# HD 102365

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Binary star system in the constellation Centaurus

HD 102365 Location of HD 102365 (circled in red) Observation data Epoch J2000 Equinox ICRS Constellation Centaurus[1] A Right ascension 11h 46m 31.07253s[2] Declination −40° 30′ 01.2859″[2] Apparent magnitude (V) 4.88[3] B Right ascension 11h 46m 32.68988s[4] Declination −40° 29′ 47.6048″[4] Apparent magnitude (V) 15[5] Characteristics Spectral type G2V[6] + M4V[7] U−B color index 0.10[3] B−V color index 0.67[3] Astrometry A Radial velocity (Rv) 16.94±0.12[2] km/s Proper motion (μ) RA: −1530.971 mas/yr[2] Dec.: +403.287 mas/yr[2] Parallax (π) 107.3024±0.0873 mas[2] Distance 30.40 ± 0.02 ly (9.319 ± 0.008 pc) Absolute magnitude (MV) 5.07[8] B Radial velocity (Rv) 17.23±0.27[4] km/s Proper motion (μ) RA: −1534.679 mas/yr[4] Dec.: +381.396 mas/yr[4] Parallax (π) 107.4237±0.0351 mas[4] Distance 30.362 ± 0.010 ly (9.309 ± 0.003 pc) Details A Mass 0.79+0.03 −0.02[9] M☉ Radius 0.99±0.02[10] R☉ Luminosity 0.86±0.05[10] L☉ Habitable zone inner limit 0.887[9] AU Habitable zone outer limit 1.573[9] AU Surface gravity (log g) 4.44±0.03[10] cgs Temperature 5,594+49 −50[10] K Metallicity [Fe/H] −0.34±0.04[9] dex Rotation 36.4±7.3[9] days Rotational velocity (v sin i) 0.5[11] km/s Age 11.0±0.9[12] Gyr B Mass 0.192[13] M☉ Other designations 66 G. Cen, CD−39°7301, GJ 442, HD 102365, HIP 57443, HR 4523, SAO 223020, LHS 311, LTT 4373, PLX 2725.00[14][15] B: LHS 313, VB 5 Database references SIMBAD A B Exoplanet Archive data ARICNS data

**HD 102365** (**66 G. Centauri**) is a [binary star](/source/Binary_star) system that is located in the northeastern part of the [Centaurus](/source/Centaurus) [constellation](/source/Constellation), at a distance of about 30.4 [light-years](/source/Light-year) (9.3 [parsecs](/source/Parsec)) from the [Solar System](/source/Solar_System). The larger member of the system is a G-type star that is smaller than the [Sun](/source/Sun) but of similar mass. It has a [common proper motion](/source/Common_proper_motion) companion that was discovered by [W. J. Luyten](/source/Willem_Jacob_Luyten) in 1960.[7] This M-type star appears to be in a wide orbit around the primary at a current separation of about 211 [astronomical units](/source/Astronomical_unit) (AU),[7] (or 211 times the separation of the Earth from the Sun). By comparison, [Neptune](/source/Neptune) orbits at an average distance of 30 AU.

## Description

The [stellar classification](/source/Stellar_classification) for the primary star in this system is G2V;[6] the same as the Sun. That of the [red dwarf](/source/Red_dwarf) companion is M4V.[7] The primary star has an estimated 84% the [mass of the Sun](/source/Solar_mass), 99% of the [Sun's radius](/source/Solar_radius), and 86% of the [Sun's luminosity](/source/Solar_luminosity).[10] It is a slow rotator, with a [projected rotational velocity](/source/Stellar_rotation) of 0.5 km/s.[11] The system is believed to be ancient, with modern estimates of the age between 11.0[12] and 13.1 billion years,[16] over double that of the Solar System. Compared to the Sun, it only has about 52% of the abundance of elements other than hydrogen and helium; what astronomers term the [metallicity](/source/Metallicity) of a star.[17]

This star system has a relatively large proper motion.[14] The HR 4523 system is presently located within the [Epsilon Indi Moving Group](/source/Epsilon_Indi_Moving_Group), although it gives itself away as an interloper, since the star is older and has a different composition than the group members.[18] It has [space velocity](/source/Space_velocity_(astronomy)) components [*U*, *V*, *W*] = [−67, −40, +4] km/s.[19]

## Search for planets

The primary star has been believed to be orbited by a Neptune-like planet with a [minimum mass](/source/Minimum_mass) 9.3 times that of the Earth.[20] The orbital period of this planet is 122.1 days. No other planets have been discovered orbiting this star.[21] Initially detected in 2012 by [Doppler spectroscopy](/source/Doppler_spectroscopy) (radial velocity method),[21] a 2013 study was unable to confirm this planet,[22] but it was detected again in a 2023 study. Evidence suggested the radial velocity variations are indeed caused from the orbital motion of a planet, and not from intrinsic processes arising from the star.[20]: 27 However, it was again undetected in [ESPRESSO](/source/ESPRESSO) observations taken by a 2025 study, which found evidence that the radial velocity variations instead arise from the star's [magnetic field](/source/Magnetic_field).[9] Similarly, another 2025 paper also reported a non-detection.[23] The [NASA Exoplanet Archive](/source/NASA_Exoplanet_Archive) demoted the planet to false positive status in April 2026.[24]

An examination of this system in the [infrared](/source/Infrared) did not reveal an [excess emission](/source/Infrared_excess) that would otherwise suggest the presence of a circumstellar [debris disk](/source/Debris_disk).[25]

## References

1. **[^](#cite_ref-constellation_1-0)** [Roman, Nancy G.](/source/Nancy_Roman) (1987). ["Identification of a constellation from a position"](https://doi.org/10.1086%2F132034). *[Publications of the Astronomical Society of the Pacific](/source/Publications_of_the_Astronomical_Society_of_the_Pacific)*. **99** (617): 695. [Bibcode](/source/Bibcode_(identifier)):[1987PASP...99..695R](https://ui.adsabs.harvard.edu/abs/1987PASP...99..695R). [doi](/source/Doi_(identifier)):[10.1086/132034](https://doi.org/10.1086%2F132034). [Constellation record for this object](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?source=VI%2F42%2Fout&%2F%2Ftables=VI%2F42%2Fout&-c=HD+102365&-c.eq=J2000&-c.r=++2&-c.u=arcmin&-c.geom=r&-source=&-source=VI%2F42%2Fout&-out=RA1875&-out=DE1875&-out=Cst) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-GaiaDR3a_2-0) [***b***](#cite_ref-GaiaDR3a_2-1) [***c***](#cite_ref-GaiaDR3a_2-2) [***d***](#cite_ref-GaiaDR3a_2-3) [***e***](#cite_ref-GaiaDR3a_2-4) Vallenari, A.; et al. (Gaia collaboration) (2023). ["*Gaia* Data Release 3. Summary of the content and survey properties"](https://doi.org/10.1051%2F0004-6361%2F202243940). *Astronomy and Astrophysics*. **674**: A1. [arXiv](/source/ArXiv_(identifier)):[2208.00211](https://arxiv.org/abs/2208.00211). [Bibcode](/source/Bibcode_(identifier)):[2023A&A...674A...1G](https://ui.adsabs.harvard.edu/abs/2023A&A...674A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202243940](https://doi.org/10.1051%2F0004-6361%2F202243940). [S2CID](/source/S2CID_(identifier)) [244398875](https://api.semanticscholar.org/CorpusID:244398875). [Gaia DR3 record for this source](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-source=+I%2F355&-from=nav&-nav=cat%3AI%2F355%26tab%3A%7BI%2F355%2Fgaiadr3%7D%26key%3Asource%3D1355%2Fgaiadr3%26HTTPPRM%3A%26-out.add%3D.%26Source%3D%3D%3D5381537023379295232%26-go+%25%23Sesame%23%25%26) at [VizieR](/source/VizieR).

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## External links

- [*HR 4523 AB*](https://web.archive.org/web/20010425205359/http://solstation.com/stars/hr4523ab.htm), SolStation, archived from [the original](http://www.solstation.com/stars/hr4523ab.htm) on April 25, 2001, retrieved 2011-10-11

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 102365](https://en.wikipedia.org/wiki/HD_102365) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/HD_102365?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.