NGC 6934 information

NGC 6934
NGC 6934
	NGC 6934 by Hubble Space Telescope; 3.5′ view
Observation data (J2000 epoch)
Class	VIII
Constellation	Delphinus
Right ascension	20h 34m 11.37s
Declination	+07° 24′ 16.1″
Distance	52 kly (16 kpc)
Apparent magnitude (V)	8.83
Apparent dimensions (V)	1.20′
Physical characteristics
Absolute magnitude	−7.65
Mass	2.95×105 M☉
Metallicity	= –1.47 dex
Other designations	Caldwell 47, NGC 6934
	See also: Globular cluster, List of globular clusters

NGC 6934 (also known as Caldwell 47) is a globular cluster of stars in the northern constellation of Delphinus, about 52 kilolight-years distant from the Sun.^[3] It was discovered by the German-born astronomer William Herschel on 24 September 1785.^[4] 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.^[6] As of 2018, it has been poorly studied.^[9]

This appears to be a Oosterhoff type I cluster with an intermediate metallicity.^[10] It has an Shapley–Sawyer Concentration Class of VIII,^[1] with a core radius of 15″^[3] and a half-light radius of 36″.^[5] The estimated mass is 295,000 times the mass of the Sun.^[7] The cluster displays photometric anomalies, with a split subgiant branch on the HR diagram.^[9] 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.^[10] There is some evidence for a tidal tail.^[11]

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NGC 6934 information

and 17 Related for: NGC 6934 information

NGC 6934

Delphinus

Caldwell catalogue

Melotte catalogue

List of globular clusters

Herschel 400 Catalogue

Epsilon Delphini

Sufi Observing Competition

Delta Delphini

NGC 6818

Telescopium

Eta Delphini

NGC 6509

NGC 6782

Stellar population

42 Orionis

HD 150136