HD 47186

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Template:Short description

HD 47186
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Canis Major[1]
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 7.63[1]
Characteristics
Evolutionary stage main sequence
Spectral type G6V[3]
B−V Template:Engvar Script error: No such module "val".[1]
Astrometry
Radial velocity (Rv)4.238±0.0003[4] km/s
Proper motion (μ) RA: 21.582 mas/yr[2]
Dec.: −262.843 mas/yr[2]
Parallax (π)26.7476±0.0217 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)4.64[1]
Details
MassScript error: No such module "val".[5] Template:Solar mass
RadiusScript error: No such module "val".[5] Template:Solar radius
LuminosityScript error: No such module "val".[5] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[5] cgs
TemperatureScript error: No such module "val".[5] K
Metallicity [Fe/H]0.23[6] dex
Rotational velocity (v sin i)1.953[6] km/s
AgeScript error: No such module "val".[5] Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[7]
Database references
SIMBADdata
Exoplanet Archivedata

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HD 47186 is a star with a pair of orbiting exoplanets in the southern constellation of Canis Major. The system is located at a distance of 122 light years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of 4.2 km/s.[4] Although it has an absolute magnitude of 4.64,[1] at the distance of this system the apparent visual magnitude is 7.63;[1] too faint to be seen with the naked eye. It has a high proper motion, traversing the celestial sphere at an angular rate of Script error: No such module "val".·yr−1.[8]

The spectrum of HD 47186 matches a G-type main-sequence star with a stellar classification of G6V.[3] It is an estimated 5.5[5] billion years old and is spinning with a projected rotational velocity of 2 km/s.[6] The star has 5% greater mass and a 12% larger girth compared to the Sun.[5] The abundance of iron, a measure of the star's metallicity, is 1.7 times more than the Sun, making it metal-rich.[6] HD 47186 is radiating 1.2 times the luminosity of the Sun from its photosphere at an effective temperature of 5,736 K.[5]

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.[9]

Template:OrbitboxPlanet begin Template:OrbitboxPlanet Template:OrbitboxPlanet

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See also

References

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  1. ↑ a b c d e f Template:Cite XHIP
  2. ↑ a b c d Template:Cite Gaia DR3
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  5. ↑ a b c d e f g h i Script error: No such module "Citation/CS1".
  6. ↑ a b c d Script error: No such module "Citation/CS1".
  7. ↑ Template:Cite simbad
  8. ↑ Script error: No such module "citation/CS1".
  9. ↑ Script error: No such module "Citation/CS1".

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Further reading

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Template:Sky Template:HD 47186 Template:Stars of Canis Major

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