HD 47186
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| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Canis Major |
| Right ascension | 06h 36m 08.79s [1] |
| Declination | -27° 37′ 20.3″ [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 |
| Distance | 129 ± 3 ly (40 ± 1 pc) |
| Absolute magnitude (MV) | 4.9 |
| Details | |
| Mass | 0.99 M☉ |
| Temperature | 5675 ± 21 K |
| Metallicity | 170 ± 5% Sun |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| 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.
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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.[2]
| 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]
- ^ a b c d e van Leeuwen, F. (2007). "HIP 31540". Hipparcos, the New Reduction. Retrieved 2010-03-09.
- ^ a b 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.
External links[edit]
- "HD 47186". Exoplanets.
Coordinates: 
06h 36m 08.7880s, −27° 37′ 20.268″
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