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NGC 4725 in Coma Berenices



Scope: FSQ-106N at f/8- w/ Q-Telex, Location: DAA Observatory, Shelter Valley, CA, 14 and 15 April 2023, Camera: ASI2600MM (Astronomik type 2c LRGB, filters)

Exposure: L - 101 x 4 minutes (gain-101 1x1) ,  RGB - 32 each x 3.5 minutes  - (gain-101 1x1).

Processing: Data Collection -  Sequence Generator Pro (as FITs).  Sub-frame calibration - Pixinsight (WBPP). Sub-frame  registration and integration (Average combine -  Winsorized  Clipping Rejection) - 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 6248x4176 resolution. Final Image size is approximately  6033x4074.

North is up in this image.  This image shows NGC 4725 - classed SAB(r)ab pec - at a distance of about  69 million light years. Along with NGC 4725 is its paired galaxy NGC 4747 (also known as Arp 159) - classed SBcd pec edge-on. Finally, there is a small dwarf  galaxy of NGC 4725 -ASK 667300.0 (LEDA 43595). The three galaxies comprise the galaxy group NGC 4752/47 Group. At the further distance of  213 million light years is the galaxy NGC 4712 -  classed SA(s)bc. On the upper edge of the image are several compact galaxy groups with 2.9 to 4.0 billion years of light travel time (Lookback). The furthest objects visible in this image are the Quasars  -  many have light travel time distance over 10 billion years - the highest of these has a light travel time of 11.68 billion years and a redshift of 3.178.  These objects, information,  and some of the brighter stars are identified in the annotated image This image replaces an earlier 2012 image in the Archives here. Horizontal FOV is approximately 100 arc minutes. Full size image scale is approximately 0.99 arcsec/pix.

Image Center approximately - Equatorial 2000: RA: 12h 50m 20s Dec: +2529'34"


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

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