Arp 6 (NGC 2537, UGC 4274, VV 138, Bear Paw or Claw galaxy and many others) is a blue compact dwarf (BCD) galaxy located approximately 22.5 million light-years away in Lynx. Arp lists this on in his “Spiral galaxies – low surface brightness” class.
NGC 2537A (MCG+08-15-051, PGC 23057 and others is the small left (east).
Luminance – 24x600s – 240 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2
360 minutes total exposure – 6 hours
LRGB - https://www.flickr.com/photos/dcrowson/40703127764/sizes/l
Imaged March 20th and April 6th, 7th, 8th and 9th, 2018 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.