Sharpless 146 (LBN 514) is a HII region split by a dark nebula. It is looked approximately 16,000 light-years away in Cepheus.
Ha – 24x1800s – 720 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2
840 minutes total exposure – 14 hours
Imaged over four nights in October and November, 2016 at Dark Sky New Mexico at Rancho Hidalgo (Animas, New Mexico) with a SBIG STF-8300M on an Astro-Tech AT12RCT at f/8 2432mm.
HaRGB - https://www.flickr.com/photos/dcrowson/30969744466/sizes/l