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Messier 37, open cluster in Auriga - 10 minute exposure earlier this evening. Starlight from 4500 years ago.

Messier 37 is the richest open cluster in the constellation Auriga. It is the brightest of three open clusters in Auriga and was discovered by the Italian astronomer Giovanni Battista Hodierna before 1654. M37 was missed by French astronomer Guillaume Le Gentil when he rediscovered M36 and M38 in 1749. French astronomer Charles Messier independently rediscovered M37 in September of 1764 but all three clusters were recorded by Hodierna. It is classified as Trumpler type I,1,r or I,2,r.

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