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NGC 637

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#1 cildarith



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Posted 07 January 2010 - 10:52 AM

Object Name: NGC 637
Also Known As: H.VII.49, Cr 17, Lund 51, OCl 329, C0139+637
Object Type: Open Cluster
Constellation: Cassiopeia
Right Ascension (2000.0): 01h 43m 03.1s
Declination (2000.0): +64° 02' 12"
Magnitude: 8.2
Diameter: 3.0'
Trumpler Type: I 2 m
Distance: 6,900 light years
Discovery: William Herschel, 9 November 1787 (18.7" reflector)
NGC Description: Cl, pS, B & vF st

Telescope: Parks Astrolight EQ6 • 6" f/6 Newtonian Reflector
Eyepiece/Magnification: 7.5mm Parks Gold Series Plössl • 120x • 26' FoV
Date/Time: 16 November 2009 • 05:45-06:30 UT
Observing Location: Oakzanita Springs, San Diego Co., CA
Transparency: NELM 6.4, TLM 14.2
Seeing: Pickering 7-8
Conditions: Clear, cold, dry, some wind

NGC 637 is a small, but surprisingly distinct open cluster located just over 1 degree northwest of Epsilon Cassiopeiae, the easternmost star of the famous "W" asterism. This cluster is strongly condensed with a prominent pair of 10th and 11th magnitude stars at the center of the cluster, designated Struve I (1st supplement) 264 (10.2, 11.4; 9.0"; 352°; both white). Numerous companions, both bright and very faint (as the NGC put it), surround this pair. Outliers streaming away in graceful arcs to the north and west give this cluster an aesthetically pleasing crescent shape. The cluster is followed by a wide pair of 11th magnitude stars located about 3' to the east. The brightest field star in the 26' field of view provided by the 7.5mm Plössl is 8th magnitude HD 10304, notable for its orange hue and lying 6½' to the SSW. William Herschel discovered this cluster with his 18.7" speculum metal reflector on November 9, 1787.

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#2 Jef De Wit

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Posted 07 January 2010 - 11:27 AM

Nice report and sketch as always! Still waiting for the book :)

#3 starquake


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Posted 07 January 2010 - 11:29 AM

Wow, looks very sweet! I wonder why I haven't seen this cluster yet. Have you tried some higher magnification? Did it help to reveal more faint members?

Thanks for sharing!

#4 blb



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Posted 07 January 2010 - 12:05 PM

I love your sketches. With all the information they are wonderful. I too would buy a copy of a book of your sketches with the info. Perhaps self publishing and selling in the classifieds what you have to date. I know that trying to complete what ever agenda you have for observing for a book deadline can take the fun out of your hobby, so I would not recommend doing that. Hobby first then book. Anyway thanks for sharing these.

Clear skies, Buddy

#5 frank5817



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Posted 08 January 2010 - 12:16 AM


Beautiful capture. It does not take a large telescope to capture these beautiful open clusters in Cassiopeia. But it does take much skill to draw them so well. :bow: :rainbow:

Frank :)

#6 cildarith



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Posted 08 January 2010 - 12:43 AM

Thanks for the comments! :)

Jef: There's that "b-word" again...

Ferenc: I hope you have a chance to view NGC 637, it is a pretty little thing and relatively obscure. You are correct that a little more magnification would have likely revealed additional members and framed the sketch a little better - maybe next time...

Buddy: Yeah, the desire for "completeness" (whatever that means) in whatever is published coupled with mild OCD regarding my own work would probably be a real drag.

Frank: Thanks man! It's easier than moon-craters... ;)

#7 JayKSC



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Posted 08 January 2010 - 01:09 PM


Thank you for posting your stunning sketch! I particularly like how you render the stars - viewing your sketch makes it seem that I'm peering through a telescope.

- Jay
South Florida

#8 Shannon s

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Posted 08 January 2010 - 03:05 PM

Great sketch Eric. Have you done anymore stippling lately? Or is it too much of a headache? :roflmao:

#9 JayinUT


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Posted 08 January 2010 - 09:09 PM


I love your framing of your sketches, especially your open clusters. Fantastic capture and I can gather a hint of nebulosity around the stars or is that just a dirty monitor screen?

#10 markseibold


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Posted 08 January 2010 - 10:58 PM


Beautiful sketch. :bow: :bow: :bow: Your technical text is also enjoyable to read. I always learn something from your information. It is enlightening to know that I have probably not intentionally observed this open cluster for years but might have swept over it years ago one night not even knowing that it was cataloged long ago, then to see your historical text that Herschel discovered it in 1787!

Thanks for posting and sharing,


#11 CarlosEH



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Posted 09 January 2010 - 01:58 AM


A beautiful observation of NGC 637. This is an attractive open cluster in Cassiopeia. Thank you for sharing it with us all.


#12 cildarith



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Posted 11 January 2010 - 12:06 AM

Thanks everyone!

Jay: Capturing the view through the eyepiece is the effect I try to create with my sketches, so thank you for the comment.

Shannon: I certainly intend to stipple the moon again in the future, hopefully sooner than later...

Jay: Yes, there was a hint of nebulosity - the result of unresolved stars - misting the region around the cluster and I attempted to render that in the sketch.

Mark: The pleasure is mine, I'm glad you enjoyed it.

Carlos: Thank you! :)

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