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Encyclopedia > Open Cluster M6

The Butterfly Cluster (also known as Open Cluster M6, Messier Object 6, Messier 6, M6, or NGC 6405) is an open cluster in the Scorpius constellation. It was discovered by Giovanni Batista Hodierna before 1654.


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Messier Object 6 (515 words)
Open cluster Messier 6 is described by Burnham as a "charming group whose arrangement suggests the outline of a butterfly with open wings."
Thus, Philippe Loys de Chéseaux independently rediscovered it in 1745-46, and was the first to recognize it as "a very fine star cluster." Abbe Lacaille included it in his catalog of 1751-52 as Lac III.12, and Charles Messier eventually cataloged it on May 23, 1764.
Of all Messier objects, M6 is situated at the closest angular distance from the Galactic Center, which is located in the constellation Sagittarius but very near to the 3-constellation edge of Sagittarius, Scorpius and Ophiuchus.
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