HD 114762

HD 114762 is a binary star[3] system approximately 126 light-years (38.6 pc) away in the constellation Coma Berenices. It consists of a yellow-white F-type main-sequence star (HD 114762) and a red or brown dwarf companion (HD 114762 B) approximately 130 AU distant.[3] Both are low-metal subdwarfs. A telescope or strong binoculars are needed to view the primary. HD 114762 had been used by scientists as a "standard star", one whose radial velocity is well established, but with the discovery of exoplanet HD 114762 b its usefulness as a standard has been called into question.[4]

HD 114762
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Coma Berenices
Right ascension  13h 12m 19.7428s[1]
Declination +17° 31′ 01.654″[1]
Apparent magnitude (V) 7.30
Characteristics
A
Evolutionary stage Main sequence
Spectral type F9V
U−B color index -0.05
B−V color index 0.54
V−R color index 0.29
R−I color index 0.20
J−H color index 0.25
J−K color index 0.33
B
Evolutionary stage Main sequence
Spectral type M6?V
J−K color index 0.70
Astrometry
Radial velocity (Rv)51.03±0.14 km/s
Proper motion (μ) RA: −582.611±0.041[1] mas/yr
Dec.: −0.520±0.039[1] mas/yr
Parallax (π)25.88 ± 0.46[1] mas
Distance126 ± 2 ly
(38.6 ± 0.7 pc)
Details
Mass0.84 M☉
Radius1.24±0.1 R☉
Temperature5934.0±80.0 K
Metallicity [Fe/H]−0.71±0.08 dex
Age11.8±3.9 Gyr
Other designations
BD+18 2700, HIP 64426, SAO 100458, 2MASS J13121982+1731016[2]
Database references
SIMBADdata
Exoplanet Archivedata
ARICNSdata
Extrasolar Planets
Encyclopaedia		data

Planetary system

In 1989, a substellar object, HD 114762 b, was found orbiting HD 114762 by Latham, et al., using Doppler spectroscopy,[5] but its existence was not confirmed until 1991 by Cochran, et al.[6] By 2012, its status as an exoplanet was confirmed.[7][2] It has a mass of at least 11 MJ, though this will be refined as its inclination is determined. Its orbital distance and revolution is similar to that of Mercury, though it has twice the eccentricity.[6]

The HD 114762 planetary system[8]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b ≥11.069±0.063[9] MJ 0.353±0.001 83.9151±0.0030 0.3354±0.0048 — —
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References
  1. Brown, A. G. A.; et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics. 595. A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512. Gaia Data Release 1 catalog entry.
  2. "HD 114762". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-01-16.
  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. 581 (1): 654–665. arXiv:astro-ph/0207538. Bibcode:2002ApJ...581..654P. doi:10.1086/342982.
  4. Maugh II, Thomas H. (4 August 1988). "Other Planets, Other Suns: Astronomers Say Star's Wobble Tells a Story". Los Angeles Times. Retrieved 7 September 2014.
  5. Latham, David W.; Mazeh, Tsevi; Stefanik, Robert P.; Mayor, Michel; Burki, Gilbert (May 1989). "The unseen companion of HD114762 - A probable brown dwarf". Nature. 339 (6219): 38–40. Bibcode:1989Natur.339...38L. doi:10.1038/339038a0.
  6. Cochran, William D.; Hatzes, Artie P.; Hancock, Terry J. (10 October 1991). "Constraints on the Companion Object to HD 114762". The Astrophysical Journal. 380: L35–L38. Bibcode:1991ApJ...380L..35C. doi:10.1086/186167.
  7. Kane, Stephen R.; Gelino, Dawn M. (2012). "Distinguishing between stellar and planetary companions with phase monitoring". Monthly Notices of the Royal Astronomical Society. 424 (1): 779–788. arXiv:1205.5812. Bibcode:2012MNRAS.424..779K. doi:10.1111/j.1365-2966.2012.21265.x.
  8. Kane, Stephen R.; et al. (2011). "Revised Orbit and Transit Exclusion for HD 114762b". The Astrophysical Journal Letters. 735 (2). L41. arXiv:1106.1434. Bibcode:2011ApJ...735L..41K. doi:10.1088/2041-8205/735/2/L41.
  9. Wang, Xuesong Sharon; Wright, Jason T.; Cochran, William; Kane, Stephen R.; Henry, Gregory W.; et al. (December 2012). "The Discovery of HD 37605c and a Dispositive Null Detection of Transits of HD 37605b". The Astrophysical Journal. 761 (1). 46. arXiv:1210.6985. Bibcode:2012ApJ...761...46W. doi:10.1088/0004-637X/761/1/46.

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