M51

M51 - Whirlpool Galaxy

Messier 51 or M51 (also designated NGC 5194/5) is a spiral galaxy in the constellation Canes Venatici. It has an apparent visual magnitude of 8.4 and its angular diameter is 11x7 arc-minutes. M51 lies at an estimated distance of 37 million light years. The Epoch 2000 coordinates are RA= 13h 30m, Dec= +47° 11' which makes M51 best seen during the spring. The Messier Spring Star Chart shows the position of all Messier objects visible during that season. As one of the more famous objects in the Messier Catalog, it is commonly known as the Whirlpool Galaxy. For more information, see the Messier Catalog as well as specific entries for M51 in Wikipedia and SEDS.

The image above shows the uncropped view of M51 through the Takahashi E-180 Astrograph (North is up). To the right is a 3x enlargement of the this image.

For a higher power view of this object using the ASA N12 Corrected Newtonian Astrograph, see M51 (ASA N12).

Messier's Description of M51

January 11, 1774
`Very faint nebula, without stars, near the eye of the Northern Greyhound [hunting dog], below the star Eta of 2nd magnitude of the tail of Ursa Major: M. Messier discovered this nebula on October 13, 1773, while he was watching the comet visible at that time. One cannot see this nebula without difficulties with an simple refractor of 3.5 feet: Near it is a star of 8th magnitude. M. Messier reported its position on the Chart of the Comet observed in 1773 and 1774. Memoirs of the Academy 1774, plate III. It is double, each has a bright center, which are separated 4'35". The two "atmospheres" touch each other, the one is even fainter than the other. Reobserved several times.'

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