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NGC 5921 in Serpens



Scope: Celestron 9.25 Edge HD 235 mm at f/7, Location: DAA Observatory, Shelter Valley, CA, 30 April and 3 May 2022,  Camera: ASI294MM (Baader  LRGB Filters)

Exposure: Exposure: L - 80 x 4 minutes (gain-121 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  4000x2714.

North is up in this image.  The dominant galaxy toward the left is NGC 5921 -  an SB(r)bc morphology. It is a barred spiral with a strong ring. It's distance by independent estimate is 56.4 million light years and by redshift estimate is 76 million light years. Background galaxies to the right (PCG1277644, PGC1275985, and ASK 466800.0) are at very similar redshift distance of 602 to 607 million light years. Other ASK cataloged galaxies in the background are from 1,200 to 1,300 million light years. Quasars visible in this image are from  5.05 to 11.1 billion years (Light Lookback).  These objects, information, background galaxies and some of the brighter stars are identified in the annotated image. This image replaces an earlier image that can be seen in the Archives here.  Horizontal FOV is approximately 39.5 arc minutes. Full size image scale is approximately 0.59 arcsec/pix.

Image Center approximately - Equatorial 2000: RA: 15h 21m 54s Dec: +0504'14"


All images and content remain the property of Jim Thommes - copyright 2003 - 2023

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