Messier 37 (NGC 2099) is a large open cluster located approximately 4,500 light-years away in Auriga.
Luminance – 12x300s – binned 1x1 – 60 minutes
RGB – 10x180s – 30 minutes each – binned 2x2
150 minutes total exposure – 2 hours 30 minutes
Imaged January 7th, 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/32070352521/sizes/l
My wide-field image that was in the May, 2016 issue of Astronomy Magazine, can be seen here - https://www.flickr.com/photos/dcrowson/22846721339/sizes/l.