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Messier 7
Messier 7 Ptolemy Cluster
Credit: NASA, ESA

M7 (NGC 6475) - Ptolemy Cluster

Messier 7 (NGC 6475), also known as the Ptolemy Cluster, is an open cluster located in the constellation Scorpius, in the Orion Arm of the Milky Way Galaxy in the Local Group of galaxies. M7 is 980 light years away from Earth.

M7 is best viewed during mid-summer, is magnitude 3.3, and can be viewed with naked eye. M7 is 80' in apparent size. For reference, the full moon is 30' (arc minutes) in size.

      1. Name:
      2. Ptolemy Cluster
      1. Type:
      2. open cluster
      1. NGC or IC:
      2. NGC 6475
      1. Magnitude:
      2. 3.3
      1. Viewing:
      2. naked eye
      1. Size:
      2. 80'
      1. Distance (light years):
      2. 980 LY
      1. RA:
      2. 17h 53.9m
      1. Dec:
      2. -34 49'
      1. Season:
      2. mid-summer
      1. Milky Way location:
      2. Orion Arm
      1. Galaxy group:
      2. Local Group

    * The naked eye can see up to magnitude 8 objects under ideal dark sky conditions.