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NGC 7331 and Deer Lick Group



Scope: Celestron 9.25 Edge 235 mm at f/7, Location: Tierra Del Sol - SDAA Club Site, CA,  13 July 2018  Camera: ST8300M (Baader LRGB filters)

Exposure: Exposure:  16 x 10 min (2x2 bin) exposure with IR/UV Block filter, 10 x 4 min (3x3 bin) RGB exposures.

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Calibrated, stacked (Kappa Sigma Combine) - Deep Sky Stacker. LRGB channel registration, equalization, gradient removal - Astroart.  Curves, Levels, RGB combine - ImagesPlus. Luminance Layering, final stretch, and finishing  - Photoshop.  RGB calibration - eXcalibrator. This image is a  RGB combine with Luminance layering.  Color saturation in LAB color.  The IR/UV Blocking filter exposure stack was used for the luminance layer. High pass sharpening applied. Images processed at 3352 x 2532 resolution. Final Image size is approximately  2600 x 1950.

North is up in this image.   NGC 7331 is the dominant galaxy in this field. It is the brightest member of the Deer Lick Group - consisting of NGC 7331 and the smaller galaxies NGC 7335, 7336, 7337, 7340. This is an optical grouping since NGC 7331 is  much less distant (46 mly) than the other four (260+ mly). NGC 7335, 7337, 7340 are actually members of the physically associated group HDC 1198 (centered 268 mly distant). A 2012 paper, Giant GAlaxies, Dwarfs, and Debris (GGADDS), identified satellite dwarfs associated with NGC 7331. These are identified as NGC 7331 A, B, C, and D.  There are also a number of background galaxies in this field. These galaxies  are identified in the annotated image..  This image replaces an earlier image in the Archives here.   Horizontal FOV is approximately 38 arc minutes (0.87 arcsec/pix image scale on the full size image).

Image center is located approximately - Equatorial 2000: RA: 22h 37m 28s Dec: +3431'12"


All images and content remain the property of Jim Thommes - copyright 2003 - 2018

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