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Messier M7 - Ptolemy's Cluster

M7 (NGC 6475), also known as the Ptolemy's Cluster, is a Open Cluster located in the constellation Scorpius, is best viewed during Mid-Summer, and is magnitude 3.3. The naked eye can see magnitude 6 objects (magnitude 8 under ideal dark sky conditions). It is 80' in size. For reference, the full moon is 30' (arc minutes) in size, or 1/2°.

      1. Name:
      2. Ptolemy's Cluster
      1. Type:
      2. Open Cluster
      1. NGC:
      2. 6475
      1. Magnitude:
      2. 3.3
      1. Size:
      2. 80'
      1. RA:
      2. 17h 53.9m
      1. Dec:
      2. -34 49'
      1. Season:
      2. Mid-Summer

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