M7 - The Ptolemy Cluster

  
 
 
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M7 - Ptolemy Cluster
 
 
  • RA: 17:54
  • Dec: -34:49
  • Size: 80 arcmin
  • Magnitude: 3.3
  • Distance: 800 ly
  • Constellation:  Scorpius
  • Scope: Orion ED80
  • Autoguider:  ST-4 in faint mode
  • Sky conditions:  average seeing and transparency.
  • Camera: Hap Griffin modified Canon XSi @ ISO 800
  • Exposure:  15 x 2 minutes
  • Date:  August 15, 2010
  
 
Comments:  M7, also designated NGC 6475 and sometimes known as the Ptolemy Cluster, is an open cluster of stars in the constellation of Scorpius. At the cluster's estimated distance of 800–1000 light years this corresponds to an actual diameter of 18–25 light years. The age of the cluster is around 220 million years while the brightest star is of magnitude 5.6.