HD 169830
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| Observation data Epoch 2000 |
|
|---|---|
| Constellation (pronunciation) |
Sagittarius |
| Right ascension | 18h 27m 49.4838s |
| Declination | -29° 49' 00.715" |
| Apparent magnitude (V) | 5.911 |
| Distance | 118.46 ly (36.32 pc) |
| Spectral type | F9V |
| Other designations | |
|
HR 6907,HIP 90485
|
|
HD 169830 is a yellow-white dwarf star (spectral type F9V) in the constellation of Sagittarius, 118.46 light years from our solar system. It is known to be orbited by two large planets.
Contents |
[edit] HD 169830 b
| Orbital elements | ||
|---|---|---|
| Semi-major axis a: | 0.81 AU | |
| Eccentricity e: | 0.31 ± 0.01 | |
| Orbital period P: | 225.62 ± 0.22 d | |
| Inclination i: | ?° | |
| Angular distance θ: | 22.302 mas | |
| Longitude of periastron ω: |
148 ± 2° | |
| Time of periastron τ: | 2,451,923 ± 1 JD | |
| Semi-amplitude K: | 80.7 ± 0.9 m/s | |
| Physical characteristics | ||
| Mass: | >2.88 MJ | |
| Radius: | 1.3 RJ | |
| Density: | 1738 kg/m³ | |
| Gravity: | 4.02 g | |
| Temperature: | 418 K | |
| Discovery | ||
| Discovery date: | 2000 | |
| Discovery site: | ||
| Detection method(s): | Radial velocity | |
| Discoverer(s): | Mayor, Udry et al. | |
| Other catalogue | ||
HD 169830 b is an extrasolar planet three times the mass of Jupiter. It orbits close to the star, and the temperature of its cloud tops is undoubtedly very high, as a result. Due to its enormous mass, it is most likely a gas giant planet, akin to Jupiter and Saturn in our own solar system.
[edit] HD 169830 c
| Orbital elements | ||
|---|---|---|
| Semi-major axis a: | 2.55 AU | |
| Eccentricity e: | 0.33 ± 0.02 | |
| Orbital period P: | 1487 ± 264 d | |
| Inclination i: | ?° | |
| Angular distance θ: | 99.119 mas | |
| Longitude of periastron ω: |
252 ± 8° | |
| Time of periastron τ: | 2,452,516 ± 25 JD | |
| Semi-amplitude K: | 54.3 ± 3.6 m/s | |
| Physical characteristics | ||
| Mass: | >4.04 MJ | |
| Radius: | 1.1 RJ | |
| Density: | 4025 kg/m³ | |
| Gravity: | 7.87 g | |
| Temperature: | 236 K | |
| Discovery | ||
| Discovery date: | 2003 | |
| Discovery site: | ||
| Detection method(s): | Radial velocity | |
| Discoverer(s): | Mayor, Udry et al. | |
| Other catalogue | ||
HD 169830 c is an extrasolar planet, most likely a gas giant, four times as massive as Jupiter. It is likely to be smaller in radius but slightly larger than Jupiter. Although its appearance is unknown, speculation suggests that the planet is white in appearance, due to water clouds similar to those in our own atmosphere. Its orbit is nearly circular, with a period (year) of 1487 days. The planet orbits in the middle of the star's habitabal zone; therefore, if any moons orbit the planet, they could harbor life.
[edit] See also
[edit] References
- Naef et al. (2001). "The CORALIE survey for southern extrasolar planets V. 3 new extrasolar planets". Astronomy and Astrophysics 375: 205–218.
- Mayor et al. (2004). "The CORALIE survey for southern extra-solar planets XII. Orbital solutions for 16 extra-solar planets discovered with CORALIE" (abstract). Astronomy and Astrophysics 415: 391–402. doi:.
- Raghavan et al. (2006). "Two Suns in The Sky: Stellar Multiplicity in Exoplanet Systems". The Astrophysical Journal 646: 523–542. doi:. (web Preprint)
[edit] External links
- HD 169830. SIMBAD. Retrieved on 2006-04-14.
- Notes for star HD 169830. The Extrasolar Planets Encyclopaedia. Retrieved on 2006-04-14.
- John Whatmough. HD 169830. Extrasolar Visions. Retrieved on 2006-04-14.
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