NGC 6304

NGC 6304
Credit: 2MASS
Observation data (J2000.0 ^[1] epoch)
Class	VI ^[2]
Constellation	Ophiuchus ^[3]
Right ascension	17^h 14^m 32.25^s ^[1]
Declination	−29° 27′ 43.3″ ^[1]
Distance	19.2 kly ^[2]
Apparent magnitude (V)	9.03 ^[1]
Apparent dimensions (V)	3.8'
Physical characteristics
V_HB	16.25 ^[4]
Metallicity	${\begin{smallmatrix}\left[{\ce {Fe}}/{\ce {H}}\right]\end{smallmatrix}}$ = -0.45 ^[4] dex
Estimated age	~12.3 Gyr^[5]
Other designations	Bennett 90,^[3] C 1711-294,^[1] ESO 454-2,^[1] ESO 454-SC 002,^[6] GC 4275,^[3] GCl 56,^[1] h 3670,^[3] I 147,^[3] NGC 6304,^[1] VDBH 216^[1]

NGC 6304 is a globular cluster in the constellation Ophiuchus. William Herschel discovered this star cluster using an 18.5-inch (47 cm) f/13 speculum reflector telescope in 1786.^[3] It is about 19,000 light-years away, near the Milky Way's central bulge.^[7]

References

1 2 3 4 5 6 7 8 9 "NGC 6304". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-08-18.
1 2 "NGC 6304". SEDS. Retrieved 2012-08-18.
1 2 3 4 5 6 "NGC 6304". Deep Sky Observer's Companion on-line database. Retrieved 2012-08-17.
1 2 "NGC 6304". A Galactic Globular Cluster Database. Version 11.12. Retrieved 2012-08-18.
↑ Forbes, D. A.; Bridges, T. (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.
↑ "NGC 6304". NASA/IPAC Extragalactic Database. Retrieved 2012-08-18.
↑ Crossen, C.; Rhemann, G. (2004), Sky Vistas: Astronomy for Binoculars and Richest-Field Telescopes, Springer-Verlag, p. 254, ISBN 3-211-00851-9

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