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