Holmberg 6 Galaxy Group, NGC 67-72

CLICK ON IMAGE FOR FULL SIZE VIEW (6113x4158)

Scope: Celestron 9.25 Edge HD 235 mm at f/7; Location: DAA Observatory, Shelter Valley, CA;  Dates:  15 September, 8, 13 October 2023; Camera: ASI294MM (Baader  L, RGB Filters)

Exposure:   Lum 112 x 3. minutes (gain-121 2x2), RGB - 40 each x 2 minutes  - (gain-121 2x2).

Processing: Data Collection -  N.I.N.A. (as FITs).  Sub-frame calibration - Pixinsight (WBPP). Sub-frame  registration and integration (Average combine -  Winsorized sigma clipping,  2X drizzle for  Lum) - PixInsight (WBPP).  NoiseXTerminator (RGB, Lum) - PixInsight.  Non-linear stretching for Lum - PixInsight.    RGB combine and stretching, Photometric RGB calibration (SPCC)  - PixInsight. De-convolution - BlurXTerminator (AI4) - PixInsight. Generation of starless  Lum and RGB image for later processing - StarXTerminator  (PixInsight.)    Lum stars (lower stretch) screened into Lum starless  for star size control - PixInsight.  Luminance  construction layered onto RGB - Pixinsight. Final finishing  - Affinity Photo.  Annotation - PixInsight, Aladin (Simbad), and Affinity Photo. This image is a RGB image with Luminance Layering.  Image processed at 8288x5644 resolution (2x drizzle stacks). Cropped Image  above is resampled for page view; Full Field image size is approximately 6113x4158.

North is up in this cropped image.  It is a close up image of the Holmberg 6 Galaxy Cluster. The cluster consists of NGC 67 through NGC 72 and is also known as Arp 113. The full view image can be seen by clicking on the image. These cluster members range from 268 to 392 million light years, so this is more of an 'optical' cluster rather than an interactive one. The full field image shows this cluster lies in a fairly rich galaxy field with other notable galaxies - NGC74, NGC76, UGC166 and many other background galaxies.  

Also in the image are multiple Quasars. They range from  7.95 to 11.62 billion years of light travel time (Lookback). The furthest Quasar at 11.62 billion years of light travel time has a redshift of 3.096.  These objects, information, and some of the brighter stars are identified in the annotated image.   The Horizontal Full FOV is approximately 0.665 degrees. Full size image scale is approximately 0.391 arcsec/pix.

Image Center approximately - Equatorial 2000: RA: 00h 18m 20s Dec: +30°04'32"

All images and content remain the property of Jim Thommes - copyright 2003 - 2024

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