NGC 6934
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NGC 6934 (also known as Caldwell 47) is a globular cluster of stars in the northern constellation of Delphinus, about Script error: No such module "convert". distant from the Sun.[1] It was discovered by the German-born astronomer William Herschel on 24 September 1785.[2] The cluster is following a highly eccentric orbit (with an eccentricity of 0.81) through the Milky Way along an orbital plane that is inclined by 73° to the galactic plane. It may share a common dynamic origin with NGC 5466.[3] As of 2018, it has been poorly studied.[4]
This appears to be a Oosterhoff type I cluster with an intermediate metallicity.[5] It has an Shapley–Sawyer Concentration Class of VIII,[6] with a core radius of Script error: No such module "val".[1] and a half-light radius of Script error: No such module "val"..[7] The estimated mass is 295,000 times the mass of the Sun.[8] The cluster displays photometric anomalies, with a split subgiant branch on the HR diagram.[4] Searches for variable stars have discovered 85 in the cluster field, of which 79 are of the RR Lyrae class and one is a SX Phe variable.[5] There is some evidence for a tidal tail.[9]
References
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External links
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- A Distant Backwater of the Milky Way — ESA/Hubble Picture of the Week
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