30

10

NNW

19:31:48

17

NNE

19:31:59

17

NNE

22 Oct

-1.0

18:40:49

10

NNW

18:42:30

13

NNE

18:44:11

10

NE

22 Oct

-1.0

20:16:32

10

NW

20:17:53

22

NW

20:17:53

22

NW

23 Oct

-2.4

19:27:36

10

NW

19:30:39

32

NNE

19:30:58

31

NE

24 Oct

-1.7

18:38:42

10

NNW

18:41:23

22

NNE

18:44:03

10

E

24 Oct

-1.4

20:15:00

10

WNW

20:17:02

31

W

20:17:02

31

W

25 Oct

-3.4

19:25:47

10

NW

19:29:08

85

NE

19:30:20

37

SE

26 Oct

-2.9

18:36:40

10

NW

18:39:55

46

NE

18:43:08

10

ESE

26 Oct

-0.7

20:14:05

10

W

20:16:20

17

SW

20:16:43

17

SW

27 Oct

-1.5

19:24:16

10

WNW

19:27:15

31

SW

19:30:13

10

SSE

 

Magnitude (Mag): The Measure of brightness for a celestial object.  The lower the value is, the brighter the object will be.

Altitude (Alt):  The angle of a celestial object measured upwards from the observer’s horizon.

Azimuth (Az):  The direction of a celestial object, measured clockwise from an observer’s location with north being 0°, east being 90°, south being 180° and west being 270°. 

For information about ISS flyovers and other visible satellites, visit www.heavens-above.com

Detailed information regarding all unmanned exploration of our universe, missions past, present, and planned, can be found at Jet Propulsion Laboratories:

http://www.jpl.nasa.gov/

The Planets Visible Without A Telescope

Mars

Mars is now in the constellation Ophiuchus and rises before the Sun sets.  Mars will be seen in the southwestern skies about 20 minutes after sunset.  Mars will set by 9:18 p.m. 

Jupiter

The largest planet in the solar system is visible once again in the morning skies.  Jupiter can be found rising by 1:39 a.m. and will be easily visible by 2:10  a.m.        

Uranus and Neptune Opposition 2014

The two most distant planets in our solar system will be at their best for the next couple of months.  Neptune has already reached opposition and Uranus will reach opposition on October 7, 2014.  The opposition of a planet is when it is in opposition with the Sun.  What that means is a planet or other body such as an asteroid is seen on the opposite side of the Earth than the Sun is.  From our perspective this is when an object is at its brightest and also coincides with the object’s closest approach to the Earth.  Only objects further from the Sun than we are can be in opposition. 

Of the two planets Uranus will be the brightest.  Uranus is already appearing as a 5.8 magnitude object and will continue to brighten until October 7.  Uranus is normally a planet that requires binoculars to be seen but when the planet is nearing opposition dark sky observers can see it with the unaided eye.  Through telescopes observers will resolve Uranus into a small disk shaped object that may display a slight greenish blue color.  Large telescopes using high magnifications up to 300x might be able to discern dark and light patches called albedo features.  These features require large aperture telescopes and better than average viewing conditions to be seen. 

Uranus is currently in the constellation Pisces.  Pisces is very difficult to see in light polluted skies so it is better to start with the Great Square of Autumn.  This asterism connects the constellations Andromeda and Pegasus all of which will be seen high in the eastern sky by 10:00 p.m.  As the Great Square sits high in the east if you follow a line connecting the stars Scheat (Beta Peg) through Algenib (Gamma Peg) about the same distance that lays between the two stars you will find three stars the stand next to one another in a straight line.  The brightest of these stars is Delta Piscium.  Uranus is about four degrees south of these stars.  You will need either a desktop planetarium program or detailed star chart to help you pinpoint which star like object is Uranus. 

http://www.iau.org/static/public/constellations/gif/PSC.gif

http://www.iau.org/static/public/constellations/gif/PEG.gif

http://www.skyandtelescope.com/astronomy-news/observing-news/uranus-and-neptune-in-2014/

Neptune reached opposition on August 29, 2014.  It is now at its peak brightness of 7.8 magnitude.  This means that you will need at least binoculars to see this distant planet even when it is at its brightest.  Through binoculars Neptune will appear as a dim star like object in the constellation Aquarius.  To find Neptune first locate the bright star Fomalhaut.  About 6 to 10 degrees north of Fomalhaut you will find six bright stars that are shaped like a hyperboloid.  Scanning the sky further north you will find the star Sigma Aquarii.  Neptune will be just east of this star.      

Using a telescope most will see a star like object that when magnified enough will reveal a greyish blue disk.  Using a large telescope and high magnification up to 300x it may be possible to detect albedo features and Neptune largest moon Triton.  Triton will appear as a dim star right next to Neptune.

Like Uranus Neptune will require some kind of astronomy software of a detailed map to find.  As we pass by these planets in our orbit see if you can detect there shift amongst the background stars.  Below are a few links that will be helpful in locating Neptune and the stars mentioned above.

http://www.iau.org/static/public/constellations/gif/AQR.gif

http://www.skyandtelescope.com/astronomy-news/observing-news/uranus-and-neptune-in-2014/

Constellation of the Month

Each month we will highlight one constellation and some of the objects that can be found within the boundaries of that constellation.  At the start of the month we will list only a few of these objects and each week we will add another to the list.  Some objects will be visible to the unaided eye and some may require a telescope.  Many of the objects listed will require a map of the sky to find or may require repeat observations to notice various properties.  Links to star charts and other information that will be useful in identifying the objects listed will be given at the end of each week’s section. 

This month we will once again forego a single constellation and discuss a number of different patterns.  This month we will work on finding some of the informal groupings of stars called asterisms.  These informal patterns can be large groups that contain multiple constellations or they can be small dim groupings that require a telescope to see. Many of them serve as useful markers in the sky that help you find dimmer and more difficult objects.  

The first asterism we will cover in October is the Summer Triangle.  This is one we have mentioned and used numerous times in the night sky update.  Last week in fact we used it in reference to finding Cygnus the Swan.  Other constellations that comprise this asterism are Lyra the Harp and Aquila the Eagle.  Inside the Summer Triangle we find the constellations Vulpecula the Fox, Sagitta the Arrow and just outside the eastern edge is Delphinus the Dolphin.  Scattered throughout these constellations are many gems for double star observers, numerous open star clusters and a number of nebulas.  The first step in finding all of these is taken by first locating the Summer Triangle.

Also of interest regarding the Summer Triangle is a Mission called Kepler.  This is a space telescope that steadily observed the patch of sky between Cygnus and Lyra.  What Kepler was looking for was the subtle changes in a star’s light due to the effects of a planet orbiting around it.  Thanks to the Kepler mission and other research programs scientists currently have 5,022 candidate exoplanets (planets orbiting other stars) of which 1,746 have been confirmed.  With these numbers scientists have estimated that there are likely as many planets as there are stars in the Milky Way galaxy if not more.  If you would like to learn more about Kepler and the hunt for exoplanets visit http://planetquest.jpl.nasa.gov/   

With a name like the Summer Triangle you would think that we would start losing this asterism soon as we approach winter.  Due to the longer nights we will continue to see the Summer Triangle for the rest of the year.  Tonight go outside and simply look straight up and you should see the three bright stars Deneb, Vega and Altair that define the triangle shape.  Once you can find this asterism grab some binocular and a reclined chair and just start scanning this part of the sky.  Dense star fields and numerous stars clusters will keep you busy for some time. 

The asterism we will cover for the week of October 6 is the Great Square of Autumn.  This is another asterism that can serve as a reference point or guide post in the sky.  Much like the Summer Triangle, the Great Square of Autumn can be used to find a number of constellations and other objects of interest.  The Great Square primarily consists of two constellations; Andromeda and Pegasus.  As most of the square is in Pegasus it is also called the Square of Pegasus.  The Great Square of Autumn can also help you find the constellations Piscis, Cetus, Aquarius, Lacerta and Equuleus. 

One of the more challenging objects the Great Square can help you find is the bright variable star Mira.  Mira is a long period variable that every 333 days or so will brighten from 10th magnitude up to about 3rd magnitude.  This change does not occur in one day but over the entire 333 day cycle.  The brightening of the Mira takes about 100 days and will take twice as long to fade back to minima.  Mira was one of the first variable stars other than bright supernovas or novae to be discovered and it certainly is one of the brightest.  Unfortunately Mira has already peaked in brightness and is already well into its slow downward fade for 2014. 

Mira is an M-class red giant star that is approximately 6 billion years old.  The variable nature of Mira is due to an internal pulsation which is a result of the unstable nature of the star.  The Sun will likely come to a similar state as it evolves into a red giant star in another 5 billion years.  Mira is one of the brightest stars in the constellation Cetus.  Depending on the map you use to find Mira you may find it labeled Omicron Ceti.  

http://www.iau.org/static/public/constellations/gif/CET.gif

Finding the Great Square of Autumn is simple but it does depend on what time you look for it.  After sunset the square will be seen low in the east looking more like a diamond.  At midnight it will be nearly overhead and before sunrise it will be found low in the west. 

For the rest of the month we will cover asterisms that are still helpful guides in the sky but they will be found in individual constellations and will require an optical device such as binoculars to see.

The asterism for the week of October 13 is the star cluster known as the ET cluster.  This group of roughly 100-150 stars is frequently called the ET Cluster but officially it is named NGC 457.  The name ET Cluster is comes from the idea that the stars of NGC 457 look a bit like the famous alien character from the movie E.T.  The human brain is well suited to finding familiar patterns in a seemingly random grouping of objects.  Much like people do with clouds or blots of paint people see all kinds of patterns in the stars which of course is the theme of this month’s night sky update.  Other names given to NGC 457 are Caldwell 13 (catalog number), the Owl Cluster and the Number 5 is Alive Cluster.

The ET Cluster is located in the constellation Cassiopeia near the bright star Delta Cassiopeiae.  This 21 million year old cluster of stars is situated about 10 thousand light years away in the Perseus Arm of the Milky Way Galaxy.  When you look at it through binoculars you will see a dim patch of light with about 20 or 30 stars visible.  With telescopes you can see around 100 stars that at even such a great distance will seem detached from the background stars.  Once you are looking at the ET Cluster you will notice two bright stars called Psi-1 and Psi-2 Cassiopeiae.  These two stars represent the eyes of ET which may not be in the cluster itself.  Below the eyes there is a long chain of stars that represents ET’s arms and below that is the main body of the cluster which is seen as ET’s body. 

To find the ET cluster first find the W-shape of the constellation Cassiopeia.  The bright “W” asterism of Cassiopeia will be visible high in the northeast after sunset.  As the night progresses the “W” will pass overhead in the north and will be seen in the northwest before sunrise.  Once you can identify Cassiopeia locate the two western most stars of the W-shape called Epsilon and Delta Cassiopeiae.  Then follow a line from Epsilon to Delta and continue for another 2.5 degrees below Delta and you will find the ET Cluster.   

http://www.iau.org/static/public/constellations/gif/CAS.gif

Any you look at the ET cluster it stands out as one of the best in Cassiopeia and it sits in a crowed part of the sky in regards to other open star clusters.  If you can find the ET Cluster there are a number of open clusters within a 5 degree distance to the north.  A few of them are M103, NGC 663, NGC 654, NGC 659, NGC 436 and NGC 381.  From a dark location most of these are excellent binocular targets.        

The asterism for the week of October 20 is Kemble’s Cascade.  This is currently my favorite asterism and is one that we covered in April when talking about the constellation Camelopardalis.  I choose to return to this object for a few reasons.  First it is beautiful, second it is one of those objects that favor binoculars over telescopes and third the part of the sky it is in is loaded with lots of great objects in other constellations.  It is because of this last reason that part of the fun in observing Kemble’s cascade is in the search for it. 

This grouping of stars was discovered by an amateur astronomer named Lucian Kemble.  He was scanning Camelopardalis and noticed a string of stars that spanned about 2.5 degrees of sky.  It was later named in his honor and remains a popular target in the sparse constellation of Camelopardalis.

Kemble’s Cascade is a string of 20 stars, mostly 7th to 10th magnitude, which spans about 2.5 degrees.  The center of the string is accented with a 5th magnitude star.  The stars that make up Kemble’s Cascade are not related to each so what we see is just a chance alignment.  Following this cascade of stars to the southwest will bring us to an open star cluster called NGC 1502.  This cluster contains about 45 stars that will appear as a faint glow at the end of Kemble’s Cascade. 

One way to find Kemble’s Cascade is by first locating Beta and Alpha Cam using binoculars.  This can be done by first following the steps to find last week’s ET cluster.  The two bright stars in Cassiopeia, Delta and Epsilon Cassiopeiae will also help you find Kemble’s cascade. 

http://iau.org/static/public/constellations/gif/CAS.gif

Scan from Delta to Epsilon Cassiopeiae about 10 degrees to the northwest.  This will bring you to Gamma Cam.  Below Gamma Cam you will find Alpha and Beta Cam

http://iau.org/static/public/constellations/gif/CAM.gif

From Alpha Cam scan about 5 degrees to the east and you will find Kemble’s Cascade.

My favorite way to find Kemble’s Cascade is to first find the constellation Perseus south of the western half of the constellation Cassiopeia.

http://iau.org/static/public/constellations/gif/CAS.gif

http://iau.org/static/public/constellations/gif/PER.gif

With binoculars locate the bright star Mirfak at the center of Perseus.  This bright star is in the middle of the Alpha Persei Moving group of stars.  It is a nearby broad open star cluster that is beautiful in low power binoculars.  From here move north the helmet of Perseus to find NGC 869/884 also known as the Perseus Double Cluster.  Two degrees to the north you can find Stock 2 also known as the muscle man cluster.  A bit north and west from Stock 2 is the Heart and Soul nebulas and a scattering of dimmer open star clusters.  The Heart and Souls Nebulas are two beautiful emission nebulae that will require dark skies to be seen.  And finally another five degrees to the west you will find Kemble’s Cascade.  Now I admit that this method of finding Kemble’s Cascade seems a bit complicated and will require a more advanced map to identify all the objects just named, but it is not often you can star hop using deep sky objects instead stars.     

If you are up for a challenge and have dark skies there are even a few dim galaxies you can try to find that are north and west of Kemble’s Cascade called IC 342 and IC 356.  Unfortunately for these you will need large binoculars or a telescope to seem them. 

Our next Star Party will be held on Friday, November 7, 2014, from dusk until 10 p.m.

Weather permitting, the St. Louis Astronomical Society and the Science Center will set up a number of telescopes outdoors and be on-hand to answer your questions.  Telescope viewing begins at 8:00 p.m.  Regardless of the weather on November 7, join us indoors in our planetarium theater for “The Sky Tonight”.  Showtime is at 7 p.m.
This free, indoor star program will introduce you to the current night sky, the planets, and the seasonal constellations. Doors open 15 minutes before show time. Shows begins at 7 p.m. Sorry, no late admissions due to safety issues in the darkened theater.

The St. Louis Astronomical Society hosts the monthly Star Parties at the Science Center which are held on the first Friday of each month. Our Monthly Star Parties are open to the public and free of charge.  For more information about the St. Louis Astronomical Society visit their website at www.slasonline.org