Sharpless 187 (LBN 630) is an emission nebula partially obscured by LDN 1317. It is looked approximately 4,500 light-years away in Cassiopeia.
Luminance – 12x600s – 120 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2
240 minutes total exposure – 4 hours
Imaged from Dardenne Prairie, Missouri (a red zone) on August 19th and September 19th, 2015 with a SBIG ST-8300M on an Astro-Tech AT90DT at f/6.7 603mm.
LRGB - https://www.flickr.com/photos/dcrowson/21547488276/sizes/l
I also shot 6 hours of Ha but it really didn’t add anything to the image so I went ahead and collected luminance.