Sharpless 73 (LBN 105, MBM 40 and others) is one of Stewart Sharpless’ mistakes. It is just a molecular cloud, illuminated by the light of the Milky Way. It is considered to be part of the integrated flux nebula.
Luminance – 12x600s – 120 minutes – binned 1x1
RGB – 8x300s – 40 minutes each – binned 2x2
240 minutes total exposure – 4 hours
Imaged on May 7th and June 5th, 2018 at the Danville Conservation Area (New Florence, Missouri) with a SBIG ST-8300M on an Astro-Tech AT90EDT at f/6.7 603mm.
https://www.flickr.com/photos/dcrowson/41908385364/sizes/l