HD 47186

HD 47186 is a star located approximately 129 light-years away in the constellation of Canis Major. It is a G6V star with the characteristics very similar to the Sun, but it is 1.7 times more metal-rich. In 2008, two extrasolar planets were discovered orbiting the star.

HD 47186
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Canis Major
Right ascension 06h 36m 08.78792s[1]
Declination −27° 37′ 20.2669″[1]
Apparent magnitude (V) 7.63[2]
Characteristics
Spectral type G6V[3]
B−V color index 0.714±0.002[2]
Astrometry
Radial velocity (Rv)4.26±0.16[1] km/s
Proper motion (μ) RA: 21.586[1] mas/yr
Dec.: −262.948[1] mas/yr
Parallax (π)26.6680 ± 0.0327 mas[1]
Distance122.3 ± 0.1 ly
(37.50 ± 0.05 pc)
Absolute magnitude (MV)4.64[2]
Details
Mass1.05±0.01[4] M☉
Radius1.12±0.01[4] R☉
Luminosity1.219±0.005[4] L☉
Surface gravity (log g)4.35±0.01[4] cgs
Temperature5,736±21[4] K
Metallicity [Fe/H]0.23[5] dex
Rotational velocity (v sin i)1.953[5] km/s
Age5.5±0.6[4] Gyr
Other designations
CD−27° 3124, HD 47186, HIP 31540, SAO 172008, LTT 2597, NLTT 16742[6]
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

Planetary system

Announced in June 2008, two extrasolar planets were discovered orbiting the star. Both planets are less massive than Jupiter. The inner planet HD 47186 b orbits close to the star and is termed a “hot Neptune”. The outer planet HD 47186 c orbits in a similar distance from the star as the asteroid Vesta, at around 2.4 AU. The inner planet orbits in a circular path while the outer planet orbits in an eccentric path.[7]

The HD 47186 planetary system[7]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b ≥0.07167 MJ 0.050 4.0845 ± 0.0002 0.038 ± 0.020 — —
c ≥0.35061 MJ 2.395 1353.6 ± 57.1 0.249 ± 0.073 — —

See also

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. Gray, R. O.; et al. (July 2006). "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal. 132 (1): 161–170. arXiv:astro-ph/0603770. Bibcode:2006AJ....132..161G. doi:10.1086/504637. S2CID 119476992.
  4. Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. arXiv:1411.4302. Bibcode:2015A&A...575A..18B. doi:10.1051/0004-6361/201424951. S2CID 54555839.
  5. Costa Silva, A. R.; et al. (February 2020). "Chemical abundances of 1111 FGK stars from the HARPS-GTO planet search sample. III. Sulfur". Astronomy & Astrophysics. 634: 10. arXiv:1912.08659. Bibcode:2020A&A...634A.136C. doi:10.1051/0004-6361/201936523. S2CID 209405391. A136.
  6. "HD 47186". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-10-23.
  7. Bouchy, François; et al. (2009). "The HARPS Search for Southern Extra-solar Planets. XVII. Super-Earth and Neptune-mass Planets in Multiple Planet Systems HD 47186 and HD 181433". Astronomy and Astrophysics. 496 (2): 527–31. arXiv:0812.1608. Bibcode:2009A&A...496..527B. doi:10.1051/0004-6361:200810669. S2CID 117778593.


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