M39 (NGC 7092)
Messier M39 (NGC 7092) is a open cluster located in the constellation Cygnus, in the Orion Arm of the Milky Way Galaxy. in the Local Group of galaxies.
Messier M39 is best viewed during early spring, is magnitude 5.5*, and can be viewed with naked eye (just barely). It is 32' in size. For reference, the full moon is 30' (arc minutes) in size.
* The naked eye can see up to magnitude 8 objects under ideal dark sky conditions.
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