Arp 31 + NGC 691

Posted by dcrowson
on Friday, January 26, 2018

Arp 31 (IC 167, UGC 1313 and others) is a barred spiral galaxy approximately 61 million light-years away in Aries. This one is in the ‘Integral sign spiral galaxies’ class.

NGC 694 (UGC 1310 and others) is a starburst galaxy above Arp 31. Articles suggest it is interacting with Arp 31 but more recent distance estimates put it at it at approximately 130 million light-years way.

NGC 691 (UGC 1305 and others) is the delicate spiral at the bottom center of the image. It is approximately 130 million light-years away.

Luminance – 24x600s – 240 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2

360 minutes total exposure – 6 hours

Imaged December 8th, 9th and 12th, 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.


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