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| NGC 6304 | |
|---|---|
 | |
| Observation data (J2000.0[1] epoch) | |
| Class | VI [2] |
| Constellation | Ophiuchus[3] |
| Right ascension | 17h 14m 32.25s [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 | |
| VHB | 16.25 [4] |
| Metallicity | = -0.45 [4] dex |
| Estimated age | ~12.3 Gyr[5] |
| Other designations | Bennett 90,[3] C 1711-294,[1] |
![{\displaystyle {\begin{smallmatrix}\left[{\ce {Fe}}/{\ce {H}}\right]\end{smallmatrix}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/4c0821bd80891e071c08e7c7ee8e022baedf522c)
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]
- ^ a b c d e f g h i "NGC 6304". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-08-18.
- ^ a b "NGC 6304". SEDS. Retrieved 2012-08-18.
- ^ a b c d e f "NGC 6304". Deep Sky Observer's Companion on-line database. Retrieved 2012-08-17.
- ^ a b "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. S2CID 51825384.
- ^ "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 978-3-211-00851-5