M46 (NGC 2437)
Messier 46 (NGC 2437) is an open cluster located in the constellation Puppis, in the Orion Arm of the Milky Way Galaxy in the Local Group of galaxies. M46 is 2,870 light years away from Earth.
M46 is best viewed during winter, is magnitude 5.9, and can be viewed with naked eye (barely). M46 is 16' in apparent 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.