HD 106252

HD 106252 is a star with a brown dwarf[8] companion in the constellation Virgo. An apparent visual magnitude of 7.41[2] means this star is too faint to be visible to the naked eye. It is located at a distance of 210 light years from the Sun based on parallax measurements, and is receding with a radial velocity of 15 km/s.[5]

HD 106252
Observation data
Epoch J2000      Equinox J2000
Constellation Virgo
Right ascension 12h 13m 29.510s[1]
Declination +10° 02′ 29.88″[1]
Apparent magnitude (V) 7.41[2]
Characteristics
Spectral type G0V[3]
B−V color index 0.635±0.007[4]
Astrometry
Radial velocity (Rv)15.44±0.11[5] km/s
Proper motion (μ) RA: 22.863 mas/yr[1]
Dec.: −280.009 mas/yr[1]
Parallax (π)15.533 ± 0.0048 mas[1]
Distance209.98 ± 0.06 ly
(64.38 ± 0.02 pc)
Absolute magnitude (MV)4.53[2]
Details
Mass1.05±0.02[6] M☉
Radius1.096[3] R☉
Luminosity1.328±0.030[6] L☉
Surface gravity (log g)4.40±0.15[4] cgs
Temperature5,890±50[4] K
Metallicity [Fe/H]−0.06±0.04[6] dex
Rotation22.8 d[3]
Rotational velocity (v sin i)1.74±0.25[4] km/s
Age3.00+0.8
−0.6[6] Gyr
Other designations
BD+10° 2392, HD 106252, HIP 59610, SAO 99998, LTT 13402, NLTT 30020[7]
Database references
SIMBADdata
Exoplanet Archivedata

The stellar classification of HD 106252 is G0V,[3] matching an ordinary G-type main-sequence star. It has 5%[6] more mass than the Sun and 10%[3] greater in girth. This star is about three[6] billion years old with a low level of magnetic activity[4] and is spinning with a projected rotational velocity of 2 km/s.[4] It is radiating 1.3[6] times the luminosity of the Sun from its photosphere at an effective temperature of 5,890 K.[4]

In 2001, a massive sub-stellar companion was announced orbiting the star by the European Southern Observatory.[9][4] The discovery was confirmed by a different team using the Lick Telescope.[3] Astrometric observations from Hipparcos in 2011 suggested that its true mass is likely around 30.6 MJ, in the brown dwarf range.[8] More accurate astrometry from Gaia in 2021 revealed a smaller true mass of 10.0 MJ.[6]

The HD 106252 planetary system[6]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(years)		 Eccentricity Inclination Radius
b 10.00+0.78
−0.73 MJ		 2.655±0.017 4.202+0.011
−0.010		 0.480±0.010 46.0+4.9
−4.1°		 —

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
  3. Fischer, Debra A.; et al. (2002). "Planetary Companions to HD 136118, HD 50554, and HD 106252". Publications of the Astronomical Society of the Pacific. 114 (795): 529–535. Bibcode:2002PASP..114..529F. doi:10.1086/341677.
  4. Perrier, C.; et al. (2003). "The ELODIE survey for northern extra-solar planets. I. Six new extra-solar planet candidates". Astronomy and Astrophysics. 410 (3): 1039–1049. arXiv:astro-ph/0308281. Bibcode:2003A&A...410.1039P. doi:10.1051/0004-6361:20031340. S2CID 6946291.
  5. Nidever, David L.; Marcy, Geoffrey W.; Butler, R. Paul; Fischer, Debra A.; Vogt, Steven S.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2002). "Radial Velocities for 889 Late-Type Stars". The Astrophysical Journal Supplement Series. 141 (2): 503–522. arXiv:astro-ph/0112477. Bibcode:2002ApJS..141..503N. doi:10.1086/340570. S2CID 51814894.
  6. Li, Yiting; et al. (2021). "Precise Masses and Orbits for Nine Radial-velocity Exoplanets". The Astronomical Journal. 162 (6): 266. arXiv:2109.10422. Bibcode:2021AJ....162..266L. doi:10.3847/1538-3881/ac27ab. S2CID 237592581.
  7. "HD 106252". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-04-12.
  8. Reffert, S.; Quirrenbach, A. (March 2011). "Mass constraints on substellar companion candidates from the re-reduced Hipparcos intermediate astrometric data: nine confirmed planets and two confirmed brown dwarfs". Astronomy & Astrophysics. 527: 22. arXiv:1101.2227. Bibcode:2011A&A...527A.140R. doi:10.1051/0004-6361/201015861. S2CID 54986291. A140.
  9. "Exoplanets: The Hunt Continues!" (Press release). Garching, Germany: European Southern Observatory. April 4, 2001. Retrieved December 27, 2012.
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