NGC 7331, Stephan's Quintet, and Surrounding Galaxies

NGC 7331
All Images Copyright Steve Cannistra

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RA (J2000): 22h 36m 44s
Dec (J2000): +34 degrees 14' 29"
Position Angle: 90 degrees

This 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 the labeled image for galaxy identification, as well as the larger sized images for greater detail.  More information about NGC 7331 may be found on Rob Gendler's website.

Photographic Details:
Dates:  August 11, 2023.
Scope:  Takahashi FSQ106 at f5 on the Takahashi NJP Mount.
Autoguider:  ASI178 autoguider with SvBony 30mm guidescope, focal length 120mm.
Camera:  ZWO ASI294MM at -10C, with 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.
Baader Ha, R, G, B filters; 2 inch.
Image acquisition software:  MaximDL for camera control and autoguiding; CCD Commander for automation.
Exposures:  Total exposure 6 hours (Lum: 3 hours, 60 second subs; RGB 3 hours, 120 second subs).
Processing:  Calibration, integration, deconvolution (BlurXTerminator), noise reduction (NoiseXTerminator) in Pixinsight; subsequent processing in Photoshop.

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