Sh 2-73 is located in the constellation Hercules and was mistakenly included in the Sharpless catalog as an emission nebula. We now know that the nebula is simply a molecular cloud. With its relatively high galactic latitude, about 45°, the integrated light of the galaxy illuminates the nebula. Therefore, we can refer to Sh 2-73 as an integrated flux nebula, as defined by Steve Mandel.
Taken: 4/30/2014 to 6/20/2014 Chino Valley, AZ
Takahashi FSQ-106ED Scope
SBIG STF-8300M camera
Baader LRGB filters
Losmandy G11 mount
Total exposure = 27.75 hrs.
For more info see URL...
http://bf-astro.com/sh2-73/sh2-73.htm