HD 47186

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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[1] mas
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

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.

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. ^ a b c d e f 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. ^ a b c 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. ^ a b c d e f 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. ^ a b 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. A136.
  6. ^ "HD 47186". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-10-23.
  7. ^ a b 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.

External links[]

Coordinates: Sky map 06h 36m 08.7880s, −27° 37′ 20.268″


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