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NGC 467, NGC 470, NGC 474



Scope: Celestron 9.25 Edge HD 235 mm at f/7, Location: DAA Observatory, Shelter Valley, CA, 24 October 2022,  Camera: ASI294MM (Baader  LRGB Filters)

Exposure: L - 68 x 3.5 minutes (gain-150 2x2) ,  RGB - 20 each x 2.5 minutes  - (gain-121 2x2).

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Sub-frame calibration - Pixinsight (WBPP). Sub-frame  registration and integration (Average combine -  Winsorized Sigma Clipping) - PixInsight (WBPP).  Mure Denoise - PixInsight.  Non-linear stretching, normalization and gradient removal - PixInsight.   Curves, Levels, RGB combine, Luminance layering - PixInsight. Generation of starless Luminance image for later processing - StarXTerminator. Photometric RGB calibration (SPCC) - PixInsight.  De-convolution - BlurXTerminator.  Final finishing  - Affinity Photo.  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  3260x2212.

North is up in this image.  This image shows three dominant galaxies - NGC 467, NGC 470, and NGC 474. Two galaxies, NGC 470 - SA(rs)b and NGC 474 - SA0^0(s), form a galaxy pair - they have similar velocities, redshift and distance estimates.  Two galaxies, NGC 467  - SA0^0(s) pec and NGC474 have peculiar shapes. These three galaxies range in distance from 92 to 235 million light years.  Two background galaxies  - PGC 4765 (88 million light years) and PGC 4755 (245 million light years)  are in the distance range of the three dominant galaxies. Other background galaxies  are further in estimated distance.  The furthest objects are the Quasars and their distances range from 2.482 to 12.26 billion years (Lookback).  These objects, information, background galaxies, and some of the brighter stars are identified in the annotated image Horizontal FOV is approximately 38.75 arc minutes. Full size image scale is approximately 0.73 arcsec/pix.

Image Center approximately - Equatorial 2000: RA: 01h 19m 46s Dec: +0319'22"


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