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NGC 5694
The core of NGC 5694 imaged by the Hubble Space Telescope
Observation data (J2000 epoch)
Class	VII
Constellation	Hydra
Right ascension	14 39 36.5
Declination	−26° 32′ 18.0″
Distance	114,100ly
Apparent magnitude (V)	10.2
Apparent dimensions (V)	3.6′
Physical characteristics
Metallicity	${\displaystyle {\begin{smallmatrix}\left\end{smallmatrix}}}$ = –1.74 dex
Estimated age	13.44 Gyr
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 and is one of the oldest known globular clusters in the Milky Way Galaxy, forming nearly 12 billion years ago.

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.

Noctua

The location of NGC 5694 is immediately west of the former constellation Noctua, which includes the stars 54, 55, 56 and 57 Hydrae.

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

• Globular clusters
• Hydra (constellation)
• NGC objects
• Caldwell objects
• Astronomical objects discovered in 1783