# HD 114762

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Triple star system in the constellation Coma Berenices

HD 114762 Observation data Epoch J2000.0 Equinox J2000.0 Constellation Coma Berenices Right ascension 13h 12m 19.74107s[1] Declination +17° 31′ 01.6303″[1] Apparent magnitude (V) 7.30[2] + 15.00[3] Characteristics A Evolutionary stage subgiant[4] Spectral type F9[4] B−V color index 0.525[2] B Evolutionary stage Main sequence[4] Spectral type sdM9[5] J−K color index 0.70 Astrometry Radial velocity (Rv) 49.63±0.18[1] km/s Proper motion (μ) RA: −580.999 mas/yr[1] Dec.: 1.062 mas/yr[1] Parallax (π) 26.1979±0.1082 mas[1] Distance 124.5 ± 0.5 ly (38.2 ± 0.2 pc) Orbit[6] Name HD 114762 Ab Period (P) 83.91712±0.00064 d Semi-major axis (a) 0.361±0.012 AU[7] Eccentricity (e) 0.3442±0.0012 Inclination (i) 2.8±0.6° Periastron epoch (T) 2449969.202±0.048 Argument of periastron (ω) (primary) 201.3±1.0[7]° Semi-amplitude (K1) (primary) 0.6201±0.00085 km/s Details HD 114762 A Mass 1.046±0.040[6] M☉ Radius 1.24±0.05[2] R☉ Surface gravity (log g) 4.18±0.03[4] cgs Temperature 5869±13[4] K Metallicity [Fe/H] −0.72+0.05 −0.07[4] dex Age 12±4[4] Gyr HD 114762 Ab Mass 0.293+0.103 −0.056[6] M☉ HD 114762 B Mass 0.0879[5] M☉ Radius 0.100[5] R☉ Luminosity 0.00043[5] L☉ Surface gravity (log g) 5.381[5] cgs Temperature 2,645[5] K Metallicity [Fe/H] −0.71[5] dex Age ~10[5] Gyr Other designations BD+18 2700, HD 114762, HIP 64426, SAO 100458, 2MASS J13121982+1731016[8] Database references SIMBAD data Exoplanet Archive data ARICNS data

**HD 114762** is a [triple star](/source/Triple_star) system[3][4] approximately 125 [light-years](/source/Light-year) (38.2 [pc](/source/Parsec)) away in the [constellation](/source/Constellation) [Coma Berenices](/source/Coma_Berenices). It consists of a yellow-white [F-type main-sequence star](/source/F-type_main-sequence_star) (HD 114762 A) and two [red dwarf](/source/Red_dwarf) companions (HD 114762 Ab & HD 114762 B) approximately 0.36 & 130 [AU](/source/Astronomical_unit) distant.[3][4] Both are low-metal [subdwarfs](/source/Subdwarf). Planets around such metal-poor stars are rare (three known cases are [HD 22781](/source/HD_22781), [HD 111232](/source/HD_111232), and [HD 181720](/source/HD_181720)).[9] A [telescope](/source/Telescope) or strong [binoculars](/source/Binoculars) are needed to view the primary. HD 114762 had been used by scientists as a "standard star", one whose [radial velocity](/source/Radial_velocity) is well established, but with the discovery of the spectroscopic companion [HD 114762 Ab](/source/HD_114762_b) its usefulness as a standard has been called into question.[10]

The smaller red dwarf companion (HD 114762 B) is classified as an [ultra-cool dwarf](/source/Ultra-cool_dwarf), with a spectral type around M9.[5] With a [visual magnitude](/source/Apparent_magnitude) of 15 and separated from the primary by only three [arcseconds](/source/Arcsecond), it can only be seen with a powerful telescope.[3] It is estimated to be around 10 billion years old, although the properties of such low-mass stars are very similar across a wide range of ages. It is calculated have only 8% of the [mass of the Sun](/source/Mass_of_the_Sun), a tenth of [its radius](/source/Solar_radius), and with a temperature of about 2,645 [K](/source/Kelvin) it produces less than a thousandth of [its luminosity](/source/Solar_luminosity).[5]

## Spectroscopic companion

Main article: [HD 114762 b](/source/HD_114762_b)

In 1989, a companion object, HD 114762 Ab, was found orbiting HD 114762 A by Latham, *et al*., using [Doppler spectroscopy](/source/Doppler_spectroscopy),[11] but its existence was not confirmed until 1991 by Cochran, *et al*.[12] Its orbital distance and revolution is similar to that of [Mercury](/source/Mercury_(planet)), though it has twice the [eccentricity](/source/Orbital_eccentricity).[12] It has a [minimum mass](/source/Minimum_mass) of 10.69 [MJ](/source/Jupiter_mass), and thus was originally thought to be a massive [exoplanet](/source/Exoplanet); however, in 2019, its [inclination](/source/Orbital_inclination) was determined by [Gaia](/source/Gaia_(spacecraft)) [astrometry](/source/Astrometry), giving it a true mass of 141 [MJ](/source/Jupiter_mass). This makes it a [red dwarf](/source/Red_dwarf) star, or a massive [brown dwarf](/source/Brown_dwarf).[4] A 2020 study provided further confirmation of this, and revised the mass upwards to 147 MJ,[7] and in 2022 this mass was revised upwards still further, to 0.293 [M☉](/source/Solar_mass), based on [Gaia DR3](/source/Gaia_DR3) data and a similar upwards revision to the mass of the primary star.[6]

## References

1. ^ [***a***](#cite_ref-GaiaDR3_1-0) [***b***](#cite_ref-GaiaDR3_1-1) [***c***](#cite_ref-GaiaDR3_1-2) [***d***](#cite_ref-GaiaDR3_1-3) [***e***](#cite_ref-GaiaDR3_1-4) 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%3D3937211745905473024%26-go+%25%23Sesame%23%25%26) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-Kane2011_2-0) [***b***](#cite_ref-Kane2011_2-1) [***c***](#cite_ref-Kane2011_2-2) Kane, Stephen R.; et al. (2011). "Revised Orbit and Transit Exclusion for HD 114762b". *The Astrophysical Journal Letters*. **735** (2). L41. [arXiv](/source/ArXiv_(identifier)):[1106.1434](https://arxiv.org/abs/1106.1434). [Bibcode](/source/Bibcode_(identifier)):[2011ApJ...735L..41K](https://ui.adsabs.harvard.edu/abs/2011ApJ...735L..41K). [doi](/source/Doi_(identifier)):[10.1088/2041-8205/735/2/L41](https://doi.org/10.1088%2F2041-8205%2F735%2F2%2FL41). [S2CID](/source/S2CID_(identifier)) [118409104](https://api.semanticscholar.org/CorpusID:118409104).

1. ^ [***a***](#cite_ref-Patience2002_3-0) [***b***](#cite_ref-Patience2002_3-1) [***c***](#cite_ref-Patience2002_3-2) [***d***](#cite_ref-Patience2002_3-3) Patience, J.; White, R. J.; Ghez, A. M.; McCabe, C.; McLean, I. S.; et al. (December 2002). "Stellar Companions to Stars with Planets". *[The Astrophysical Journal](/source/The_Astrophysical_Journal)*. **581** (1): 654–665. [arXiv](/source/ArXiv_(identifier)):[astro-ph/0207538](https://arxiv.org/abs/astro-ph/0207538). [Bibcode](/source/Bibcode_(identifier)):[2002ApJ...581..654P](https://ui.adsabs.harvard.edu/abs/2002ApJ...581..654P). [doi](/source/Doi_(identifier)):[10.1086/342982](https://doi.org/10.1086%2F342982). [S2CID](/source/S2CID_(identifier)) [119519887](https://api.semanticscholar.org/CorpusID:119519887).

1. ^ [***a***](#cite_ref-Kiefer2019_4-0) [***b***](#cite_ref-Kiefer2019_4-1) [***c***](#cite_ref-Kiefer2019_4-2) [***d***](#cite_ref-Kiefer2019_4-3) [***e***](#cite_ref-Kiefer2019_4-4) [***f***](#cite_ref-Kiefer2019_4-5) [***g***](#cite_ref-Kiefer2019_4-6) [***h***](#cite_ref-Kiefer2019_4-7) [***i***](#cite_ref-Kiefer2019_4-8) [***j***](#cite_ref-Kiefer2019_4-9) Kiefer, Flavien (17 October 2019). "Determining the mass of the planetary candidate HD 114762 b using Gaia". *Astronomy & Astrophysics*. **632**: L9. [arXiv](/source/ArXiv_(identifier)):[1910.07835](https://arxiv.org/abs/1910.07835). [Bibcode](/source/Bibcode_(identifier)):[2019A&A...632L...9K](https://ui.adsabs.harvard.edu/abs/2019A&A...632L...9K). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201936942](https://doi.org/10.1051%2F0004-6361%2F201936942). [S2CID](/source/S2CID_(identifier)) [204743831](https://api.semanticscholar.org/CorpusID:204743831).

1. ^ [***a***](#cite_ref-bowler2099_5-0) [***b***](#cite_ref-bowler2099_5-1) [***c***](#cite_ref-bowler2099_5-2) [***d***](#cite_ref-bowler2099_5-3) [***e***](#cite_ref-bowler2099_5-4) [***f***](#cite_ref-bowler2099_5-5) [***g***](#cite_ref-bowler2099_5-6) [***h***](#cite_ref-bowler2099_5-7) [***i***](#cite_ref-bowler2099_5-8) [***j***](#cite_ref-bowler2099_5-9) Bowler, Brendan P.; Liu, Michael C.; Cushing, Michael C. (2009). "The Benchmark Ultracool Subdwarf HD 114762B: A Test of Low-metallicity Atmospheric and Evolutionary Models". *The Astrophysical Journal*. **706** (2): 1114. [arXiv](/source/ArXiv_(identifier)):[0910.1604](https://arxiv.org/abs/0910.1604). [Bibcode](/source/Bibcode_(identifier)):[2009ApJ...706.1114B](https://ui.adsabs.harvard.edu/abs/2009ApJ...706.1114B). [doi](/source/Doi_(identifier)):[10.1088/0004-637X/706/2/1114](https://doi.org/10.1088%2F0004-637X%2F706%2F2%2F1114). [S2CID](/source/S2CID_(identifier)) [119112746](https://api.semanticscholar.org/CorpusID:119112746).

1. ^ [***a***](#cite_ref-Winn2022_6-0) [***b***](#cite_ref-Winn2022_6-1) [***c***](#cite_ref-Winn2022_6-2) [***d***](#cite_ref-Winn2022_6-3) Winn, Joshua N. (September 2022). ["Joint Constraints on Exoplanetary Orbits from Gaia DR3 and Doppler Data"](https://doi.org/10.3847%2F1538-3881%2Fac9126). *The Astronomical Journal*. **164** (5): 196. [arXiv](/source/ArXiv_(identifier)):[2209.05516](https://arxiv.org/abs/2209.05516). [Bibcode](/source/Bibcode_(identifier)):[2022AJ....164..196W](https://ui.adsabs.harvard.edu/abs/2022AJ....164..196W). [doi](/source/Doi_(identifier)):[10.3847/1538-3881/ac9126](https://doi.org/10.3847%2F1538-3881%2Fac9126). [S2CID](/source/S2CID_(identifier)) [252211643](https://api.semanticscholar.org/CorpusID:252211643).

1. ^ [***a***](#cite_ref-Kiefer2020_7-0) [***b***](#cite_ref-Kiefer2020_7-1) [***c***](#cite_ref-Kiefer2020_7-2) Kiefer, F.; et al. (January 2021). ["Determining the true mass of radial-velocity exoplanets with Gaia. Nine planet candidates in the brown dwarf or stellar regime and 27 confirmed planets"](https://doi.org/10.1051%2F0004-6361%2F202039168). *Astronomy & Astrophysics*. **645** A7. [arXiv](/source/ArXiv_(identifier)):[2009.14164](https://arxiv.org/abs/2009.14164). [Bibcode](/source/Bibcode_(identifier)):[2021A&A...645A...7K](https://ui.adsabs.harvard.edu/abs/2021A&A...645A...7K). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202039168](https://doi.org/10.1051%2F0004-6361%2F202039168). [S2CID](/source/S2CID_(identifier)) [221995447](https://api.semanticscholar.org/CorpusID:221995447).

1. **[^](#cite_ref-Simbad_8-0)** ["HD 114762"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+114762). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2019-01-16.

1. **[^](#cite_ref-9)** Adibekyan, Vardan (2019), "Heavy Metal Rules. I. Exoplanet Incidence and Metallicity", *Geosciences*, **9** (3): 105, [arXiv](/source/ArXiv_(identifier)):[1902.04493](https://arxiv.org/abs/1902.04493), [Bibcode](/source/Bibcode_(identifier)):[2019Geosc...9..105A](https://ui.adsabs.harvard.edu/abs/2019Geosc...9..105A), [doi](/source/Doi_(identifier)):[10.3390/geosciences9030105](https://doi.org/10.3390%2Fgeosciences9030105), [S2CID](/source/S2CID_(identifier)) [119089419](https://api.semanticscholar.org/CorpusID:119089419)

1. **[^](#cite_ref-latimes19880804_10-0)** Maugh II, Thomas H. (4 August 1988). ["Other Planets, Other Suns: Astronomers Say Star's Wobble Tells a Story"](https://www.latimes.com/archives/la-xpm-1988-08-04-mn-10212-story.html). *[Los Angeles Times](/source/Los_Angeles_Times)*. Retrieved 7 September 2014.

1. **[^](#cite_ref-Latham1989_11-0)** Latham, David W.; Mazeh, Tsevi; Stefanik, Robert P.; Mayor, Michel; Burki, Gilbert (May 1989). "The unseen companion of HD114762 - A probable brown dwarf". *[Nature](/source/Nature_(journal))*. **339** (6219): 38–40. [Bibcode](/source/Bibcode_(identifier)):[1989Natur.339...38L](https://ui.adsabs.harvard.edu/abs/1989Natur.339...38L). [doi](/source/Doi_(identifier)):[10.1038/339038a0](https://doi.org/10.1038%2F339038a0). [S2CID](/source/S2CID_(identifier)) [4324036](https://api.semanticscholar.org/CorpusID:4324036).

1. ^ [***a***](#cite_ref-Cochran1991_12-0) [***b***](#cite_ref-Cochran1991_12-1) Cochran, William D.; Hatzes, Artie P.; Hancock, Terry J. (10 October 1991). ["Constraints on the Companion Object to HD 114762"](https://doi.org/10.1086%2F186167). *[The Astrophysical Journal](/source/The_Astrophysical_Journal)*. **380**: L35–L38. [Bibcode](/source/Bibcode_(identifier)):[1991ApJ...380L..35C](https://ui.adsabs.harvard.edu/abs/1991ApJ...380L..35C). [doi](/source/Doi_(identifier)):[10.1086/186167](https://doi.org/10.1086%2F186167).

v t e Constellation of Coma Berenices List of stars in Coma Berenices Coma Berenices in Chinese astronomy Stars Bayer α (Diadem) β γ Flamsteed 7 11 12 13 14 16 17 21 23 (Phyllon Kissinou) 24 31 35 36 37 41 Variable FK GP IN LW HR 4668 HD 107146 108863 108874 110067 114762 b 115404 116029 Other 2MASS J12195156+3128497 KELT-6 WASP-56 WISE 1217+1626 Exoplanets HD 108874 b c KELT-6b Star clusters Coma Star Cluster Messier 53 NGC 4147 NGC 5053 Nebulae LoTr 5 Galaxies Messier 64 (Black Eye Galaxy) 85 88 91 98 99 100 NGC 4014 4015 4017 4053 4056 4060 4061 4065 4066 4070 4072 4074 4076 4084 4086 4089 4090 4091 4092 4093 4095 4098 4136 4146 4150 4162 4185 4189 4203 4211 4212 4213 4222 4237 4245 4253 4262 4274 4278 4293 4298 4302 4308 4310 4312 4314 4323 4328 4340 4359 4375 4383 4393 4394 4414 4419 4448 4450 4455 4459 4468 4473 4474 4475 4477 4479 4489 4494 4495 4498 4502 4506 4515 4516 4523 4525 4540 4555 4556 4558 4559 4561 4565 4571 4585 4595 4611 4614 4615 4633 4634 4651 4659 4670 4673 4676 (Mice Galaxies) 4689 4692 4710 4712 4725 4747 4839 4848 4860 4869 4871 4872 4873 4874 4875 4876 4881 4883 4886 4889 4892 4895 4907 4911 4919 4921 4944 5000 5004 5012 5032 5056 5172 Other 3C 275.1 3C 287 Arp 60 Coma Berenices Dragonfly 44 IC 755 (NGC 4019) IC 831 IC 860 IC 3505 IC 3528 IC 4040 IC 4051 IOK-1 IRAS F12032+1707 LEDA 83677 M85-HCC1 Malin 1 PGC 44691 PKS 1155+251 PKS 1222+216 VIRGOHI21 ZwCl 1305.4+2941 BCG Galaxy clusters Abell 1413 Coma I Coma Cluster Coma Supercluster M94 Group NGC 4065 Group NGC 4631 Group Astronomical events GRB 050509B iPTF14atg SN 1940B SN 1979C SN 2005ap SN 2006X SN 2020oi Category

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Adapted from the Wikipedia article [HD 114762](https://en.wikipedia.org/wiki/HD_114762) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/HD_114762?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.