NGC 536 (UGC 1013, PGC 5344, HCG 10a and others) is the AGN spiral at the center of the image. It is located approximately 210.6 million light-years away in Andromeda.
NGC 531 (UGC 1012, PGC 5340, HCG 10c and others) is the odd spiral above NGC 536 located at a similar distance.
NGC 529 (UGC 995, PGC 5299, HCG 10b and others) is the E/S0 (lenticular / intermediate spiral) to the right (west) of NGC 536. It located approximately 171 million light-years away.
NGC 542 (PGC 5360, HCG 10d and others) is the somewhat edge-on spiral below NGC 536.
Collectively, these make up Hickson Compact Group 10 (HCG 10).
The bright star near the bottom center (HD 8673) has a confirmed exoplanet – HD 8673b - http://exoplanet.eu/catalog/hd_8673_a_b/.
Luminance – 24x600s – 240 minutes – binned 1x1
RGB – 12:9:10x300s – 60:45:50 minutes each – binned 2x2
395 minutes total exposure – 6 hours 35 minutes
Imaged October 18th and November 10th and 11th, 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/51521243615/sizes/l/