Arp 78 (NGC 772, UGC 1466 and others) is an unbarred spiral approximately twice the size of our Milky Way, located around 130 million light-years away in Aries. It is interacting with NGC 770 (UGC 1463 and others), a dwarf elliptical at the center of the image.
Luminance – 24x600s – 240 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2
360 minutes total exposure – 6 hours
Imaged January 22nd, 26th, 27th and 28th, 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/34122634105/sizes/l