- NGC 6522
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NGC 6522 Observation data (J2000 epoch) Constellation Sagittarius Right ascension 18h 3m 34.1s[1] Declination -30° 2′ 2.3″[1] Distance 20 000 (6 000) Physical characteristics Estimated age >12 Gyr See also: Globular cluster, List of globular clusters NGC 6522 is a globular cluster in the constellation Sagittarius. It was discovered by William Herschel on June 24, 1784. It is centered in a region of the sky known as Baade's Window[1].
NGC 6522 is possibly the oldest star cluster in the Milky Way[2], with an age of more than 12 Gigayears.[3]
References
- ^ a b c "SIMBAD Astronomical Database". Results for NGC 6522. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NGC+6522. Retrieved 2011-03-13.
- ^ "VLT-FLAMES Analysis of 8 giants in the Bulge Metal-poor Globular Cluster NGC 6522: Oldest Cluster in the Galaxy?" by B. Barbuy et al., 2009
- ^ "The universe's first stars were whirling dervishes", New Scientist by David Shiga, 30 April, 2011, p. 20. "Imprints of fast-rotating massive stars in the Galactic Bulge" by Cristina Chiappini et al., Nature 472, pp. 454–457 (28 April 2011).
External links
Categories:- Globular clusters
- Sagittarius constellation
- NGC objects
- Star cluster stubs
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