Date Posted: 3/22/2023
Date Taken: Three nights from 2/23 thru 3/19/2023
Scope: Planewave CDK 12.5 f/8, 2541mm
Camera: SBIG STL-11000 with Astrodon Tru-Balance E-Series Gen2 filters
Temp: - -15C
Mount: Losmandy Titan
Guiding: On-axis via ONAG-XM and SX UltraStar at 2541mm. FocusLock real-time focus for focusing.
Exposure: LRGB, 330:115:115:115. Luminance 15min unbinned; RGB 5min binned 2x2.

Calibrated and Stacked with CCDStack2 and MaximDL. Processed with CS4.

Hickson 61, also known as 'The Box'. is the central group of 4 galaxies in this image. NGC 4173 is the larger, bluish galaxy; clockwise from there, the others are NGC 4175, NGC 4174, and NGC 4169. NGC 4173 is at a distance of ~50 million light years, whereas the other 3 are all at a distance of about 180 million light years. The elliptical at upper right is UGC 7190. What looks like a star cluster near the bright star on the left is actually Abell 1495, a galaxy cluster of over 100 galaxies approximately 1.7 billion light years away.