Monday, November 19, 2018   
 
Astrophotography Gallery > Star Clusters > Ptolemy Cluster (M7)
Date: Monday, July 8, 2013
Location: Golden State Star Party, CA
 
The Ptolemy Cluster, catalogued as M7 and NGC6475, is an open cluster in the constellation Scorpius. It has approximately 80 members stars and lies at a distance of 980 light years from Earth. It is unique in that it has been known for a very long time; Ptolemy documented it in the year 130 AD.
 
Mount: Celestron CGEM (Hypertuned)
Camera: Canon 60D (Stock)
Scope/Lens: Orion Astrograph 8" f/3.9 Newtonian
Guide Scope: Orion ST 80mm f/5 Refractor
Guide Camera: Orion Starshoot Autoguider
 
Exposure #1 (RGB):
   36 x 45 @ ISO 1600, f/3.9
   15 Darks, 50 Flats/Dark Flats/Bias

 
Integration: 0 Hours, 27 Minutes, 0 Seconds
 
Processing: BackyardEOS, PHD, DeepSkyStacker, Adobe Photoshop CS6
(Click Image to View Original Full Size)
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