HD 129685

c² Centauri
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Centaurus
Right ascension	14h 44m 59.20177s[1]
Declination	−35° 11′ 30.5750″[1]
Apparent magnitude (V)	+4.92[2]
Characteristics
Spectral type	A0IVnn[3] or A0Vn[4]
B−V color index	+0.013±0.006[2]
Astrometry
Radial velocity (Rv)	−5.0±2.8[2] km/s
Proper motion (μ)	RA: 9.255[1] mas/yr ; Dec.: −3.943[1] mas/yr
Parallax (π)	14.1199 ± 0.2091 mas[1]
Distance	231 ± 3 ly ; (71 ± 1 pc)
Absolute magnitude (MV)	0.83[2]
Details
Mass	2.10+0.12; −0.09[5] M☉
Luminosity	44.73[2] L☉
Surface gravity (log g)	3.80±0.14[5] cgs
Temperature	9,323[6] K
Age	239+143; −144[5] Myr
Other designations
	c2 Cen, CD−34°9888, GC 19845, HD 129685, HIP 72104, HR 5489, SAO 205899[7]
Database references
SIMBAD	data

HD 129685 is a single[8] star in the southern constellation of Centaurus. It is also known by its Bayer designation c² Centauri, while HD 129685 is the star's identifier in the Henry Draper catalogue. This object has a white hue and is faintly visible to the naked eye with an apparent visual magnitude of +4.92.[2] It is located at a distance of approximately 231 light years from the Sun based on parallax, and it has an absolute magnitude of 0.83.[2] The star is drifting closer with a radial velocity of around −5 km/s.[2]

Two different stellar classifications have been reported for this star. A class of A0Vn[4] assigned by Abt and Morrell (1995) indicates it is a rapidly-rotating A-type main-sequence star, while a type of A0IVnn,[3] according to Gray and Garrison (1987), suggests it is a somewhat more evolved subgiant star. It is around 239 million years old with 2.1 times the mass of the Sun,[5] and is reported to be rotating close to its break-up velocity.[9] The star is radiating 45[2] times the luminosity of the Sun from its photosphere at an effective temperature of 9,323 K.[6]

References

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.
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.
Gray, R. O.; Garrison, R. F. (December 1987), "The Early A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation", Astrophysical Journal Supplement, 65: 581, Bibcode:1987ApJS...65..581G, doi:10.1086/191237.
Abt, Helmut A.; Morrell, Nidia I. (July 1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars", Astrophysical Journal Supplement, 99: 135, Bibcode:1995ApJS...99..135A, doi:10.1086/192182.
Gullikson, Kevin; Kraus, Adam; Dodson-Robinson, Sarah (2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", The Astronomical Journal, 152 (2): 40, arXiv:1604.06456, Bibcode:2016AJ....152...40G, doi:10.3847/0004-6256/152/2/40, S2CID 119179065.
di Benedetto, G. P. (November 1998), "Towards a fundamental calibration of stellar parameters of A, F, G, K dwarfs and giants", Astronomy and Astrophysics, 339: 858–871, Bibcode:1998A&A...339..858D.
"c02 Cen". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-03-03.
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.
Molaro, P.; Morossi, C.; Ramella, M.; Franco, M. (July 1984), "IUE spectra of three A0 V stars rotating close to their break-up velocity: HD 119921, HD 129685, HD 181296", ESA Fourth European IUE Conf, 218: 223–225, Bibcode:1984ESASP.218..223M.

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[GaiaDR2-1] 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.

[Anderson2012-2] 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.

[Gray1987-3] Gray, R. O.; Garrison, R. F. (December 1987), "The Early A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation", Astrophysical Journal Supplement, 65: 581, Bibcode:1987ApJS...65..581G, doi:10.1086/191237.

[Abt1995-4] Abt, Helmut A.; Morrell, Nidia I. (July 1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars", Astrophysical Journal Supplement, 99: 135, Bibcode:1995ApJS...99..135A, doi:10.1086/192182.

[gullikson2016-5] Gullikson, Kevin; Kraus, Adam; Dodson-Robinson, Sarah (2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", The Astronomical Journal, 152 (2): 40, arXiv:1604.06456, Bibcode:2016AJ....152...40G, doi:10.3847/0004-6256/152/2/40, S2CID 119179065.

[diBenedetto1998-6] Benedetto, G. P. (November 1998), "Towards a fundamental calibration of stellar parameters of A, F, G, K dwarfs and giants", Astronomy and Astrophysics, 339: 858–871, Bibcode:1998A&A...339..858D.

[SIMBAD-7] "c02 Cen". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-03-03.

[Eggleton2008-8] 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.

[Molaro1984-9] Molaro, P.; Morossi, C.; Ramella, M.; Franco, M. (July 1984), "IUE spectra of three A0 V stars rotating close to their break-up velocity: HD 119921, HD 129685, HD 181296", ESA Fourth European IUE Conf, 218: 223–225, Bibcode:1984ESASP.218..223M.