| NGC 6250 | |
|---|---|
 | |
| Observation data (J2000 epoch) | |
| Right ascension | 16h57m 58.(0)s[1] |
| Declination | −45° 56′ 3(6)″[1] |
| Distance | 2,820 ly (865 pc)[1] |
| Apparent magnitude (V) | 5.9[2] |
| Apparent dimensions (V) | 18′[2] |
| Physical characteristics | |
| Estimated age | 14 Ma[3] |
| Other designations | NGC 6250, Cr 320, C 1654-457, ESO 277-SC20, OCL 991, VDBH 206.[4] |
| Associations | |
| Constellation | Ara |
| See also: Open cluster, List of open clusters | |
NGC 6250 is a open cluster of stars in the southern constellationofAra, near the border with Scorpius.[5] It was discovered by English astronomer John Herschel on July 1, 1834.[6] This cluster has an apparent visual magnitude of 5.9 and spans an angular diameterof18′,[2] with the brightest member being of magnitude 7.6. About 15 members are visible with binoculars or a small telescope.[7] NGC 6250 is located at a distance of 2,820 ly (865 pc) from the Sun,[1] and is approaching with a mean radial velocityof−10±6 km/s.[8]
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).[9] This is a young cluster with an estimated age of 14 million years.[3] Seven cluster members are B-type stars,[10] and three are illuminating reflection nebulae.[11] Two magnetic chemically peculiar stars (CP2) and two candidate Lambda Boötis stars have been identified as members.[9] The metallicity of the cluster members is consistent with the Sun.[8]
Media related to NGC 6250 at Wikimedia Commons|
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