Arp 280 consists of NGC 3769 (UGC 6595 and others), the large galaxy interacting with NGC 3769A (MCG+08-21-077 and others) below and to the left (east). Found in Arp’s ‘Double Galaxies – Interacting’ class, these are located approximately 45 million light-years away (http://simbad.u-strasbg.fr/simbad/sim-ref?bibcode=2016AJ....152...50T) in Ursa Major.
UGC 6576 is the barred spiral at the bottom right.
Luminance – 24x600s – 240 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2
360 minutes total exposure – 6 hours
Imaged April 15th, 17th and 20th, 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/49818137558/sizes/l/