Arp 189 (NGC 4561, UGC 7901, VV 56, the Umbrella Galaxy and others) is a spiral that probably captured another in the past. It is located, based on the latest study, 93 million light-years away in Coma Berenices. Arp lists this one in his ‘galaxies with narrow filaments’ class.
Luminance – 24x600s – 240 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2
360 minutes total exposure – 6 hours
Imaged April 28th and 30th, 2019 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/47884882811/sizes/l