NGC 7331 and Deer Lick Group
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ON IMAGE FOR FULL SIZE VIEW (2600x1950)
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: +34°31'12"
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