Arp 303 consists of IC 564 (UGC 5230 and others), the spiral left (east) of center and IC 563 just below it. Both are approximately 275 million light-years away in Sextans.
IC 561 is the odd-looking spiral just above center.
UGC 5224 is the low surface brightness galaxy at the bottom center.
Luminance – 24x600s – 240 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2
360 minutes total exposure – 6 hours
Imaged April 14th, 15th and 17th, 2017 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/33988174492/sizes/l