# HD 114762 b

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Star in the constellation Coma Berenices

Not to be confused with HD 114762 b's stellar companion, [HD 114762](/source/HD_114762).

HD 114762 b[1] Observation data Epoch J2000 Equinox J2000 Constellation Coma Berenices Right ascension 13h 12m 19.7428s[2] Declination +17° 31′ 01.654″[2] Astrometry Distance 126±2[2] ly (38.6±0.7[2] pc) Orbit Primary HD 114762 Period (P) 83.915±0.003 d[3] Semi-major axis (a) 0.375±0.006 AU[3] Eccentricity (e) 0.566+0.012 −0.011[3] Inclination (i) 6.23+1.97 −1.26[3]° Periastron epoch (T) 2449889.106±0.186[4] Argument of periastron (ω) (secondary) 201.3±1.0[3]° Semi-amplitude (K2) (secondary) 612.48±3.52[4] km/s Details Mass 0.293+0.103 −0.056[5] M☉ Database references SIMBAD data

**HD 114762 b** is a small [red dwarf](/source/Red_dwarf) star[3] in the [constellation](/source/Constellation) of [Coma Berenices](/source/Coma_Berenices).[1][6] It is an optically undetected companion to the [late](/source/Late-type_star) [F-type main-sequence star](/source/F-type_main-sequence_star) [HD 114762](/source/HD_114762). The system is located at a distance of approximately 126 [light-years](/source/Light-year) (38.6 [pc](/source/Parsec)) from the Sun.[7]

The companion was discovered in 1989 by Latham, *et al*.,[8] and confirmed in an October 1991 paper by Cochran, *et al*.[9] Initially, it was thought to be the first discovered exoplanet (although its existence was confirmed after those around [PSR B1257+12](/source/PSR_B1257%2B12)), and was believed to be a [gas giant](/source/Gas_giant).[6][8]

The object orbits the primary star every 83.9 days at an approximate distance of 0.37 [AU](/source/Astronomical_unit),[3] with an [orbital eccentricity](/source/Orbital_eccentricity) of 0.57;[3] for comparison, this orbit is similar to that of [Mercury](/source/Mercury_(planet)) but with almost three times the eccentricity.[3] Based on the radial velocity measurements alone, it was estimated to have a minimum mass of 11.069±0.063 [MJ](/source/Jupiter_mass) (at 90°)[10] and a probable mass of approximately 63.2 [MJ](/source/Jupiter_mass) (at 10°).[11] However, analysis of its astrometric perturbation of its host star in 2019 found it to have an extremely low inclination of only 6.23+1.97 −1.26 degrees, giving it a true mass of 107+20 −27 MJ and putting it well outside of the range of planetary masses (less than 13 [MJ](/source/Jupiter_mass)).[3] Further estimates have revised this up to 0.293 [solar masses](/source/Solar_mass).[5]

HD 114762 b was thought for a time to be the first extrasolar planet ever detected, predating the discoveries of planets orbiting [PSR B1257+12](/source/PSR_B1257%2B12) and [main-sequence](/source/Main-sequence) star [51 Pegasi](/source/51_Pegasi), in 1992 and 1995, respectively.[12][13] However, now that it has been found to not be a planet, the planets found orbiting PSR B1257+12 were indeed the first exoplanets ever found.[3]

At an event celebrating the career of discoverer David Latham and attended by his colleagues and collaborators, the object was informally dubbed "Latham's Planet".[14] However, this name has no official standing with the [International Astronomical Union](/source/International_Astronomical_Union).

## See also

- [51 Pegasi b](/source/51_Pegasi_b)

- [Gamma Cephei Ab](/source/Gamma_Cephei_Ab)

## References

1. ^ [***a***](#cite_ref-Butler2006_1-0) [***b***](#cite_ref-Butler2006_1-1) 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). [S2CID](/source/S2CID_(identifier)) [119067572](https://api.semanticscholar.org/CorpusID:119067572).

1. ^ [***a***](#cite_ref-Gaia2016_2-0) [***b***](#cite_ref-Gaia2016_2-1) [***c***](#cite_ref-Gaia2016_2-2) [***d***](#cite_ref-Gaia2016_2-3) Brown, A. G. A; et al. (2016). ["Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties"](https://www.aanda.org/articles/aa/full_html/2016/11/aa29512-16/aa29512-16.html). *Astronomy and Astrophysics*. **595**. A2. [arXiv](/source/ArXiv_(identifier)):[1609.04172](https://arxiv.org/abs/1609.04172). [Bibcode](/source/Bibcode_(identifier)):[2016A&A...595A...2G](https://ui.adsabs.harvard.edu/abs/2016A&A...595A...2G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201629512](https://doi.org/10.1051%2F0004-6361%2F201629512). [S2CID](/source/S2CID_(identifier)) [1828208](https://api.semanticscholar.org/CorpusID:1828208).[Gaia Data Release 1 catalog entry](http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/337/tgas&recno=1050120)

1. ^ [***a***](#cite_ref-Kiefer2019_3-0) [***b***](#cite_ref-Kiefer2019_3-1) [***c***](#cite_ref-Kiefer2019_3-2) [***d***](#cite_ref-Kiefer2019_3-3) [***e***](#cite_ref-Kiefer2019_3-4) [***f***](#cite_ref-Kiefer2019_3-5) [***g***](#cite_ref-Kiefer2019_3-6) [***h***](#cite_ref-Kiefer2019_3-7) [***i***](#cite_ref-Kiefer2019_3-8) [***j***](#cite_ref-Kiefer2019_3-9) [***k***](#cite_ref-Kiefer2019_3-10) 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-Kane2011_4-0) [***b***](#cite_ref-Kane2011_4-1) 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-:0_5-0) [***b***](#cite_ref-:0_5-1) Winn, Joshua N. (2022-11-01). ["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). [ISSN](/source/ISSN_(identifier)) [0004-6256](https://search.worldcat.org/issn/0004-6256).

1. ^ [***a***](#cite_ref-North2003_6-0) [***b***](#cite_ref-North2003_6-1) North, Gerald (2003). [*Astronomy in Depth*](https://books.google.com/books?id=D3RRG9W8nSYC&pg=PA185). New York: Springer. p. 185. [ISBN](/source/ISBN_(identifier)) [9781852335809](https://en.wikipedia.org/wiki/Special:BookSources/9781852335809).

1. **[^](#cite_ref-simbad_7-0)** ["HD 114762b"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+114762b). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 31 August 2014.

1. ^ [***a***](#cite_ref-Latham1989_8-0) [***b***](#cite_ref-Latham1989_8-1) Latham, David W.; et al. (4 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. **[^](#cite_ref-Cochran1991_9-0)** Cochran, William D.; et al. (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).

1. **[^](#cite_ref-wang_10-0)** Wang, Sharon Xuesong; et al. (2012). "The Discovery of HD 37605c and a Dispositive Null Detection of Transits of HD 37605b". *The Astrophysical Journal*. **761** (1): 46–59. [arXiv](/source/ArXiv_(identifier)):[1210.6985](https://arxiv.org/abs/1210.6985). [Bibcode](/source/Bibcode_(identifier)):[2012ApJ...761...46W](https://ui.adsabs.harvard.edu/abs/2012ApJ...761...46W). [doi](/source/Doi_(identifier)):[10.1088/0004-637X/761/1/46](https://doi.org/10.1088%2F0004-637X%2F761%2F1%2F46). [S2CID](/source/S2CID_(identifier)) [118679173](https://api.semanticscholar.org/CorpusID:118679173).

1. **[^](#cite_ref-Kane2012_11-0)** Kane, Stephen R. & Gelino, Dawn M. (2012). ["Distinguishing between stellar and planetary companions with phase monitoring"](https://doi.org/10.1111%2Fj.1365-2966.2012.21265.x). *Monthly Notices of the Royal Astronomical Society*. **424** (1): 779–788. [arXiv](/source/ArXiv_(identifier)):[1205.5812](https://arxiv.org/abs/1205.5812). [Bibcode](/source/Bibcode_(identifier)):[2012MNRAS.424..779K](https://ui.adsabs.harvard.edu/abs/2012MNRAS.424..779K). [doi](/source/Doi_(identifier)):[10.1111/j.1365-2966.2012.21265.x](https://doi.org/10.1111%2Fj.1365-2966.2012.21265.x). [S2CID](/source/S2CID_(identifier)) [15537565](https://api.semanticscholar.org/CorpusID:15537565).

1. **[^](#cite_ref-Hale1995_12-0)** [Hale, Alan](/source/Alan_Hale_(astronomer)) (1995). ["On the Nature of the Companion to HD 114762"](https://doi.org/10.1086%2F133511). *Publications of the Astronomical Society of the Pacific*. **107** (707). [The University of Chicago Press](/source/The_University_of_Chicago_Press): 22–26. [Bibcode](/source/Bibcode_(identifier)):[1995PASP..107...22H](https://ui.adsabs.harvard.edu/abs/1995PASP..107...22H). [doi](/source/Doi_(identifier)):[10.1086/133511](https://doi.org/10.1086%2F133511). [JSTOR](/source/JSTOR_(identifier)) [40680489](https://www.jstor.org/stable/40680489).

1. **[^](#cite_ref-Marcy1999_13-0)** [Marcy, Geoffrey W.](/source/Geoffrey_Marcy); et al. (1999). "Two New Candidate Planets in Eccentric Orbits". *The Astrophysical Journal*. **520** (1): 239–247. [arXiv](/source/ArXiv_(identifier)):[astro-ph/9904275](https://arxiv.org/abs/astro-ph/9904275). [Bibcode](/source/Bibcode_(identifier)):[1999ApJ...520..239M](https://ui.adsabs.harvard.edu/abs/1999ApJ...520..239M). [doi](/source/Doi_(identifier)):[10.1086/307451](https://doi.org/10.1086%2F307451). [S2CID](/source/S2CID_(identifier)) [16827678](https://api.semanticscholar.org/CorpusID:16827678).

1. **[^](#cite_ref-Johnson2016_14-0)** Johnson, John (2016). [*How do you find an Exoplanet?*](https://books.google.com/books?id=-DNJCgAAQBAJ&pg=PA137). New Jersey: [Princeton University Press](/source/Princeton_University_Press). p. 137. [ISBN](/source/ISBN_(identifier)) [978-0-691-15681-1](https://en.wikipedia.org/wiki/Special:BookSources/978-0-691-15681-1).

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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