Sh2-73 Nebula

Bob Franke
Location of photo
Chino Valley, AZ
Date/Time of photo
4/30/2014 to 6/20/2014
Takahashi FSQ-106ED scope, Losmandy G11 mount, SBIG STF-8300M camera, Baader LRGB filters. Total exposure = 27.75 hrs.
Sh2-73 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 Sh2-73 as an integrated flux nebula, as defined by Steve Mandel.
All comments must follow the Sky & Telescope Terms of Use and will be moderated prior to posting. Please be civil in your comments. Sky & Telescope reserves the right to use the comments we receive, in whole or in part, and to use the commenter’s username, in any medium. See also the Terms of Use and Privacy Policy.


This site uses Akismet to reduce spam. Learn how your comment data is processed.