Sharpless 252 (NGC 2174/5, IC 2159, LBN 854 and more) is a large emission nebula located approximately 6,400 light-years away in Orion.
Ha – 19x1800s – 570 minutes – binned 1x1
OIII – 18x1800s – 540 minutes – binned 1x1
SII – 18x1800s – 540 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2
1770 minutes total exposure – 29 hours 30 minutes
Imaged from Dardenne Prairie, Missouri (a red zone) over seven nights in November, 2017 with a SBIG ST-8300M on an Astro-Tech AT90EDT at f/6.7 603mm.
Note – these images have been rotated 180 degrees (north down, east right).
SII-Ha-OIII-RGB (Hubble Palette) - https://www.flickr.com/photos/dcrowson/38730406304/sizes/l
HaRGB - https://www.flickr.com/photos/dcrowson/24572148317/sizes/l
Ha-SII-OIII-RGB (modified-Hubble Palette) - https://www.flickr.com/photos/dcrowson/24572152127/sizes/l