# HD 72659

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Star in the constellation of Hydra

HD 72659 Observation data Epoch J2000.0 Equinox J2000.0 Constellation Hydra[1] Right ascension 08h 34m 03.18984s[2] Declination −01° 34′ 05.5822″[2] Apparent magnitude (V) 7.46[1] Characteristics Evolutionary stage subgiant[2] Spectral type G2V[3] B−V color index +0.612±0.015[1] Astrometry Radial velocity (Rv) −18.203+0.024 −0.029[4] km/s Proper motion (μ) RA: −112.313(26) mas/yr[2] Dec.: −96.386(18) mas/yr[2] Parallax (π) 19.2582±0.0271 mas[2] Distance 169.4 ± 0.2 ly (51.93 ± 0.07 pc) Absolute magnitude (MV) 3.98[1] Details[4] Mass 1.033±0.025 M☉ Radius 1.36±0.06 R☉ Luminosity 2.16±0.01[5] L☉ Surface gravity (log g) 4.19±0.02[5] cgs Temperature 5,929±61 K Metallicity [Fe/H] −0.02±0.06 dex Rotational velocity (v sin i) 1.6±0.9 km/s Age 8±1 Gyr Other designations BD−01°2075, HD 72659, HIP 42030, SAO 136045, 2MASS J08340320-0134056, Gaia DR2 3073443760538892032[6] Database references SIMBAD data Exoplanet Archive data

**HD 72659** is a [star](/source/Star) in the [equatorial](/source/Celestial_equator) [constellation](/source/Constellation) of [Hydra](/source/Hydra_(constellation)). With an [apparent visual magnitude](/source/Apparent_visual_magnitude) of 7.46,[1] its yellow-hued star is too faint to be viewed with the naked eye. [Parallax](/source/Stellar_parallax) measurements provide a distance estimate of 169.4 [light years](/source/Light_year) from the [Sun](/source/Sun), and it has an [absolute magnitude](/source/Absolute_magnitude) of 3.98.[1] The star is drifting closer with a [radial velocity](/source/Radial_velocity) of −18.2 km/s.[4]

This is a Sun-like [main sequence](/source/Main_sequence) star with a [stellar classification](/source/Stellar_classification) of G2V,[3] indicating that it is generating energy through [core](/source/Stellar_core) [hydrogen fusion](/source/Hydrogen_fusion). It is older than the Sun with an age of about seven billion years,[5] and is spinning with a [projected rotational velocity](/source/Projected_rotational_velocity) of 5.1 km/s.[7] The star has 7% greater mass than the Sun and a 38% larger radius. It is radiating more than double the [Sun's luminosity](/source/Sun's_luminosity) from its [photosphere](/source/Photosphere) at an [effective temperature](/source/Effective_temperature) of 5,956 K.[5] The [metallicity](/source/Metallicity) of the [stellar atmosphere](/source/Stellar_atmosphere) is similar to the Sun.[1]

## Planetary system

An [extrasolar planet](/source/Extrasolar_planet) was discovered orbiting this star in 2003 via the [Doppler method](/source/Doppler_spectroscopy).[8] This is a [superjovian planet](/source/Superjovian_planet) with an eccentric orbit, completing a lap around its host star every 9.9 years.[9] In 2022, the inclination and true mass of HD 72659 b were measured via [astrometry](/source/Astrometry), along with the detection of a second substellar companion, likely a [brown dwarf](/source/Brown_dwarf).[10] The orbit of the brown dwarf lies in the so-called [brown dwarf desert](/source/Brown_dwarf_desert), regions with a deficit of brown dwarfs. The host star is very old and thus HD 72659 b and c can not be [directly imaged](/source/Direct_imaging), even with the most modern equipment such as the [James Webb Space Telescope](/source/James_Webb_Space_Telescope). The moderate eccentricity of planet b may be the result of [Kozai-Lidov oscillations](/source/Kozai_mechanism).[4]

The HD 72659 planetary system[4] Companion (in order from star) Mass Semimajor axis (AU) Orbital period (years) Eccentricity Inclination (°) Radius b 3.0+2.6 −0.1[10] MJ 4.607±0.039 9.72±0.03 0.239±0.001 78±40[10] — c 19.4+0.8 −0.5 MJ 21.5+0.5 −0.4 97.1+3.4 −2.5 0.114+0.002 −0.003 40±2 —

## See also

- [HD 73256](/source/HD_73256)

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

## 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) [***e***](#cite_ref-Anderson2012_1-4) [***f***](#cite_ref-Anderson2012_1-5) [***g***](#cite_ref-Anderson2012_1-6) 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=42030&-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).

1. ^ [***a***](#cite_ref-GaiaDR3_2-0) [***b***](#cite_ref-GaiaDR3_2-1) [***c***](#cite_ref-GaiaDR3_2-2) [***d***](#cite_ref-GaiaDR3_2-3) [***e***](#cite_ref-GaiaDR3_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%3D3073443760538892032%26-go+%25%23Sesame%23%25%26) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-Houk1999_3-0) [***b***](#cite_ref-Houk1999_3-1) Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". *Michigan Spectral Survey*. **5**. [Bibcode](/source/Bibcode_(identifier)):[1999MSS...C05....0H](https://ui.adsabs.harvard.edu/abs/1999MSS...C05....0H).

1. ^ [***a***](#cite_ref-Ruggieri2025_4-0) [***b***](#cite_ref-Ruggieri2025_4-1) [***c***](#cite_ref-Ruggieri2025_4-2) [***d***](#cite_ref-Ruggieri2025_4-3) [***e***](#cite_ref-Ruggieri2025_4-4) Ruggieri, A.; Sozzetti, A.; Desidera, S.; Mesa, D.; Gratton, R.; Marzari, F.; Bonavita, M.; Biazzo, K.; D'Orazi, V.; Ginski, C.; Meyer, M.; Malavolta, L.; Pinamonti, M.; Barbato, D.; Lazzoni, C.; Lanza, A. F.; Mancini, L.; Naponiello, L.; Nardiello, D.; Zingales, T.; Rainer, M.; Scandariato, G.; Giacobbe, P.; Cosentino, R.; Fiorenzano, A.; Claudi, R. (2025). ["The GAPS programme at TNG LXVIII. Characterization of the outer substellar companion around HD 72659 with a multitechnique approach"](https://doi.org/10.1093%2Fmnras%2Fstaf1251). *Monthly Notices of the Royal Astronomical Society*. **542** (2): 1233–1247. [arXiv](/source/ArXiv_(identifier)):[2507.19063](https://arxiv.org/abs/2507.19063). [doi](/source/Doi_(identifier)):[10.1093/mnras/staf1251](https://doi.org/10.1093%2Fmnras%2Fstaf1251).

1. ^ [***a***](#cite_ref-Bonfanti2015_5-0) [***b***](#cite_ref-Bonfanti2015_5-1) [***c***](#cite_ref-Bonfanti2015_5-2) [***d***](#cite_ref-Bonfanti2015_5-3) Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". *Astronomy and Astrophysics*. **575**. A18. [arXiv](/source/ArXiv_(identifier)):[1411.4302](https://arxiv.org/abs/1411.4302). [Bibcode](/source/Bibcode_(identifier)):[2015A&A...575A..18B](https://ui.adsabs.harvard.edu/abs/2015A&A...575A..18B). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201424951](https://doi.org/10.1051%2F0004-6361%2F201424951). [S2CID](/source/S2CID_(identifier)) [54555839](https://api.semanticscholar.org/CorpusID:54555839).

1. **[^](#cite_ref-SIMBAD_6-0)** ["HD 72659"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+72659). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2020-01-24.

1. **[^](#cite_ref-Earle2017_7-0)** Luck, R. Earle (January 2017). ["Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants"](https://doi.org/10.3847%2F1538-3881%2F153%2F1%2F21). *The Astronomical Journal*. **153** (1): 19. [arXiv](/source/ArXiv_(identifier)):[1611.02897](https://arxiv.org/abs/1611.02897). [Bibcode](/source/Bibcode_(identifier)):[2017AJ....153...21L](https://ui.adsabs.harvard.edu/abs/2017AJ....153...21L). [doi](/source/Doi_(identifier)):[10.3847/1538-3881/153/1/21](https://doi.org/10.3847%2F1538-3881%2F153%2F1%2F21). [S2CID](/source/S2CID_(identifier)) [119511744](https://api.semanticscholar.org/CorpusID:119511744). 21.

1. **[^](#cite_ref-Butler2003_8-0)** Butler, R. Paul; et al. (2003). "Seven New Keck Planets Orbiting G and K Dwarfs". *The Astrophysical Journal*. **582** (1): 455–466. [Bibcode](/source/Bibcode_(identifier)):[2003ApJ...582..455B](https://ui.adsabs.harvard.edu/abs/2003ApJ...582..455B). [CiteSeerX](/source/CiteSeerX_(identifier)) [10.1.1.7.6988](https://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.7.6988). [doi](/source/Doi_(identifier)):[10.1086/344570](https://doi.org/10.1086%2F344570). [S2CID](/source/S2CID_(identifier)) [17608922](https://api.semanticscholar.org/CorpusID:17608922).

1. **[^](#cite_ref-Butler2006_9-0)** Butler, R. P.; et al. (2006). "Catalog of Nearby Exoplanets". *The Astrophysical Journal*. **646** (1): 505–522. [arXiv](/source/ArXiv_(identifier)):[astro-ph/0607493](https://arxiv.org/abs/astro-ph/0607493). [Bibcode](/source/Bibcode_(identifier)):[2006ApJ...646..505B](https://ui.adsabs.harvard.edu/abs/2006ApJ...646..505B). [doi](/source/Doi_(identifier)):[10.1086/504701](https://doi.org/10.1086%2F504701). [hdl](/source/Hdl_(identifier)):[2299/1103](https://hdl.handle.net/2299%2F1103). [S2CID](/source/S2CID_(identifier)) [119067572](https://api.semanticscholar.org/CorpusID:119067572).

1. ^ [***a***](#cite_ref-Feng2022_10-0) [***b***](#cite_ref-Feng2022_10-1) [***c***](#cite_ref-Feng2022_10-2) Feng, Fabo; Butler, R. Paul; et al. (August 2022). ["3D Selection of 167 Substellar Companions to Nearby Stars"](https://doi.org/10.3847%2F1538-4365%2Fac7e57). *[The Astrophysical Journal Supplement Series](/source/The_Astrophysical_Journal_Supplement_Series)*. **262** (21): 21. [arXiv](/source/ArXiv_(identifier)):[2208.12720](https://arxiv.org/abs/2208.12720). [Bibcode](/source/Bibcode_(identifier)):[2022ApJS..262...21F](https://ui.adsabs.harvard.edu/abs/2022ApJS..262...21F). [doi](/source/Doi_(identifier)):[10.3847/1538-4365/ac7e57](https://doi.org/10.3847%2F1538-4365%2Fac7e57). [S2CID](/source/S2CID_(identifier)) [251864022](https://api.semanticscholar.org/CorpusID:251864022).

## External links

v t e Constellation of Hydra List of stars in Hydra Hydra in Chinese astronomy Stars Bayer α (Alphard) β γ (Naga) δ ε (Ashlesha) ζ η θ ι (Ukdah) κ λ μ ν ξ ο π ρ σ (Minchir) τ1 τ2 υ1 (Zhang) υ2 φ1 φ2 φ3 χ1 χ2 ψ ω b1 b3 C F Flamsteed 1 2 3 6 (a) 9 10 12 (D) 14 15 17 19 20 21 23 24 25 26 27 (P) 28 29 33 (A) 34 37 44 47 48 50 51 (k) 52 (l) 54 (m) 55 56 57 58 (Solitaire) 59 60 10 Crt 17 Crt 20 Crt 2 Sex Variable R U V W TW EX HS KU LQ V361 V419 V421 V478 V484 HR 3378 3538 3749 (G) 3750 3858 (I) 3862 3919 3923 (Felis) 4162 4328 4339 (β Ant) 4445 5265 HD 72659 74156 82943 86226 86264 90156 (γ Ant) Other 2MASS 1114−2618 ESO 439-26 Gliese 328 Gliese 357 Gliese 433 Gliese 453 GJ 3634 HAT-P-30 HE 1256−2738 HE 1327−2326 LHS 2065 LHS 3003 LTT 3780 SDSS J090745.0+024507 WASP-25 WASP-36 WASP-84 WASP-166 (Filetdor) WISE 0855−0714 WISEA J1141−3326 Exoplanets Gliese 357 d HD 72659 b HD 74156 b c HD 82943 b c HD 86226 b HD 86264 b TW Hydrae b (unconfirmed) WASP-193b Star clusters Messier 48 Messier 68 NGC 5694 Price-Whelan 1 Nebulae Abell 33 Abell 35 NGC 3242 Southern Owl Nebula Galaxies Messier 83 NGC 2617 2642 2697 2708 2758 2835 2848 2865 2890 2935 2936 2937 2960 2962 2986 2992 3030 3052 3054 3081 3109 3124 3200 3285 3285B 3290 3305 3307 3308 3309 3311 3312 3313 3314 3315 3316 3336 3369 3383 3393 3402 3463 3464 3585 3621 3673 3717 3904 3923 3936 4980 4993 5042 5061 5078 5085 5101 5135 5260 5264 5495 5626 Other 3C 196.1 AM 1316−241 Arp 7 CTQ 327 ESO 510-G13 GAMA202627 GLEAM J0917−0012 Hydra A IC 535 MRC 1138−262 Peekaboo Galaxy PKS 1151−348 RX J0911.4+0551 SDSS J0841+0101 TN J0924−2201 Tololo 1247−232 ZwCl 1693 BCG Galaxy clusters Abell 754 Abell 3411 Abell 3412 Bullet Group Hickson 40 Astronomical events GW170817 Category

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