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Messier M21

M21 (NGC 6531) is a Open Cluster located in the constellation Sagittarius, is best viewed during Late Summer, and is magnitude 7. The naked eye can see magnitude 6 objects (magnitude 8 under ideal dark sky conditions). It is 13' in size. For reference, the full moon is 30' (arc minutes) in size, or 1/2°.

      1. Name:
      2. N/A
      1. Type:
      2. Open Cluster
      1. NGC:
      2. 6531
      1. Magnitude:
      2. 7
      1. Size:
      2. 13'
      1. RA:
      2. 18h 4.6m
      1. Dec:
      2. -22 30'
      1. Season:
      2. Late Summer

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