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ASTRO: Sh2-187



 
 
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  #1  
Old September 5th 10, 06:38 PM posted to alt.binaries.pictures.astro
Glen Youman
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Posts: 177
Default ASTRO: Sh2-187

SH2-187
Cassiopeia
Penryn, California
September 2010
FS-128 (ag, ST-4)
ST-2000XM LRGB 10 minute subs

Sh2-187 is a complex area of gas, molecular clouds and dust.
Multifrequeny studies indicate the HII region is fragmented and still
partially encased in the parental cloud out of which it was born some
200,000 years ago. Only 3 percent of the HII region is optically
visible and is ionized by a BO class star with a magnitude of 0.5. The
molecular cloud covers approximately 1 degree. Numerous IR point
sources are embedded within the complex, one source is most likely an
H2O maser and the remainder are either proto stars or stars. (Joncas,
et.al. 1992)


I keep bumping against sky background on these faint objects.


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  #2  
Old September 5th 10, 07:43 PM posted to alt.binaries.pictures.astro
Rick Johnson[_2_]
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Posts: 3,085
Default ASTRO: Sh2-187

On 9/5/2010 12:38 PM, glen youman wrote:
SH2-187
Cassiopeia
Penryn, California
September 2010
FS-128 (ag, ST-4)
ST-2000XM LRGB 10 minute subs

Sh2-187 is a complex area of gas, molecular clouds and dust.
Multifrequeny studies indicate the HII region is fragmented and still
partially encased in the parental cloud out of which it was born some
200,000 years ago. Only 3 percent of the HII region is optically
visible and is ionized by a BO class star with a magnitude of 0.5. The
molecular cloud covers approximately 1 degree. Numerous IR point
sources are embedded within the complex, one source is most likely an
H2O maser and the remainder are either proto stars or stars. (Joncas,
et.al. 1992)


I keep bumping against sky background on these faint objects.


That's one I've been meaning to revisit since I replaced my filters with
ones with far less reflections. I was killed by them, especially in the
blue. Now all I need is clear skies. They continue to be in very short
supply.

To me this one looks a bit like a spider

Rick

--
Correct domain name is arvig and it is net not com. Prefix is correct.
Third character is a zero rather than a capital "Oh".
 




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