Arp 263

Posted by dcrowson
on Sunday, November 29, 2020
Arp 263 (NGC 3239, UGC 5637, PGC 30560, VV 95 and others) is an irregular galaxy approximately 29.75 million light-years away in Leo. Arp has this one in his ‘Irregular Clumps’ class. Probably the result of the merger of a couple galaxies in the past, this one was discovered by William Herschel March 21, 1784. There’s a good paper on the structure of this galactic train wreck here - Thanks go to mentor Rick Johnson ( for pointing out the paper.

Luminance – 24x600s – 240 minutes – binned 1x1
RGB – 12x300s – 60 minutes each – binned 2x2

420 minutes total exposure – 7 hours

Imaged January 18th and 22nd, 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 annotated -
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