# HD 105382

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Star in the constellation Centaurus

HD 105382 Location of HD 105382 (invisible beside δ Centauri at this scale) Observation data Epoch J2000 Equinox J2000 Constellation Centaurus Right ascension 12h 08m 05.22401s[1] Declination −50° 39′ 40.5728″[1] Apparent magnitude (V) 4.47[2] Characteristics Spectral type B6III[3] U−B color index −0.67[2] B−V color index −0.15[2] Variable type rotating variable[4] Astrometry Radial velocity (Rv) 16.5[2] km/s Proper motion (μ) RA: −35.16[1] mas/yr Dec.: −6.47[1] mas/yr Parallax (π) 7.44±0.61 mas[1] Distance 440 ± 40 ly (130 ± 10 pc) Absolute magnitude (MV) −1.2±0.3[3] Absolute bolometric magnitude (Mbol) −2.9 ± 0.4[3] Details Mass 5.7 ± 0.4[4] M☉ Radius 3.0 ± 0.6[4] R☉ Luminosity 1000+590 −370[3] L☉ Surface gravity (log g) 4.18 ± 0.15[4] cgs Temperature 17400 ± 400[4] K Rotation 1.295 ± 0.001[4] days Rotational velocity (v sin i) 90[3] km/s Other designations CD−49°6813, HD 105382, HIP 59173, HR 4618, SAO 239687[2] Database references SIMBAD data

**HD 105382** (also known as **V863 Centauri**) is a [star](/source/Star) in the [constellation](/source/Constellation) [Centaurus](/source/Centaurus_(constellation)). Its [apparent magnitude](/source/Apparent_magnitude) is 4.47, making it visible to the [naked eye](/source/Naked_eye) under good observing conditions. From [parallax](/source/Parallax) measurements, it is located 130 [parsecs](/source/Parsecs) (440 [light years](/source/Light_year)) from the Sun.

A [light curve](/source/Light_curve) for V863 Centauri, plotted from *[Hipparcos](/source/Hipparcos)* data[5]

In 1992, Luis A. Balona *et al.* announced their discovery that HD 105382 is a [variable star](/source/Variable_star).[6] It was given its [variable star designation](/source/Variable_star_designation), V863 Centauri, in 1993.[7] HD 105382's apparent magnitude varies with an amplitude of 0.012 over a period of 1.295 days. It has been previously classified as a [Be star](/source/Be_star), which would explain the variability as stellar pulsations, but this classification was probably due to accidental observation of the nearby Be star [δ Centauri](/source/%CE%94_Centauri).[8] A 2004 study showed that the 1.295 day period is actually the [rotation](/source/Stellar_rotation) period of the star, and that the variability is caused by non-homogeneous distribution of elements in the stellar surface. In particular, HD 105382 is a helium-weak [chemically peculiar star](/source/Chemically_peculiar_star) with a helium abundance varying between 0.5% and 15% of the solar abundance, and a silicon abundance varying between 0.00044% and 0.0069% the solar value. Regions with more helium appear to coincide with the regions with less silicon, and vice versa.[4] This peculiar abundance pattern is probably related to HD 105382's [magnetic field](/source/Stellar_magnetic_field),[4] which has a polar strength of 2.3 [kG](/source/Gauss_(unit)).[3]

From [astrometric](/source/Astrometry) measurements by the [Hipparcos](/source/Hipparcos) spacecraft, HD 105382 is identified as a probable [astrometric binary](/source/Astrometric_binary).[9] It is only 267" away from δ Centauri, and both stars appear to be at the same distance from Earth and have the same motion through space, so they may be related. In total, this may be a five star system.[10] It is a member of the Lower Centaurus–Crux (LCC) subgroup of the [Scorpius–Centaurus association](/source/Scorpius%E2%80%93Centaurus_association).[11]

## References

1. ^ [***a***](#cite_ref-vanLeeuwen2007_1-0) [***b***](#cite_ref-vanLeeuwen2007_1-1) [***c***](#cite_ref-vanLeeuwen2007_1-2) [***d***](#cite_ref-vanLeeuwen2007_1-3) [***e***](#cite_ref-vanLeeuwen2007_1-4) van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", *Astronomy and Astrophysics*, **474** (2): 653–664, [arXiv](/source/ArXiv_(identifier)):[0708.1752](https://arxiv.org/abs/0708.1752), [Bibcode](/source/Bibcode_(identifier)):[2007A&A...474..653V](https://ui.adsabs.harvard.edu/abs/2007A&A...474..653V), [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20078357](https://doi.org/10.1051%2F0004-6361%3A20078357), [S2CID](/source/S2CID_(identifier)) [18759600](https://api.semanticscholar.org/CorpusID:18759600).

1. ^ [***a***](#cite_ref-SIMBAD_2-0) [***b***](#cite_ref-SIMBAD_2-1) [***c***](#cite_ref-SIMBAD_2-2) [***d***](#cite_ref-SIMBAD_2-3) [***e***](#cite_ref-SIMBAD_2-4) ["HD 105382"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+105382). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 25 October 2017.

1. ^ [***a***](#cite_ref-Petit2013_3-0) [***b***](#cite_ref-Petit2013_3-1) [***c***](#cite_ref-Petit2013_3-2) [***d***](#cite_ref-Petit2013_3-3) [***e***](#cite_ref-Petit2013_3-4) [***f***](#cite_ref-Petit2013_3-5) Petit, V.; et al. (February 2013), "A magnetic confinement versus rotation classification of massive-star magnetospheres", *Monthly Notices of the Royal Astronomical Society*, **429** (1): 398–422, [arXiv](/source/ArXiv_(identifier)):[1211.0282](https://arxiv.org/abs/1211.0282), [Bibcode](/source/Bibcode_(identifier)):[2013MNRAS.429..398P](https://ui.adsabs.harvard.edu/abs/2013MNRAS.429..398P), [doi](/source/Doi_(identifier)):[10.1093/mnras/sts344](https://doi.org/10.1093%2Fmnras%2Fsts344), [S2CID](/source/S2CID_(identifier)) [14961579](https://api.semanticscholar.org/CorpusID:14961579).

1. ^ [***a***](#cite_ref-Briquet2004_4-0) [***b***](#cite_ref-Briquet2004_4-1) [***c***](#cite_ref-Briquet2004_4-2) [***d***](#cite_ref-Briquet2004_4-3) [***e***](#cite_ref-Briquet2004_4-4) [***f***](#cite_ref-Briquet2004_4-5) [***g***](#cite_ref-Briquet2004_4-6) [***h***](#cite_ref-Briquet2004_4-7) Briquet, M.; et al. (January 2004). ["He and Si surface inhomogeneities of four Bp variable stars"](https://doi.org/10.1051%2F0004-6361%3A20031450). *Astronomy and Astrophysics*. **413**: 273–283. [Bibcode](/source/Bibcode_(identifier)):[2004A&A...413..273B](https://ui.adsabs.harvard.edu/abs/2004A&A...413..273B). [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20031450](https://doi.org/10.1051%2F0004-6361%3A20031450).

1. **[^](#cite_ref-HipDataAccess_5-0)** ["Hipparcos Tools Interactive Data Access"](https://www.cosmos.esa.int/web/hipparcos/interactive-data-access). *Hipparcos*. ESA. Retrieved 8 December 2021.

1. **[^](#cite_ref-Balona1992_6-0)** Balona, L. A.; Cuypers, J.; Marang, F. (February 1992). ["Intensive photometry of southern Be variables. II. Summer objects"](https://articles.adsabs.harvard.edu/pdf/1992A%26AS...92..533B). *Astronomy and Astrophysics, Suppl. Ser*. **92**: 533–563. [Bibcode](/source/Bibcode_(identifier)):[1992A&AS...92..533B](https://ui.adsabs.harvard.edu/abs/1992A&AS...92..533B). Retrieved 20 January 2025.

1. **[^](#cite_ref-Kazarovets1993_7-0)** Kazarovets, E. V.; Samus, N. N.; Goranskij, V. P. (February 1993). ["The 71st Name-List of Variable Stars"](https://ibvs.konkoly.hu/pub/ibvs/3801/3840.pdf) (PDF). *Information Bulletin on Variable Stars*. **3840**: 1–27. [Bibcode](/source/Bibcode_(identifier)):[1993IBVS.3840....1K](https://ui.adsabs.harvard.edu/abs/1993IBVS.3840....1K). Retrieved 20 January 2025.

1. **[^](#cite_ref-Briquet2001_8-0)** Briquet, M.; Aerts, C.; De Cat, P. (January 2001). ["Optical variability of the B-type star HD 105382: Pulsation or rotation?"](https://doi.org/10.1051%2F0004-6361%3A20000193). *Astronomy and Astrophysics*. **366**: 121–128. [Bibcode](/source/Bibcode_(identifier)):[2001A&A...366..121B](https://ui.adsabs.harvard.edu/abs/2001A&A...366..121B). [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20000193](https://doi.org/10.1051%2F0004-6361%3A20000193).

1. **[^](#cite_ref-Makarov2005_9-0)** Makarov, V. V.; Kaplan, G. H. (May 2005), "Statistical Constraints for Astrometric Binaries with Nonlinear Motion", *The Astronomical Journal*, **129** (5): 2420–2427, [Bibcode](/source/Bibcode_(identifier)):[2005AJ....129.2420M](https://ui.adsabs.harvard.edu/abs/2005AJ....129.2420M), [doi](/source/Doi_(identifier)):[10.1086/429590](https://doi.org/10.1086%2F429590).

1. **[^](#cite_ref-Eggleton2008_10-0)** Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", *[Monthly Notices of the Royal Astronomical Society](/source/Monthly_Notices_of_the_Royal_Astronomical_Society)*, **389** (2): 869–879, [arXiv](/source/ArXiv_(identifier)):[0806.2878](https://arxiv.org/abs/0806.2878), [Bibcode](/source/Bibcode_(identifier)):[2008MNRAS.389..869E](https://ui.adsabs.harvard.edu/abs/2008MNRAS.389..869E), [doi](/source/Doi_(identifier)):[10.1111/j.1365-2966.2008.13596.x](https://doi.org/10.1111%2Fj.1365-2966.2008.13596.x), [S2CID](/source/S2CID_(identifier)) [14878976](https://api.semanticscholar.org/CorpusID:14878976).

1. **[^](#cite_ref-deGeus1989_11-0)** de Geus, E. J.; de Zeeuw, P. T.; Lub, J. (June 1989), "Physical parameters of stars in the Scorpio-Centaurus OB association", *Astronomy and Astrophysics*, **216** (1–2): 44–61, [Bibcode](/source/Bibcode_(identifier)):[1989A&A...216...44D](https://ui.adsabs.harvard.edu/abs/1989A&A...216...44D)

v t e Constellation of Centaurus List of stars in Centaurus Centaurus in Chinese astronomy Stars Bayer α A (Rigil Kentaurus) B (Toliman) C (Proxima Centauri) β (Hadar) γ δ ε ζ (Leepwal) η θ (Menkent) ι (Kulou) κ λ μ ν (Heng) ξ1 ξ2 ο1 ο2 π ρ σ τ υ1 υ2 φ χ ψ x1 x2 C3 D E F G H J K M N Q Flamsteed 1 (i) 2 (g) 3 (k) 4 (h) Variable R T V Y RR SV SX BV DY UY V346 V553 V744 V752 V761 (a) V763 (C1) V766 V779 (Krzemiński's star) V803 V810 V816 (Przybylski's Star) V831 V842 V885 V886 V863 V1032 V1369 V1400 V1935 HR 4460 (A) 4466 (C2) 4499 4522 4523 4537 (j) 4546 (B) 4721 4748 (u) 4796 4817 (l) 4831 (w) 4874 (p) 4888 (e) 4889 (n) 4940 (f) 4979 4989 5006 (r) 5041 (m) 5089 (d) 5174 (z) 5222 (y) 5224 5241 5297 5358 (v) 5371 5471 (b) 5485 (c1) 5489 (c2) HD 97413 98176 100453 101581 101930 102117 (Uklun) 103197 107914 108236 109749 110113 113538 113766 114386 114729 115600 116434 (Matza) 117207 117618 (Dofida) 117939 120411 121228 121504 124448 (Popper's Star) 125072 125595 131399 Other 2MASS J1126−5003 2M1207 Gaia BH2 HD 131399 Ab PSR B1259−63 PSR J1311−3430 TOI-763 WASP-15 (Nyamien) WASP-41 WASP-42 WASP-167/KELT-13 Exoplanets 2M1207b b Centauri b HD 101930 b HD 102117 b (Leklsullun) HD 103197 b HD 109749 b HD 113538 b c HD 114386 b HD 114729 b HD 117207 b HD 117618 b (Noifasui) HD 121504 b HIP 65426 b (Najsakopajk) HIP 67522 b NGTS-13b Proxima Centauri b c d WASP-15b (Asye) Star clusters NGC 3766 4230 4507 5281 5286 5316 5460 5617 5662 Other IC 2944 ω Centauri Scorpius–Centaurus association Stock 16 Nebulae NGC 3918 5307 Other Boomerang Nebula Fleming 1 G292.0+1.8 G306.3-0.9 Gum 41 IC 2944 IRAS 13208−6020 RCW 79 RCW 86 Southern Crab Nebula SuWt 2 Galaxies NGC 3557 3568 3749 3783 4444 4603 4622 4650A 4683 4696 4706 4709 4729 4730 4743 4744 4909 4930 4945 4976 5011 A 5026 5064 5082 5090 5091 5102 5114 5121 5128 (Centaurus A) 5161 5206 5253 5266 5291 5398 5408 5419 5483 5516 Other ESO 269-57 ESO 325-4 ESO 383-76 ESO 444-46 Fourcade-Figueroa Object IC 3370 IC 4214 IC 4329A IRAS 13224−3809 J1144−4308 LEDA 677373 PKS 1144−379 PKS 1353−341 PKS 1424−418 Galaxy clusters Abell S740 Centaurus Cluster Shapley Supercluster Astronomical events GW190521 SN 185 SN 1895B (Z) SN 1972E SN 1986G J1407b SN 2019so Category

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