Astronomy:NGC 5694
| NGC 5694 | |
|---|---|
| File:250px The core of NGC 5694 imaged by the Hubble Space Telescope | |
| Observation data (J2000 epoch) | |
| Class | VII[1] |
| Constellation | Hydra |
| Right ascension | 14h 39m 36.5s[2] |
| Declination | −26° 32′ 18.0″[2] |
| Distance | 114,100ly[1] |
| Apparent magnitude (V) | 10.2[1] |
| Apparent dimensions (V) | 3.6′[1] |
| Physical characteristics | |
| Metallicity | = –1.74[3] dex |
| Estimated age | 13.44 Gyr[3] |
| Other designations | Caldwell 66 |
NGC 5694 (also known as Caldwell 66) is a globular cluster in the constellation Hydra. It was discovered in 1784 by William Herschel.
Characteristics
This globular cluster is located at a distance of 114,000 light-years (35,000 pc) from the Sun and 96,000 light-years (29,000 pc) from the Galactic Center[4] and is one of the oldest known globular clusters in the Milky Way Galaxy, forming nearly 12 billion years ago.[5]
Its chemical composition is highly peculiar, being highly (to nearly solar levels) enriched in alpha elements, suggesting an extragalactic origin before being captured by the Milky Way.[6]
Noctua
NGC 5694 is located below the tail of the former constellation Noctua, which included faint stars within the modern IAU borders of Libra, Hydra, and Virgo.
See also
References
- ↑ 1.0 1.1 1.2 1.3 "Results for NGC 5694". SEDS NGC Catalog Online. http://spider.seds.org/ngc/ngc.cgi?N5694.
- ↑ 2.0 2.1 "NGC 5694". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+5694.
- ↑ 3.0 3.1 Forbes, Duncan A.; Bridges, Terry (May 2010), "Accreted versus in situ Milky Way globular clusters", Monthly Notices of the Royal Astronomical Society 404 (3): 1203–1214, doi:10.1111/j.1365-2966.2010.16373.x, Bibcode: 2010MNRAS.404.1203F.
- ↑ Harris, W.E. (1996). "A Catalog of Parameters for Globular Clusters in the Milky Way". The Astronomical Journal 112: 1487. doi:10.1086/118116. Bibcode: 1996AJ....112.1487H. http://physwww.physics.mcmaster.ca/%7Eharris/mwgc.dat.
- ↑ "NGC/IC Project". Results for NGC 5694. http://www.ngcicproject.org/ngcicdb.asp.
- ↑ Mucciarelli, A.; Bellazzini, M.; Catelan, M.; Dalessandro, E.; Amigo, P.; Correnti, M.; Cortés, C.; d'Orazi, V. (2013), "NGC 5694: Another foster son of the Galactic halo★", Monthly Notices of the Royal Astronomical Society 435 (4): 3667–3680, doi:10.1093/mnras/stt1558
External links
- NGC 5694 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
Coordinates: 
14h 39m 36.5s, −26° 32′ 18.0″
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