HD 47186

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
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

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[edit]

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[edit]

References[edit]

External links[edit]

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