NGC 6934 | |
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![]() NGC 6934 by
Hubble Space Telescope; 3.5′ view | |
Observation data ( J2000 epoch) | |
Class | VIII [1] |
Constellation | Delphinus |
Right ascension | 20h 34m 11.37s [2] |
Declination | +07° 24′ 16.1″ [2] |
Distance | 52 kly (16 kpc) [3] |
Apparent magnitude (V) | 8.83 [4] |
Apparent dimensions (V) | 1.20 ′ [5] |
Physical characteristics | |
Absolute magnitude | −7.65 [6] |
Mass | 2.95×105 [7] M☉ |
Metallicity | = –1.47 [7] dex |
Other designations | Caldwell 47, NGC 6934 [8] |
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]
NGC 6934 | |
---|---|
![]() NGC 6934 by
Hubble Space Telescope; 3.5′ view | |
Observation data ( J2000 epoch) | |
Class | VIII [1] |
Constellation | Delphinus |
Right ascension | 20h 34m 11.37s [2] |
Declination | +07° 24′ 16.1″ [2] |
Distance | 52 kly (16 kpc) [3] |
Apparent magnitude (V) | 8.83 [4] |
Apparent dimensions (V) | 1.20 ′ [5] |
Physical characteristics | |
Absolute magnitude | −7.65 [6] |
Mass | 2.95×105 [7] M☉ |
Metallicity | = –1.47 [7] dex |
Other designations | Caldwell 47, NGC 6934 [8] |
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]