HD 82943
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| Observation data Epoch 2000 |
|
|---|---|
| Constellation (pronunciation) |
Hydra |
| Right ascension | 09h 34m 50.736s |
| Declination | −12° 07' 46.365" |
| Apparent magnitude (V) | 6.54 |
| Distance | 89.56 ly (27.46 pc) |
| Spectral type | G0V |
| Other designations | |
|
BD-11°2670, HIP 47007
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|
HD 82943 is a yellow dwarf star (spectral type G0) in the constellation of Hydra, 89.5 light years from our solar system. It is known to be orbited by at least two large extrasolar planets which are locked in a 2:1 orbital resonance.
Contents |
[edit] Planets
[edit] HD 82943 c
| Orbital elements | ||
|---|---|---|
| Semi-major axis a: | 0.75 AU | |
| Eccentricity e: | 0.38± 0.01 | |
| Orbital period P: | 219.4 ± 0.2 d | |
| Inclination i: | ?° | |
| Angular distance θ: | 27.167 mas | |
| Longitude of periastron ω: |
124 ± 3° | |
| Time of periastron τ: | 2,452,284 ± 1 JD | |
| Semi-amplitude K: | 41.7 ± 0.91 m/s | |
| Physical characteristics | ||
| Mass: | >1.85 MJ | |
| Radius: | ? RJ | |
| Density: | ? kg/m³ | |
| Gravity: | ? g | |
| Temperature: | ? K | |
| Discovery | ||
| Discovery date: | 2001 | |
| Discovery site: | ||
| Detection method(s): | ||
| Discoverer(s): | Mayor, Udry et al. | |
| Other catalogue | ||
HD 82943 c is a gas giant planet almost identical to HD 82943 b in mass. It has an eccentric orbit that sometimes places it very close to the star, and sometimes within its habitable zone.
[edit] HD 82943 b
| Orbital elements | ||
|---|---|---|
| Semi-major axis a: | 1.18 AU | |
| Eccentricity e: | 0.18± 0.04 | |
| Orbital period P: | 435.1 ± 1.4 d | |
| Inclination i: | ?° | |
| Angular distance θ: | 43.336 mas | |
| Longitude of periastron ω: |
237 ± 13° | |
| Time of periastron τ: | 2,451,758 ± 13 JD | |
| Semi-amplitude K: | 59.3 ± 5.2 m/s | |
| Physical characteristics | ||
| Mass: | >1.84 MJ | |
| Radius: | ? RJ | |
| Density: | ? kg/m³ | |
| Gravity: | ? g | |
| Temperature: | ? K | |
| Discovery | ||
| Discovery date: | 2000 | |
| Discovery site: | ||
| Detection method(s): | ||
| Discoverer(s): | Mayor, Udry et al. | |
| Other catalogue | ||
HD 82943 b is a gas giant one and a half times the mass of Jupiter. Its orbit is entirely within the star's habitable zone. This means that it might have large moons with atmospheres capable of harboring life.
[edit] References
- 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:.
- Butler, R. et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal 646: 505 – 522. doi:. (web Preprint)
- Lee et al. (2006). "On the 2:1 Orbital Resonance in the HD 82943 Planetary System". The Astrophysical Journal 641: 1178 – 1187. doi:. (web Preprint)
[edit] External links
- http://www.extrasolar.net/planettour.asp?StarCatId=&PlanetId=168
- http://www.extrasolar.net/planettour.asp?StarCatId=&PlanetId=131
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