M25 (IC 4725)
Messier 25 (IC 4725) is an open cluster located in the constellation Sagittarius, in the Orion Arm of the Milky Way Galaxy in the Local Group of galaxies. M25 is 2,000 light years away from Earth.
M25 is best viewed during late summer, is magnitude 4.9, and can be viewed with naked eye. M25 is 36' 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.