NGC 6934
Sign in to saveglobular cluster in the constellation Delphinus
Key facts
- Class
- VIII
- Constellation
- Delphinus
- Right ascension
- 20 34 11.37
- Declination
- +07 ° 24 ′ 16.1 ″
- Distance
- 52 kly (16 kpc )
- Apparent dimensions v
- 1.20 ′
- Absolute magnitude
- −7.65
- Mass
- 2.95 × 10 M ☉
- Metallicity
- [ Fe/H ] = –1.47 dex
- Other designations
- Caldwell 47, NGC 6934
via Wikipedia infobox
Wikidata facts
- Instance of
- globular cluster
- Part of
- Milky Way
- Constellation
- Delphinus
- Distance from Earth
- 0.016
- Image
- NGC 6934 Hubble WikiSky.jpg
Show 11 more facts
- catalog code
- [KPS2012] MWSC 3369
- Commons category
- NGC 6934
- discoverer or inventor
- William Herschel
- time of discovery or invention
- 1785-09-24
- apparent magnitude
- 8.572
- right ascension
- 308.547375
- declination
- 7.404472
- epoch
- J2000.0
- radial velocity
- -411.4
- right ascension component of proper motion
- -2.93
- declination component of proper motion
- -4.20
Sources (1)
via Wikidata · CC0
~1 min read
Encyclopedic overview
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. It was discovered by the German-born astronomer William Herschel on 24 September 1785. 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. As of 2018, it has been poorly studied.
This appears to be a Oosterhoff type I cluster with an intermediate metallicity. It has an Shapley–Sawyer Concentration Class of VIII, with a core radius of 15″ and a half-light radius of 36″. The estimated mass is 295,000 times the mass of the Sun. The cluster displays photometric anomalies, with a split subgiant branch on the HR diagram. 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. There is some evidence for a tidal tail.
Excerpted from Wikipedia’s “NGC 6934” article, available under the CC BY-SA 4.0 licence.