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 mas[1] |
| Distance | 129 ± 3 ly (40 ± 1 pc) |
| Absolute magnitude (MV) | 4.9 |
| Details | |
| Mass | 1.05 ± 0.01[2] M☉ |
| Radius | 1.12 ± 0.01[2] R☉ |
| Luminosity | 1.219 ± 0.005[2] L☉ |
| Surface gravity (log g) | 4.35 ± 0.01[2] cgs |
| Temperature | 5736 ± 21[2] K |
| Age | 5.5 ± 0.6[2] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | 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 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]
| 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
- ^ a b c d e 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
- ^ 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.
- ^ 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
- "HD 47186". Exoplanets. Archived from the original on 2012-03-18. Retrieved 2008-12-16.
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