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 08.788s[1]
Declination −27° 37′ 20.27″[1]
Apparent magnitude (V) 7.8
Characteristics
Spectral type G6V
B−V color index 1.0
Variable type none
Astrometry
Radial velocity (Rv)3.8 ± 0.2 km/s
Proper motion (μ) RA: 21.32 ± 0.40[1] mas/yr
Dec.: −263.01 ± 0.60[1] mas/yr
Parallax (π)25.26 ± 0.65[1] mas
Distance129 ± 3 ly
(40 ± 1 pc)
Absolute magnitude (MV)4.9
Details
Mass1.05 ± 0.01[2] M☉
Radius1.12 ± 0.01[2] R☉
Luminosity1.219 ± 0.005[2] L☉
Surface gravity (log g)4.35 ± 0.01[2] cgs
Temperature5736 ± 21[2] K
Age5.5 ± 0.6[2] Gyr
Other designations
CD−27° 3124, HIP 31540, LTT 2597, NLTT 16742, SAO 172008
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

Planetary system

Announced in June 2008, two extrasolar planets were discovered to be 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.[3]

The HD 47186 planetary system[3]
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. van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. 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.
  3. Bouchy, F.; 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): 527–531. arXiv:0812.1608. Bibcode:2009A&A...496..527B. doi:10.1051/0004-6361:200810669.


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