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Messier 23
Messier 23
Credit: NASA, ESA

M23 (NGC 6494)

Messier 23 (NGC 6494) is an open cluster located in the constellation Sagittarius, in the Orion Arm of the Milky Way Galaxy in the Local Group of galaxies. M23 is 21,000 light years away from Earth.

M23 is best viewed during late summer, is magnitude 5.5, and can be viewed with naked eye (barely). M23 is 35' in apparent size. For reference, the full moon is 30' (arc minutes) in size.

      1. Name:
      1. Type:
      2. open cluster
      1. NGC or IC:
      2. NGC 6494
      1. Magnitude:
      2. 5.5
      1. Viewing:
      2. naked eye (barely)
      1. Size:
      2. 35'
      1. Distance (light years):
      2. 21,000 LY
      1. RA:
      2. 17h 56.8m
      1. Dec:
      2. -19 1'
      1. Season:
      2. late 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.