Arp 26 (M101, NGC 5457, UGC 8981, VV 344 / 344a / 456 and others) is a spiral galaxy located approximately 21 million light-years away in Ursa Major. It is part of Arp’s “Spiral galaxies with one heavy arm” class.
Luminance – 24x600s – 240 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2
360 minutes total exposure – 6 hours
Imaged April 29th and 30th and May 1st and 2nd, 2016 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/39366765562/sizes/l
I also captured around 10 hours of Ha data but never used it. I’m not overly happy with the results on this image – part of the reason why it has taken so long to post. If you have an interest, I can supply component FITs files.