M31 (NGC 224) - Andromeda Galaxy
Messier 31 (NGC 224), also known as the Andromeda Galaxy, is a spiral galaxy located in the constellation Andromeda in the Local Group of galaxies. M31 is 2,500,000 light years away from Earth.
M31 is best viewed during winter, is magnitude 3.4, and can be viewed with naked eye. M31 is 3° x 1° 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.