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NGC 7640 with Faint Foreground Cirrus



Scope: Celestron 9.25 Edge HD 235 mm at f/7, Location: DAA Observatory, Shelter Valley, CA, 26 and 29 August 2022,  Camera: ASI294MM (Baader  LRGB Filters)

Exposure: L - 64 x 4 minutes (gain-121 2x2) ,  RGB - 20 each x 2 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  4000x2710.

North is up in this image.  The dominant feature in this image is the barred spiral galaxy - SB(s)c - NGC 7640. It is about 26 million light years distant and it lies in a relatively dense Milky Way star field. Also of interest is the faint cirrus nebulosity in the foreground (along with the stars). There are numerous background galaxies - many can be seen in the full size image. Many of these galaxies have limited representations in well known catalogs., but a few have measured redshifts with extrapolated  distances  in the 2 billion light year range (by light travel time, Lookback).  The furthest objects are a few Quasars - the three visible in this image are from 4.28 to 9.17 billion years (Lookback).  These objects, information, background galaxies, and some of the brighter stars are identified in the annotated image Horizontal FOV is approximately 39.5 arc minutes. Full size image scale is approximately 0.59 arcsec/pix.

Image Center approximately - Equatorial 2000: RA: 23h 22m 07s Dec: +4049'32"


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

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