NGC 1931 (Sh2-237) in Bi-Color (Dec. 2019)

To the H-alpha, I added 6.5 hours of OIII, for a total of 13 hours.  This is a combination of those two stacks of data, with a synthetic green channel used to create a color image.  There is precious little OIII data in this object.  The stars there are too new to generate much loose oxygen that can be ionized.