# HD 101930

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Star in the constellation Centaurus

HD 101930 Observation data Epoch J2000 Equinox J2000 Constellation Centaurus[1] Right ascension 11h 43m 30.11338s[2] Declination −58° 00′ 24.7787″[2] Apparent magnitude (V) 8.21[1] Characteristics Evolutionary stage main sequence[3] Spectral type K2 V+[4] B−V color index +0.91[5] Astrometry Radial velocity (Rv) +18.36[6] km/s Proper motion (μ) RA: +16.680 mas/yr[2] Dec.: +349.125 mas/yr[2] Parallax (π) 33.3814±0.0180 mas[2] Distance 97.71 ± 0.05 ly (29.96 ± 0.02 pc) Absolute magnitude (MV) +5.88[1] Details Radius 0.87+0.05 −0.04[7] R☉ Luminosity 0.43±0.01[8] L☉ Surface gravity (log g) 4.40±0.11[9] cgs Temperature 5,079±62[6] K Metallicity [Fe/H] +0.1±0.03[10] dex Rotational velocity (v sin i) 2[11] km/s Age 5.4±4.4[8] Gyr Other designations CD−57°4096, GJ 3683, HIP 57172, LTT 4350, NLTT 28356, SAO 239322[12] Database references SIMBAD data ARICNS data

**HD 101930**, also known as **GJ 3683**, is an orange hued [star](/source/Star) with an orbiting [exoplanet](/source/Exoplanet) located in the southern [constellation](/source/Constellation) [Centaurus](/source/Centaurus). It has an [apparent magnitude](/source/Apparent_magnitude) of 8.21,[1] making it faintly visible in [binoculars](/source/Binoculars) but not to the [naked eye](/source/Naked_eye). The system is located relatively close at a distance of 98 [light years](/source/Light_year)[2] but is receding with a heliocentric [radial velocity](/source/Radial_velocity) of 18.4 [km/s](/source/Metre_per_second).[6] It has a relatively large [proper motion](/source/Proper_motion), traversing the [celestial sphere](/source/Celestial_sphere) with an [angular velocity](/source/Angular_velocity) of 0.320[″](/source/Second_of_arc)·yr−1.[13]

## Description

HD 101930 has a [stellar classification](/source/Stellar_classification) of K2 V+,[4] indicating that it is an ordinary [K-type main-sequence star](/source/K-type_main-sequence_star). It has an estimated age of 5.4 [billion years](/source/Billion_years),[8] which is slightly older than the [Sun](/source/Sun). The object has 87% the [radius of the Sun](/source/Radius_of_the_Sun)[7] and an [effective temperature](/source/Effective_temperature) of 5,079 [K](/source/Kelvin).[6] When combined, these parameters yield a [luminosity](/source/Luminosity) 43% that of the [Sun](/source/Sun) from its [photosphere](/source/Photosphere).[8] As expected with planetary hosts, HD 101930 is metal enriched, having a [metallicity](/source/Metallicity) 26% above solar levels.[10] The star's [projected rotational velocity](/source/Projected_rotational_velocity) is similar to the Sun's, having a value of 2 [km/s](/source/Metre_per_second).[11]

A 2007 multicity survey found a co-moving companion located 73[″](/source/Second_of_arc) away,[14] making it a [binary star](/source/Binary_star). It has a class of M0-1[15] and a [mass](/source/Mass) of 0.7 [M☉](/source/Solar_mass).[14]

## Planetary system

In 2005, the discovery of an exoplanet orbiting the star was announced. This is another discovery using the [radial velocity method](/source/Radial_velocity_method) with the [HARPS spectrograph](/source/HARPS_spectrograph). As the [inclination](/source/Inclination) of the [orbital plane](/source/Orbital_plane) is unknown, only a lower bound on the mass can be determined. It has at least 30% of the [mass of Jupiter](/source/Mass_of_Jupiter).[6]

The HD 101930 planetary system[6] Companion (in order from star) Mass Semimajor axis (AU) Orbital period (days) Eccentricity Inclination (°) Radius b ≥ 0.30 MJ 0.302 70.46 ± 0.18 0.11 ± 0.02 — —

## See also

- [HD 93083](/source/HD_93083)

- [HD 102117](/source/HD_102117)

- [List of extrasolar planets](/source/List_of_extrasolar_planets)

- [HARPS spectrograph](/source/HARPS_spectrograph)

## References

1. ^ [***a***](#cite_ref-Anderson2012_1-0) [***b***](#cite_ref-Anderson2012_1-1) [***c***](#cite_ref-Anderson2012_1-2) [***d***](#cite_ref-Anderson2012_1-3) Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". *[Astronomy Letters](/source/Astronomy_Letters)*. **38** (5): 331. [arXiv](/source/ArXiv_(identifier)):[1108.4971](https://arxiv.org/abs/1108.4971). [Bibcode](/source/Bibcode_(identifier)):[2012AstL...38..331A](https://ui.adsabs.harvard.edu/abs/2012AstL...38..331A). [doi](/source/Doi_(identifier)):[10.1134/S1063773712050015](https://doi.org/10.1134%2FS1063773712050015). [XHIP record for this object](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-ref=VIZ681510a8389ecb&-out.src=V%2F137D%2FXHIP&-nav=cat%3AV%2F137D%26tab%3A{V%2F137D%2FXHIP}%26key%3Asource%3DV%2F137D%2FXHIP%26HTTPPRM%3A&-source=V%2F137D%2FXHIP&-out=HIP&HIP=57172&-out=Comp&-out=Gr&-out=RAJ2000&-out=DEJ2000&-out=Dist&-out=X&-out=Y&-out=Z&-out=SpType&-out=Simbad&-out=Hpmag&-out=Lum&-out=Cst) at [VizieR](/source/VizieR).

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## External links

- ["HD 101930"](https://web.archive.org/web/20160303171249/https://media4.obspm.fr/exoplanets/base/etoile.php?nom=HD+101930). *Exoplanets*. Archived from [the original](http://media4.obspm.fr/exoplanets/base/etoile.php?nom=HD+101930) on 2016-03-03. Retrieved 2009-05-22.

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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Adapted from the Wikipedia article [HD 101930](https://en.wikipedia.org/wiki/HD_101930) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/HD_101930?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.