Berkeley 29 (oddly, UGC 3583, MCG+03-18-002 and others) is a trumpler (https://en.wikipedia.org/wiki/Trumpler_classification) class II 3 r open cluster located approximately 72,000 light-years away in Gemini. A 2004 paper (https://arxiv.org/pdf/astro-ph/0408078.pdf) suggests that this is the most distant open cluster known.
Luminance – 24x300s – binned 1x1 – 120 minutes
RGB – 8x180s – 24 minutes each – binned 2x2
182 minutes total exposure – 3 hours 2 minutes
Imaged December 20th and 31st, 2019 and January 27th and February 1st, 2020 from Dark Sky New Mexico at Rancho Hidalgo (Animas, New Mexico) with a SBIG STF-8300M on an Astro-Tech AT12RCT at f/8 2432mm.
LRGB - https://www.flickr.com/photos/dcrowson/49479404026/sizes/l/