Whirlpool Galaxy

M51 and NGC 5195
M51 and NGC 5195 by Hubble Space Telescope
TypeGalaxy
ConstellationCanes Venatici
Right Ascension13h 29m 52.70s
Declination47° 11' 43.00"
Apparent Magnitude8.4
Apparent Size11.2' x 6.9'

The Whirlpool Galaxy, also known as Messier 51a, M51a, and NGC 5194, is an interacting grand-design spiral galaxy with a Seyfert 2 active galactic nucleus. It lies in the constellation Canes Venatici, and was the first galaxy to be classified as a spiral galaxy. Its distance is 31 million light-years away from Earth.

The galaxy and its companion, NGC 5195, are easily observed by amateur astronomers, and the two galaxies may be seen with binoculars. The Whirlpool Galaxy has been extensively observed by professional astronomers, who study it to understand galaxy structure (particularly structure associated with the spiral arms) and galaxy interactions.

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