Sh2-290 (Abell 31, PK 219+31 1, PN G219.1+31.2 and others) is a large planetary nebula located approximately 1770 light-years away in Cancer.
Ha – 37x1800s – 1110 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2
1230 minutes total exposure – 20 hours 30 minutes
Imaged over eleven nights in January, 2018 through March, 2021 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.
HaRGB - https://www.flickr.com/photos/dcrowson/52203947925/sizes/l/