Sharpless 170 (LBN 577, possibly DG 192 and others) is an emission nebula located approximately 7,500 light-years away in Cassiopeia. The cluster of stars is designated as Stock 18.
Ha – 18x1800s – 540 minutes – binned 1x1
OIII – 18x1800s – 540 minutes – binned 1x1
SII – 18x1800s – 540 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2
1740 minutes total exposure – 29 hours
Imaged from Dardenne Prairie, Missouri (a red zone) on September 7th, 9th, 10th, 14th and 15th, 2017 with a SBIG ST-8300M on an Astro-Tech AT90EDT at f/6.7 603mm.
OIII-Ha-SII-RGB (Hubble Palette) - https://www.flickr.com/photos/dcrowson/29139347787/sizes/l
Ha-OIII-SII-RGB - https://www.flickr.com/photos/dcrowson/29139346657/sizes/l
HaRGB - https://www.flickr.com/photos/dcrowson/29139348497/sizes/l