HD 169830
HD 169830 is a yellow-white dwarf star (spectral type F9V) in the constellation of Sagittarius, 118.46 light years from the Solar System. It is known to be orbited by two large Jupiter-like planets.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 18h 27m 49.48s [1] |
| Declination | –29° 49′ 00.7″ [1] |
| Apparent magnitude (V) | +5.911 |
| Characteristics | |
| Spectral type | F7V |
| B−V color index | 0.475 |
| Variable type | “None” |
| Astrometry | |
| Radial velocity (Rv) | –17.4 km/s |
| Proper motion (μ) | RA: –1.39 ± 0.55 [1] mas/yr Dec.: 16.11 ± 0.32 [1] mas/yr |
| Parallax (π) | 27.32 ± 0.41[1] mas |
| Distance | 119 ± 2 ly (36.6 ± 0.5 pc) |
| Absolute magnitude (MV) | +3.110 |
| Details | |
| Mass | 1.4 M☉ |
| Radius | 1.84 R☉ |
| Luminosity | 4.66 L☉ |
| Surface gravity (log g) | 4.17 cgs |
| Temperature | 6266 K |
| Metallicity | 0.21 ± 0.05 |
| Rotation | 9.5 days |
| Age | 4.95×109 years |
| Other designations | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
Star
This star is classified as spectral type F7V, meaning the color of the photosphere of this star is yellow-white. It takes 9.5 days for the star to rotate once around its axis. This star is 40% more massive and 84% larger than our Sun. Combining the mass and radius makes the surface gravity only 41% that of our Sun.
Planetary system
On April 15, 2000, the Geneva Extrasolar Planet Search Team announced the discovery of a 3 MJ planet in a 226-day orbit.[2][3] Three years later on June 30, 2003, the same two teams using the same method discovered a 3.5 MJ second planet orbiting about halfway between the distances of Mars and Jupiter (or in the middle of the asteroid belt) in the solar system from the star.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >2.88 MJ | 0.81 | 225.62 ± 0.22 | 0.31 ± 0.01 | — | — |
| c | >4.04 MJ | 3.60 | 2102 ± 264 | 0.33 ± 0.02 | — | — |
See also
- HD 69830
- List of extrasolar planets
References
- van Leeuwen, F. (2007). "HIP 90485". Hipparcos, the New Reduction. Retrieved 2009-12-12.
- "Exoplanets Galore!" (Press release). Garching, Germany: European Southern Observatory. April 15, 2000. Retrieved December 30, 2012.
- Naef, D.; et al. (2001). "The CORALIE survey for southern extrasolar planets V. 3 new extrasolar planets". Astronomy and Astrophysics. 375 (1): 205–218. arXiv:astro-ph/0106255. Bibcode:2001A&A...375..205N. doi:10.1051/0004-6361:20010841.
- Mayor, M.; et al. (2004). "The CORALIE survey for southern extra-solar planets XII. Orbital solutions for 16 extra-solar planets discovered with CORALIE". Astronomy and Astrophysics. 415 (1): 391–402. arXiv:astro-ph/0310316. Bibcode:2004A&A...415..391M. doi:10.1051/0004-6361:20034250.
- Raghavan; Henry, Todd J.; Mason, Brian D.; Subasavage, John P.; Jao, Wei‐Chun; Beaulieu, Thom D.; Hambly, Nigel C. (2006). "Two Suns in The Sky: Stellar Multiplicity in Exoplanet Systems". The Astrophysical Journal. 646 (1): 523–542. arXiv:astro-ph/0603836. Bibcode:2006ApJ...646..523R. doi:10.1086/504823.
External links
- "Notes for star HD 169830". The Extrasolar Planets Encyclopaedia. Retrieved 2006-04-14.
- Extrasolar Planet Interactions by Rory Barnes & Richard Greenberg, Lunar and Planetary Lab, University of Arizona