M51 (NGC 5194) - Whirlpool Galaxy
Messier M51 (NGC 5194), also known as the Whirlpool Galaxy, is a spiral galaxy located in the constellation Ursa Major in the M51 Group of galaxies.
Messier M51 is best viewed during early spring, is magnitude 8.0*, and can be viewed with binoculars. It is 11 x 7' 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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