NGC 6250
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NGC 6250 is a open cluster of stars in the southern constellation of Ara, near the border with Scorpius.[1] It was discovered by English astronomer John Herschel on July 1, 1834.[2] This cluster has an apparent visual magnitude of 5.9 and spans an angular diameter of Script error: No such module "val".,[3] with the brightest member being of magnitude 7.6. About 15 members are visible with binoculars or a small telescope.[4] NGC 6250 is located at a distance of Script error: No such module "convert". from the Sun,[5] and is approaching with a mean radial velocity of Script error: No such module "val"..[6]
The Trumpler classification of NGC 6250 is II 3 r, indicating a rich cluster of stars (r) with a slightly disparate grouping (II) and a large brightness range (3).[7] This is a young cluster with an estimated age of 14 million years.[8] Seven cluster members are B-type stars,[9] and three are illuminating reflection nebulae.[10] Two magnetic chemically peculiar stars (CP2) and two candidate Lambda Boötis stars have been identified as members.[7] The metallicity of the cluster members is consistent with the Sun.[6]
References
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