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Messier 103
Messier 103
Credit: NASA, ESA

M103 (NGC 581)

Messier 103 (NGC 581) is an open cluster located in the constellation Cassiopeia, in the Perseus Arm of the Milky Way Galaxy in the Local Group of galaxies. M103 is 10,000 light years away from Earth.

M103 is best viewed during winter, is magnitude 7.4, and can be viewed with binoculars. M103 is 6' 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 581
      1. Magnitude:
      2. 7.4
      1. Viewing:
      2. binoculars
      1. Size:
      2. 6'
      1. Distance (light years):
      2. 10,000 LY
      1. RA:
      2. 1h 33.2m
      1. Dec:
      2. 60 42'
      1. Season:
      2. winter
      1. Milky Way location:
      2. Perseus Arm
      1. Galaxy group:
      2. Local Group

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