NGC 5822
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NGC 5822 is an open cluster of stars in the southern constellation of Lupus.[1] It was discovered by English Astronomer John Herschel on July 3, 1836,[2] and lies close to another cluster, NGC 5823, which suggests there may be a physical association.[3][4]
NGC 5822 is an intermediate age cluster, estimated at around 900 million years old, and it is located nearby[5] at a distance of 2,700 light years.[6] The Trumpler class of this cluster is III 2m.[4] It is richly populated[7] with half the cluster members lying within an angular radius of Script error: No such module "val"..[6] The cluster is considered low mass at ~1,700 times the mass of the Sun.[5] It has a core radius of Script error: No such module "val". and a limiting radius of Script error: No such module "val"..[8]
Measuring the abundances of a set of F-type stars that are probable members demonstrates the cluster metallicity is very similar to the Sun.[7] It displays an extended main sequence turnoff on the Hertzsprung–Russell diagram, most likely due to differences in stellar rotation.[5] Two barium stars have been identified in NGC 5822, making it only the second cluster shown to host these objects as of 2013.[9]
Gallery
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Map showing the location of NGC 5822
References
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