NGC 5694 (also known as Caldwell 66) is a globular cluster in the constellation Hydra. It was discovered in 1784 by William Herschel.
NGC 5694 | |
---|---|
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 |
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]
See also
References
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
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