NGC 6914 - A nebula in Cygnus

From NASA APOD page: The interstellar complex of nebulae lies some 6,000 light-years away, toward the high-flying northern constellation Cygnus and the plane of our Milky Way Galaxy. Obscuring interstellar dust clouds appear in silhouette while reddish hydrogen emission nebulae, along with the dusty blue reflection nebulae, fill the cosmic canvas. Ultraviolet radiation from the massive, hot, young stars of the extensive Cygnus OB2 association ionize the region's atomic hydrogen gas, producing the characteristic red glow as protons and electrons recombine. Embedded Cygnus OB2 stars also provide the blue starlight strongly reflected by the dust clouds. The over 1 degree wide telescopic field of view spans about 100 light-years at the estimated distance of NGC 6914.

Imagers notes: I had a really quick bout of clear skies I was not expecting in October 2023. I decided to image this target in about 4 minutes when I noticed it would be clear, so it’s a bit of a random patch of sky in Cygnus near the Sadr region. While imaging this guy, I had the dreaded oil leak issue on my ASI2600MM-Pro. It affected some of the lights and a significant number of flats (that’s how I noticed it) so this took me a while to process. I worked for quite a while to see if I could remediate those areas, but it looks too much like nebulosity and really looked bad when you tried to nicely remove it. I ended up cropping about 10% off the edge.

I also processed this in HaSS, mostly because there’s not a lot of O-III (I did use HSO for the stars) and I saw someone do it and I thought, hmm, that’s cool… so I did it.