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NGC 672 and IC 1727 - A Galaxy Pair



Scope: Celestron 9.25 Edge HD 235 mm at f/7, Location: DAA Observatory, Shelter Valley, CA, 27 September 2022,  Camera: ASI294MM (Baader  LRGB Filters)

Exposure: L - 68 x 3 minutes (gain-130 2x2) ,  RGB - 20 each x 2 minutes  - (gain-101 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  3991x2808.

North is up in this image.  This image shows a pair of spiral galaxies, NGC 672 and IC 1727. The upper of the two galaxies is NGC 672 - SB(s)cd; the lower is IC 1727 - SB(s)m -  a barred Magellanic spiral. The latter being kind of clumpy  with irregular, barely distinguishable arms. Both galaxies have pretty similar distance estimates in both redshift and Tulley-Fisher - 22 to 26 million light years. There are three pretty distinct edge on galaxies  (LEDA 181156, PGC 6632, and 2MFGC 01344). These are in the distance range of about 480 million light years by redshift estimate.  Galaxy LEDA 1806558 is also in this field at a further distance of 1,161 million light yearsThere are numerous background galaxies that can be seen in the full size image.  The furthest objects are the Quasars and their distances range from 6.59 to 11.78 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 0.59 arcsec/pix.

Image Center approximately - Equatorial 2000: RA: 01h 47m 46s Dec: +2725'08"


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

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