NGC-7331, Deer Lick Group and Stephan's Quintet (Joel Shepherd)

Celestial hemisphere: Northern · Constellation: Pegasus (Peg) · Contains: NGC 7317 · NGC 7318 · NGC 7319 · NGC 7320 · NGC 7331 · NGC 7333 · NGC 7335 · NGC 7336 · NGC 7337 · NGC 7338 · NGC 7340 · NGC 7343 · Stephan's Quintet

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NGC-7331, Deer Lick Group and Stephan's Quintet

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NGC-7331, Deer Lick Group and Stephan's Quintet

One of my favorite areas of the sky: NGC-7331 and the Deer Lick Group in the lower right corner, Stephan's Quintet in the upper left. This is about 8 hours of RGB with a touch of H-A, from late August and early September. Over the summer, Warren Keller and Matt Dahl at Cloudbreak Optics (Seattle) helped me narrow down a problem I'd been having for a while with bloated, hazy stars. It turned out to be dust and (I believe) residue from forest fire smoke that had built up on the camera sensor window. Swapping cameras made for an immediate improvement. I also tried using different exposure times for the R, G and B channels on this image, based on the sensor sensitivity, and that I regret. The red initially overwhelmed things and it took some work to tame it. Additionally, for some reason I was unable to stretch the luminance to bring out what supposedly is IFN in the background. So the luminance on this is a heavily processed version of the lightness extracted from the RGB combination (extract it, process it, and combine it back in). I think it may have contributed to the general softness in the image, but it did stretch out more satisfactorily. You'd think after 7 or 8 years of processing images, it'd get easier, but it never seems to!

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The refractors!

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Status	Advanced success
Started	...
Astrometry.net job	6434376
PixInsight job	6RVWC5JJH2GG08NM8OX39EIKCRQPZVEL
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	22h36m35s.65
RA (top/left)	22h35m31s.71
RA (top/right)	22h38m59s.23
RA (bottom/right)	22h37m40s.54
RA (bottom/left)	22h34m11s.43

Dec (center)	+34°13′10″.5
Dec (top/left)	+33°45′29″.2
Dec (top/right)	+34°05′28″.7
Dec (bottom/right)	+34°40′47″.10
Dec (bottom/left)	+34°20′44″.4

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NGC-7331, Deer Lick Group and Stephan's Quintet

NGC-7331, Deer Lick Group and Stephan's Quintet

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NGC-7331, Deer Lick Group and Stephan's Quintet

NGC-7331, Deer Lick Group and Stephan's Quintet

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