HD 159868
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| Observation data Epoch 2000 |
|
|---|---|
| Constellation (pronunciation) |
Scorpius |
| Right ascension | 17h 38m 59.526s |
| Declination | -43° 08′ 43.85″ |
| Apparent magnitude (V) | +7.24 |
| Distance | 171.93 ly (52.71 pc) |
| Spectral type | G5V |
| Other designations | |
HD 159868 is a G-type yellow dwarf star in the constellation Scorpius. It is a 7th magnitude star 3.05 times as luminous than our Sun. The distance is approximately 172 light years from Earth. The metallicity is identical to our Sun in value. There is one known planet orbiting this star.
[edit] HD 159868 b
| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
| Orbital elements | ||
| Semimajor axis | (a) | 2 ± 0.3 AU |
| Eccentricity | (e) | 0.69 ± 0.02 |
| Orbital period | (P) | 986 ± 9 d |
| Angular distance | (θ) | 37.951 mas |
| Longitude of periastron |
(ω) | 97 ± 3° |
| Time of periastron | (T0) | 2,450,700 ± 9 JD |
| Semi-amplitude | (K) | 43.3 ± 2 m/s |
| Physical characteristics | ||
| Mass | (m) | >1.7 ± 0.3 MJ |
| Discovery information | ||
| Discovery date | February 9, 2007 | |
| Discoverer(s) | O'Toole et al. | |
| Detection method | radial velocity | |
| Discovery status | Published | |
HD 159868 b is a W-type planet that orbits HD 159868. It is a jovian planet. The orbit is extremely eccentric at the average distance of 2 AU. The orbital distance ranges from as close as 0.62 AU to as far as 3.38 AU.
[edit] References
- O'Toole et al. (2007). "New Planets around Three G Dwarfs". The Astrophysical Journal 660 (2): 1636 – 1641. doi:. (web Preprint)
[edit] External links
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