Back 47 الطوقان Arabic 47 Tucanae AST NGC 104 Azerbaijani NGC 104 Byelorussian 47 Tucanae BS 47 del Tucà Catalan NGC 104 CE 47 Tucanae Czech 47 Tucanae German NGC 104 DIQ
| 47 Tucanae | |
|---|---|
 After Omega Centauri, 47 Tucanae is the brightest globular cluster in the night sky.[1] | |
| Observation data (J2000 epoch) | |
| Class | III[2] |
| Constellation | Tucana |
| Right ascension | 00h 24m 05.67s[3] |
| Declination | −72° 04′ 52.6″[3] |
| Distance | 4.45 ± 0.01 kpc (14,500 ± 32.6 ly)[4][5] |
| Apparent magnitude (V) | +4.09[3] |
| Apparent dimensions (V) | 43.8′ |
| Physical characteristics | |
| Mass | 7.00×105[6] M☉ |
| Radius | 60 ly[7] |
| VHB | 14.2 |
| Metallicity | = −0.78[8] dex |
| Estimated age | 13.06 Gyr[8] |
| Notable features | 2nd brightest globular cluster after Omega Centauri |
| Other designations | ξ Tuc, NGC 104, Caldwell 106, Mel 1,[3] GCl 1, 1RXS J002404.6-720456 |
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47 Tucanae or 47 Tuc (also designated as NGC 104 and Caldwell 106) is a globular cluster located in the constellation Tucana. It is about 4.45 ± 0.01 kpc (15,000 ± 33 ly) from Earth,[9][4] and 120 light years in diameter.[10] 47 Tuc can be seen with the naked eye, with an apparent magnitude of 4.1.[3] It appears about 44 arcminutes across including its far outreaches. Due to its far southern location, 18° from the south celestial pole, it was not catalogued by European astronomers until the 1750s, when the cluster was first identified by Nicolas-Louis de Lacaille from South Africa.
47 Tucanae is the second brightest globular cluster after Omega Centauri, and telescopically reveals about ten thousand stars, many appearing within a small dense central core. The cluster may contain an intermediate-mass black hole.[11][12]
- ^ "Retirement in the suburbs". Retrieved 12 June 2015.
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- ^ a b Cite error: The named reference
mnras404_3_1203was invoked but never defined (see the help page). - ^ McLaughlin, D.E.; et al. (2006). "Hubble Space Telescope Proper Motions and Stellar Dynamics in the Core of the Globular Cluster 47 Tucanae". Astrophysical Journal Supplement Series. 166 (1): 249–297. arXiv:astro-ph/0607597. Bibcode:2006ApJS..166..249M. doi:10.1086/505692. S2CID 116985213.
- ^ "47 Tuc: A Great Globular Cluster of Stars". Astronomy Picture of the Day. August 26, 2008. Retrieved 25 May 2017.
- ^ Kızıltan, Bülent; Baumgardt, Holger; Loeb, Abraham (2017). "An intermediate-mass black hole in the centre of the globular cluster 47 Tucanae". Nature. 542 (7640): 203–205. arXiv:1702.02149. Bibcode:2017Natur.542..203K. doi:10.1038/nature21361. PMID 28179649. S2CID 1289123.
- ^ Freire, Paulo; Ridolfi, Alessandro; Kramer, Michael (2017). "Long-term observations of the pulsars in 47 Tucanae - II. Proper motions, accelerations and jerks". Monthly Notices of the Royal Astronomical Society. 471 (7640): 857–876. arXiv:1706.04908. Bibcode:2017MNRAS.471..857F. doi:10.1093/mnras/stx1533.