NGC 7331, Stephan's Quintet, and Surrounding Galaxies
RA (J2000): 22h 36m 44s
Dec (J2000): +34 degrees 14' 29"
Position Angle: 90 degrees
is a widefield image of a rich galaxy field in Perseus, with the large
spiral galaxy NGC 7331 in the upper right, adorned on top with 5
smaller galaxies that are known as the "Deer Lick Group" (a name
attributed to amateur astronomer Tom Lorenzin who viewed this from the Deer
Lick Gap in North Carolina). Stephan's Quintet can be seen in
the lower left hand side of the image, forming a visual cluster of
galaxies where 4 of the 5 members represent a true galaxy group,
Hickson Compact Group 92.
Please be sure to check out
image for galaxy identification, as well as the larger sized images
for greater detail. More information about NGC 7331 may be found
Dates: August 11,
FSQ106 at f5 on the Takahashi NJP
Autoguider: ASI178 autoguider with SvBony 30mm guidescope, focal length
Camera: ZWO ASI294MM at -10C,
7 position ZWO filter wheel. Pixel size is 2.3 microns (Bin 1x1),
yielding an image scale with the FSQ (530mm focal length) of 0.90
"/pixel (well matched for my seeing of 3 arcseconds).
Camera gain set to 50 (e-gain
2.13 electrons/ADU), offset 25.
Read noise at this gain level was 2.18 electrons rms.
Ha, R, G, B filters; 2 inch.
software: MaximDL for camera control and autoguiding; CCD
Commander for automation.
exposure 6 hours (Lum: 3 hours, 60 second subs; RGB 3 hours, 120
integration, deconvolution (BlurXTerminator), noise reduction
Pixinsight; subsequent processing in Photoshop.
note: Graphics on this website may not be reproduced without
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