# HD 125595

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Star in the constellation Centaurus

HD 125595 Observation data Epoch J2000.0 Equinox J2000.0 Constellation Centaurus Right ascension 14h 21m 23.186s[1] Declination −40° 23′ 38.22″[1] Apparent magnitude (V) 9.03[2] Characteristics Evolutionary stage Main sequence Spectral type K4V(k)[3] Apparent magnitude (B) 10.137[2] Apparent magnitude (J) 7.097±0.021[2] Apparent magnitude (H) 6.608±0.026[2] Apparent magnitude (K) 6.447±0.023[2] B−V color index 1.107±0.006[2] Astrometry Radial velocity (Rv) +4.48±0.45[1] km/s Proper motion (μ) RA: −561.636[1] mas/yr Dec.: −68.516[1] mas/yr Parallax (π) 35.4337±0.0762 mas[1] Distance 92.0 ± 0.2 ly (28.22 ± 0.06 pc) Absolute magnitude (MV) 6.80[2] Details Mass 0.77[4] M☉ Radius 0.73+0.02 −0.03[1] R☉ Luminosity 0.241[1] L☉ Surface gravity (log g) 4.58[4] cgs Temperature 4,672[4] K Metallicity [Fe/H] 0.13[4] dex Rotation 37.2±2.0 d[5] Rotational velocity (v sin i) 1.50[6] km/s Age 8.17[4] Gyr Other designations CD−39°8857, GJ 545.1, HD 125595, HIP 70170, PPM 319432, LHS 2900, LPM 523, LTT 5648, NLTT 37029, GCRV 64739 Database references SIMBAD data Exoplanet Archive data

**HD 125595** is a [star](/source/Star) with a close [Neptunian](/source/Neptune)[6] companion in the southern [constellation](/source/Constellation) of [Centaurus](/source/Centaurus). With an [apparent visual magnitude](/source/Apparent_visual_magnitude) of 9.03,[2] this star is too faint to be viewed with the naked eye. It is located at a distance of 92 [light years](/source/Light_year) from the [Sun](/source/Sun) based on [parallax](/source/Stellar_parallax) measurements, and is drifting further away with a [radial velocity](/source/Radial_velocity) of +4.5 km/s.[1] The star has a high [proper motion](/source/Proper_motion), traversing the [celestial sphere](/source/Celestial_sphere) and an [angular rate](/source/Angular_rate) of 0.57 arcsecond yr−1.[7]

This is an ordinary [K-type main-sequence star](/source/K-type_main-sequence_star) with a [stellar classification](/source/Stellar_classification) of K4V(k),[3] which indicates it is a small star that is generating energy at its [core](/source/Stellar_core) through [hydrogen fusion](/source/Hydrogen_fusion). It is about eight[4] billion years old and is spinning with a [projected rotational velocity](/source/Projected_rotational_velocity) of 1.5 km/s,[6] giving it a 37 day [rotation period](/source/Rotation_period).[5] The star shows a moderate level of [chromospherically activity](/source/Magnetic_activity) due to [star spots](/source/Star_spot) or [plagues](/source/Plage_(astronomy)).[6] It is smaller, cooler, dimmer, and less massive than the Sun, but shows a higher atmospheric metallicity.[4]

## Planetary system

In 2018 an [exoplanet](/source/Exoplanet) companion was announced by the [HARPS](/source/High_Accuracy_Radial_Velocity_Planet_Searcher) program, using the [radial velocity](/source/Radial_velocity) method. It is a Neptune-mass object orbiting 0.081 [AU](/source/Astronomical_unit) (12.1 [Gm](/source/Gigametre)) from the host star with a [period](/source/Orbital_period) of 9.7 days.[6]

The HD 125595 planetary system[6] Companion (in order from star) Mass Semimajor axis (AU) Orbital period (days) Eccentricity Inclination (°) Radius b ≥ 0.042±0.004 MJ 0.0809±0.0014 9.6737±0.0039 0.0 — —

## See also

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

## References

1. ^ [***a***](#cite_ref-GaiaDR2_1-0) [***b***](#cite_ref-GaiaDR2_1-1) [***c***](#cite_ref-GaiaDR2_1-2) [***d***](#cite_ref-GaiaDR2_1-3) [***e***](#cite_ref-GaiaDR2_1-4) [***f***](#cite_ref-GaiaDR2_1-5) [***g***](#cite_ref-GaiaDR2_1-6) [***h***](#cite_ref-GaiaDR2_1-7) [***i***](#cite_ref-GaiaDR2_1-8) [Brown, A. G. A.](/source/Anthony_Brown_(scientist)); et al. ([Gaia collaboration](/source/Data_Processing_and_Analysis_Consortium)) (August 2018). ["*Gaia* Data Release 2: Summary of the contents and survey properties"](https://doi.org/10.1051%2F0004-6361%2F201833051). *[Astronomy & Astrophysics](/source/Astronomy_%26_Astrophysics)*. **616**. A1. [arXiv](/source/ArXiv_(identifier)):[1804.09365](https://arxiv.org/abs/1804.09365). [Bibcode](/source/Bibcode_(identifier)):[2018A&A...616A...1G](https://ui.adsabs.harvard.edu/abs/2018A&A...616A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201833051](https://doi.org/10.1051%2F0004-6361%2F201833051). [Gaia DR2 record for this source](https://vizier.u-strasbg.fr/viz-bin/VizieR-S?Gaia%20DR2%206104435819513399168) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-Anderson_Francis_2012_2-0) [***b***](#cite_ref-Anderson_Francis_2012_2-1) [***c***](#cite_ref-Anderson_Francis_2012_2-2) [***d***](#cite_ref-Anderson_Francis_2012_2-3) [***e***](#cite_ref-Anderson_Francis_2012_2-4) [***f***](#cite_ref-Anderson_Francis_2012_2-5) [***g***](#cite_ref-Anderson_Francis_2012_2-6) [***h***](#cite_ref-Anderson_Francis_2012_2-7) Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". *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). [S2CID](/source/S2CID_(identifier)) [119257644](https://api.semanticscholar.org/CorpusID:119257644).

1. ^ [***a***](#cite_ref-Gray_et_al_2006_3-0) [***b***](#cite_ref-Gray_et_al_2006_3-1) Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2006-07-01). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample". *The Astronomical Journal*. **132** (1): 161–170. [arXiv](/source/ArXiv_(identifier)):[astro-ph/0603770](https://arxiv.org/abs/astro-ph/0603770). [Bibcode](/source/Bibcode_(identifier)):[2006AJ....132..161G](https://ui.adsabs.harvard.edu/abs/2006AJ....132..161G). [doi](/source/Doi_(identifier)):[10.1086/504637](https://doi.org/10.1086%2F504637). [ISSN](/source/ISSN_(identifier)) [0004-6256](https://search.worldcat.org/issn/0004-6256). [S2CID](/source/S2CID_(identifier)) [119476992](https://api.semanticscholar.org/CorpusID:119476992).

1. ^ [***a***](#cite_ref-Luck2018_4-0) [***b***](#cite_ref-Luck2018_4-1) [***c***](#cite_ref-Luck2018_4-2) [***d***](#cite_ref-Luck2018_4-3) [***e***](#cite_ref-Luck2018_4-4) [***f***](#cite_ref-Luck2018_4-5) [***g***](#cite_ref-Luck2018_4-6) Luck, R. Earle (March 2018). ["Abundances in the Local Region. III. Southern F, G, and K Dwarfs"](https://doi.org/10.3847%2F1538-3881%2Faaa9b5). *The Astronomical Journal*. **155** (3): 31. [Bibcode](/source/Bibcode_(identifier)):[2018AJ....155..111L](https://ui.adsabs.harvard.edu/abs/2018AJ....155..111L). [doi](/source/Doi_(identifier)):[10.3847/1538-3881/aaa9b5](https://doi.org/10.3847%2F1538-3881%2Faaa9b5). [S2CID](/source/S2CID_(identifier)) [125765376](https://api.semanticscholar.org/CorpusID:125765376). 111.

1. ^ [***a***](#cite_ref-mnras452_3_2745_5-0) [***b***](#cite_ref-mnras452_3_2745_5-1) Suárez Mascareño, A.; et al. (September 2015). ["Rotation periods of late-type dwarf stars from time series high-resolution spectroscopy of chromospheric indicators"](https://doi.org/10.1093%2Fmnras%2Fstv1441). *Monthly Notices of the Royal Astronomical Society*. **452** (3): 2745–2756. [arXiv](/source/ArXiv_(identifier)):[1506.08039](https://arxiv.org/abs/1506.08039). [Bibcode](/source/Bibcode_(identifier)):[2015MNRAS.452.2745S](https://ui.adsabs.harvard.edu/abs/2015MNRAS.452.2745S). [doi](/source/Doi_(identifier)):[10.1093/mnras/stv1441](https://doi.org/10.1093%2Fmnras%2Fstv1441). [S2CID](/source/S2CID_(identifier)) [119181646](https://api.semanticscholar.org/CorpusID:119181646).

1. ^ [***a***](#cite_ref-Ségransan2011_6-0) [***b***](#cite_ref-Ségransan2011_6-1) [***c***](#cite_ref-Ségransan2011_6-2) [***d***](#cite_ref-Ségransan2011_6-3) [***e***](#cite_ref-Ségransan2011_6-4) [***f***](#cite_ref-Ségransan2011_6-5) Ségransan, D.; et al. (2011). ["The HARPS search for southern extra-solar planets. XXIX. Four new planets in orbit around the moderately active dwarfs HD 63765, HD 104067, HD 125595, and HIP 70849"](http://www.aanda.org/articles/aa/full_html/2011/11/aa13580-09/aa13580-09.html). *Astronomy and Astrophysics*. **535**. A54. [arXiv](/source/ArXiv_(identifier)):[1107.0339](https://arxiv.org/abs/1107.0339). [Bibcode](/source/Bibcode_(identifier)):[2011A&A...535A..54S](https://ui.adsabs.harvard.edu/abs/2011A&A...535A..54S). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/200913580](https://doi.org/10.1051%2F0004-6361%2F200913580). [S2CID](/source/S2CID_(identifier)) [119197766](https://api.semanticscholar.org/CorpusID:119197766).

1. **[^](#cite_ref-Bakos_et_al_2002_7-0)** Bakos, Gáspár Á.; et al. (July 2002). "Revised Coordinates and Proper Motions of the Stars in the Luyten Half-Second Catalog". *The Astrophysical Journal Supplement Series*. **141** (1): 187–193. [arXiv](/source/ArXiv_(identifier)):[astro-ph/0202164](https://arxiv.org/abs/astro-ph/0202164). [Bibcode](/source/Bibcode_(identifier)):[2002ApJS..141..187B](https://ui.adsabs.harvard.edu/abs/2002ApJS..141..187B). [doi](/source/Doi_(identifier)):[10.1086/340115](https://doi.org/10.1086%2F340115). [S2CID](/source/S2CID_(identifier)) [36667868](https://api.semanticscholar.org/CorpusID:36667868).

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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