NGC 5694

NGC 5694
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	${\displaystyle {\begin{smallmatrix}\left[{\ce {Fe}}/{\ce {H}}\right]\end{smallmatrix}}}$ = –1.74 [3] dex
Estimated age	13.44  Gyr [3]
Other designations	Caldwell  66
See also: Globular cluster, List of globular clusters

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

• NGC 4372

References

1. "Results for NGC 5694". SEDS NGC Catalog Online. Retrieved 2010-12-07.
2. "NGC 5694". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2010-12-07.
3. 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, arXiv: 1001.4289 , Bibcode:2010MNRAS.404.1203F, doi: 10.1111/j.1365-2966.2010.16373.x , S2CID   51825384.
4. Harris, W.E. (1996). "A Catalog of Parameters for Globular Clusters in the Milky Way" . The Astronomical Journal. 112: 1487. Bibcode:1996AJ....112.1487H. doi:10.1086/118116.
5. "NGC/IC Project". Results for NGC 5694. Archived from the original on 2012-05-20. Retrieved 2010-12-07.
6. 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, arXiv: 1308.6653 , doi: 10.1093/mnras/stt1558

External links

• Media related to NGC 5694 at Wikimedia Commons
• NGC 5694 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images