CLICK ON IMAGE FOR FULL SIZE VIEW (5360x3642)

Scope: Celestron 9.25 Edge HD 235 mm at f/7; Location: DAA Observatory, Shelter Valley, CA;  Dates:  1, 3, 7 May 2024; Camera: ASI294MM (Baader  LRGB Filters)

Exposure:   Lum 112 x 3.5. 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 -  Linear fit 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 RGB stars  for star size control - PixInsight.  Starless Luminance  LRGB combined to RGB starless - Pixinsight. LRGB stars screened to LRGB starless - PixInsight Final finishing  - Affinity Photo.  Annotation - PixInsight, Aladin (Simbad), and Affinity Photo. This image is an LRGB image.  Image processed at 8288x5644 resolution (2x drizzle stacks). Full Field image size is approximately 5360x3642.

 North is left in this image. This is a Galaxy Double-Double image of the NGC 5775/5774 and IC 1067/1066 galaxy pairs.  The NGC 5774/5774 pair is also known as the Holmberg 685 pair; IC 1067/1066 is also known as the Holmberg 684 pair. All of these galaxies are between 71 to 76 million light years distant by redshift estimate. All are spiral galaxies; NGC 5775 is seen edge-on. Visually smaller galaxies - IC 1068 and IC 1070 are also seen; their distances are about 386 million light  years and 378 million light years respectively (by redshift estimate).

There are several background galaxies ranging from 375 to 615 million light years (ASK 101768.0, ASK 101786.0, ASK 101782.0, ASK 101725.0, ASK 101730.0, ASK 101736.0, and ASK 101734.0). Several other galaxies from the PGC catalog can also be identified. 

The mouse-over starless image shows many of these distant background galaxies (isolated from the MW galaxy stars). There are also nine Quasars visible in this image. The Quasar SDSS J145328.52+0131329.0 is the furthest (of the Quasars ID'd) and has a light travel time (Lookback) of 10.76 billion years and has a redshift of 2.246  These objects, information, 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. The Horizontal Full FOV is approximately 0.668 degrees. Full size image scale is approximately 0.448 arcsec/pix.