Sharpless 33 (LBN 37) is a very faint nebula located approximately 359 light-years away in Serpens. Being one of the oddities, it doesn’t appear to have any Ha component.
Luminance – 12x600s – 120 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2
240 minutes total exposure – 4 hours
Imaged on May 21st, 2017 at the Danville Conservation Area (New Florence, Missouri) with a SBIG ST-8300M on an Astro-Tech AT90EDT at f/6.7 603mm.
LRGB - https://www.flickr.com/photos/dcrowson/34460929070/sizes/l