Messier 71 (NGC 6838) is a Shapley-Sawyer class X-XI (http://en.wikipedia.org/wiki/Shapley%E2%80%93Sawyer_Concentration_Class) globular cluster located approximately 13,000 light-years away in Sagitta.
Luminance – 24x600s – 240 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2
360 minutes total exposure – 6 hours
Imaged September 11th, 12th and 14th, 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/37248434885/sizes/l
See my wider, refractor image here - https://www.flickr.com/photos/dcrowson/20005435454/sizes/l.