Arp 81 consists of NGC 6621 (UGC 11175 N, VV 247a and others) located above NGC 6622 (UGC 1175 S, VV 247b and others). Part of Arp’s Spirals with large, high surface brightness companions class, these are located approximately 310 million light-years away in Draco.
Luminance – 24x600s – 240 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2
360 minutes total exposure – 6 hours
Imaged June 8th, 10th and 23rd, 2019 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/48656191501/sizes/l