Optics/mount : 12″ACF 2.7m AP-Reduzer Alt-5
Camera/filters: Atik 11002 AstrodonL,R,G,B
Exposure:50×300 L and 15×30 RGB all 2bin
Date 01/02 June 2019

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 estimated to be 23 milion 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.@wiki

M51, aussi connue comme la galaxie du Tourbillon (Whirlpool Galaxy en anglais) est un couple de galaxies, à environ 27,4 millions d’a.l de la Terre dans la constellation des Chiens de chasse, composé d’une galaxie spirale régulière massive dont le diamètre est estimé à 100 000 années-lumière et d’une petite galaxie irrégulière. Elle a été découverte en 1773 par Charles Messier.

Ses bras spiraux facilement visibles lui ont valu son surnom de « galaxie tourbillon » (Whirlpool Galaxy en anglais), qui a donné son nom à la fonction de hachage Whirlpool.@wiki

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