HD 83443
From Wikipedia, the free encyclopedia
| Observation data Epoch J2000 |
|
|---|---|
| Constellation (pronunciation) |
Vela |
| Right ascension | 9h 37m 11.83s |
| Declination | -43° 16′ 19.94″ |
| Apparent magnitude (V) | 8.24 |
| Distance | 141.9 ly (43.54 pc) |
| Spectral type | K0V |
| Other designations | |
|
CD-42°5452, HIP 47202
|
|
HD 83443 is an orange dwarf star approximately 142 light-years away in the constellation of Vela. As of 2000, at least one extrasolar planet has been confirmed to be orbiting the star.
[edit] Planetary system
In 2000, planet HD 83443 b was discovered in 2000 by the Geneva Extrasolar Planet Search Team led by Michel Mayor. It has a minimum mass comparable to Saturn's, and its orbit is one of the shortest known, 1/25th that of Earth's. It takes only three days to complete one revolution around the star. This hot Jupiter is likely to be slightly larger than Jupiter in radius.
In 2000, the same year that planet b was found, another planet around HD 83443 was announced by the Geneva Team. The new planet was designated as "HD 83443 c". It had a mass smaller than planet b and a short, very eccentric orbit. Its orbital period, 28.9 days, was especially interesting, because it indicated a 10:1 orbital resonance between the planets. However, a team led by astronomer Paul Butler did not detect any signal indicating the existence of the second planet. New observations by the HARPS instrument could not detect the signal either and the discovery claim had to be retracted. The origin of the signal, which was "highly significant" in the earlier data is not yet clear.
| Planet (in order from star) |
Mass (MJ) |
Orbital period (days) |
Semimajor axis (AU) |
Eccentricity |
|---|---|---|---|---|
| b | >0.38 | 2.98565 ± 0.00003 | 0.039 | 0.013 ± 0.013 |
[edit] References
- Eight New Very Low-Mass Companions to Solar-Type Stars Discovered at La Silla. European Southern Observatory Press Release. Retrieved on March 15, 2008.
- Butler et al. (2002). "On the Double-Planet System around HD 83443". The Astrophysical Journal 578 (1): 565 – 572. doi:.
- 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:. (web Preprint)
[edit] External links
- HD 83443. The Extrasolar Planets Encyclopaedia. Retrieved on 2008-06-11.
- HD 83443. Extrasolar Visions. Retrieved on 2008-06-11.
- HD 83443 c. Extrasolar Visions. Retrieved on 2008-06-11.
 |
This main sequence star-related article is a stub. You can help Wikipedia by expanding it. |
