Date Posted: 6/25/2024
Date Taken: 3/2/2016, 3/8/2016, 3/9/2016
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: SSAG, Celestron 80mm guide scope, 600mm.
Exposure: LRGB 190:85:85:75 All subs 5min. Luminance unbinned, RGB binned 2x2.

Calibrated and Stacked with CCDStack2; RGB combine and DDP with MaximDL. Processed with CS4.

NGC 4236, also catalogued as Caldwell 3, is a barred spiral galaxy in Draco. It is part of the M81 galaxy group, with a distance of 14.5 million light years. It's large physical size (140,000 light years) and relatively close distance (at least as galaxies go) yields a generous apparent size (22 arc-minutes), and relatively low surface brightness.

This is a modest re-process of an image originally taken in 2016.