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C³ Centauri
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Centaurus
Right ascension	11h 37m 33.98833s
Declination	−47° 44′ 50.2343″
Apparent magnitude (V)	+5.46
Characteristics
Spectral type	K2 III
B−V color index	+1.23±0.01
Astrometry
Radial velocity (Rv)	−0.18±0.40 km/s
Proper motion (μ)	RA: -68.956 mas/yr ; Dec.: 16.362 mas/yr
Parallax (π)	9.5467 ± 0.1227 mas
Distance	342 ± 4 ly ; (105 ± 1 pc)
Details
Mass	2.16 M☉
Radius	15.85+0.30; −0.44 R☉
Luminosity	95.8±1.5 L☉
Surface gravity (log g)	2.12 cgs
Temperature	4,535+174; −43 K
Metallicity [Fe/H]	0.10 dex
Rotational velocity (v sin i)	>1.0 km/s
Other designations
	C3 Cen, CD−47°6997, HD 101067, HIP 56700, HR 4476, SAO 222917
Database references
SIMBAD	data

C³ Centauri is a suspected astrometric binary^[8] star system in the southern constellation of Centaurus. It has an orange hue and is dimly visible to the naked eye with an apparent visual magnitude of +5.46.^[2] The distance to this object is approximately 342 light years based on parallax.^[1] It is a member of the Hyades Stream of co-moving stars.^[9]

The visible component of this system is an aging giant star with a stellar classification of K2 III,^[3] which indicates it has exhausted the supply of hydrogen at its core then cooled and expanded off the main sequence. At present it has nearly sixteen^[1] times the girth of the Sun. It is radiating 96^[1] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,535 K.^[1]

References

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
^ ^a ^b ^c Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
^ ^a ^b Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
^ ^a ^b Charbonnel, C.; Lagarde, N.; Jasniewicz, G.; North, P. L.; Shetrone, M.; Krugler Hollek, J.; Smith, V. V.; Smiljanic, R.; Palacios, A.; Ottoni, G. (2020), "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era", Astronomy and Astrophysics, 633: A34, arXiv:1910.12732, Bibcode:2020A&A...633A..34C, doi:10.1051/0004-6361/201936360, S2CID 204907220.
^ Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A.; Matijevič, G.; Monari, G.; Cantat-Gaudin, T.; Weiler, M.; Khan, S.; Miglio, A.; Carrillo, I.; Romero-Gómez, M.; Minchev, I.; De Jong, R. S.; Antoja, T.; Ramos, P.; Steinmetz, M.; Enke, H. (2019), "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18", Astronomy and Astrophysics, 628: A94, arXiv:1904.11302, Bibcode:2019A&A...628A..94A, doi:10.1051/0004-6361/201935765, S2CID 131780028.
^ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014), "A catalog of rotational and radial velocities for evolved stars. V. Southern stars", Astronomy and Astrophysics, 561: A126, arXiv:1312.3474, Bibcode:2014A&A...561A.126D, doi:10.1051/0004-6361/201220762, S2CID 54046583.
^ "HD 101067". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-03-02.
^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
^ Eggen, O. J. (February 1985), "A systematic search for members of the Hyades supercluster. V. The red giants.", Astronomical Journal, 90: 333–340, Bibcode:1985AJ.....90..333E, doi:10.1086/113736.