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Star Cluster

Ptolemy Cluster:
open star cluster

Ptolemy Cluster is a open star cluster located in the constellation Scorpius . Ptolemy Cluster is magnitude 3.30*, and is 1° ' 20' in size. For reference, the full moon is 30' (arc minutes) or 0.5° in size.

      1. Name:
      2. Ptolemy Cluster
      1. Type:
      2. open cluster
      1. Magnitude (m):
      2. 3.30
      1. Size:
      2. 1° ' 20'
      1. Right Ascension:
      2. 17h 53.8m
      1. Declination:
      2. -34° 47'
      1. Messier #:
      2. M7

    * One can see up to magnitude 7-8 objects with perfect eyes under ideal dark sky conditions.



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