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NGC 2903 in Leo



Scope: Celestron 9.25 Edge HD 235 mm at f/7, Location: DAA Observatory, Shelter Valley, CA, 28 February 2022,  Camera: ASI294MM (Baader  LRGB Filters)

Exposure: Exposure: L - 64 x 3 minutes (gain-160 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 - Star XTerminator. 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  4092x2801.

North is up in this image.  The galaxy toward the left is NGC 2903 -  a SAB(rs)bc, a barred spiral with weak ring. It's distance is comparable by independent estimate (27.9 million light years) and by redshift estimate (39 million light years). NGC 2903 is accompanied by a smaller Magellenic irregular galaxy PGC27115 -  at a distance of 24.3 million light years (estimated by redshift).  This image also shows numerous background galaxies in this region of the sky. Two of these galaxies distance exceed one billion light years (Lookback) - ASK 591791.0 and SDSS j093041.44+212722.1 - this latter galaxy has a nearby galaxy (ASK 591128.0) that may be interacting. There seems to be a long, distorted tail on this pair. Some Quasars  are also visible in this image as well. The visible Quasars range from 2.48 to 11.1 billion light years (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 arc minutes. Full size image scale is approximately 0.58 arcsec/pix.. 

Image center is approximately - Equatorial 2000: RA: 09h 31m 35s Dec: +21 28' 57"


All images and content remain the property of Jim Thommes - copyright 2003 - 2022

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