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NGC 891 and Abell 347 Galaxy Cluster



Scope: Explore Scientific MN152 at f/4.8, Location: DAA Observatory, Shelter Valley, CA, 6 and 30 September 2021  Camera: ASI294MM (Baader  LRGB Filters)

Exposure: Exposure: L - 64 x 5 minutes (gain-150 2x2) ,  RGB - 20 each x 3 minutes  - (gain-121 2x2).

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Sub-frame calibration - Pixinsight. Sub-frame  registration and integration (Average combine -  Winsorized Sigma Clipping) - PixInsight.  Mure Denoise - PixInsight.  Non-linear stretching, normalization and gradient removal - PixInsight.   Curves, Levels, RGB combine, Luminance layering - PixInsight.  Final finishing  - Affinity Photo.  Photometric RGB calibration - PixInsight. Annotation - PixInsight, Aladin (Simbad and NED), and Affinity Photo. This image is a  LRGB with luminance layering.  Image processed at 4144x2822 resolution. Final Image size is approximately  4000x3000.

North is up in this image.  The galaxy upper right  is NGC 891 -  a SA(s)b? edge-on galaxy. It's distance is comparable by independent estimate (31.3 million light years) and by redshift estimate (34.1 million light years). This image also shows the Abell 347 galaxy group in this region of the sky. Group members include NGC 898, 906, 909, 910, 911, 912, 913, 914, and 923. This field has numerous  background galaxies which are visible in this image.  Some Quasars  are also visible in this image as well. The visible Quasars range from 3.51 to 10.8 billion light years lookback.   These objects, information, background galaxies and some of the brighter stars are identified in the annotated image. Horizontal FOV is approximately 89 arc minutes. Full size image scale is approximately 1.30 arcsec/pix.. 

Image center is approximately - Equatorial 2000: RA: 02h 24m 08s Dec: +42 09' 34"



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