NGC 381
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NGC 381 is an open cluster of stars in the northern constellation of Cassiopeia, located at a distance of approximately Script error: No such module "convert". from the Sun.[1] Credit for the discovery of this cluster was given to Caroline Herschel by her brother William in 1787, although she may never have actually seen it.[2]
This is a Trumpler class III 1 m cluster of intermediate age,[3] estimated at 316 million years. This class indicates the cluster is relatively weakly concentrated, with a small brightness range and an intermediate richness of stars. A total of 350 probable members have been identified, down to 20th magnitude,[1] and the cluster contains about 32 times the mass of the Sun.[4] The cluster has a core angular radius of Script error: No such module "val". and an outer cluster radius of Script error: No such module "val"..[1] It has a physical tidal radius of Script error: No such module "convert"..[5] No giant stars have been discovered in this cluster.[3] Four candidate variable stars have been found in the field of NGC 381; one of which is a suspected cluster member.[6] The eclipsing binary OX Cassiopeiae was once thought to be a member, but is now known to be a background star system.[7]
References
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External links
- Template:WikiSky
- SEDS – NGC 381
Template:Sky Template:Ngc5 Template:Cassiopeia (constellation)