HD 102117
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| Observation data Epoch 2000 |
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|---|---|
| Constellation (pronunciation) |
Centaurus |
| Right ascension | 11h 44m 50.46s |
| Declination | -58° 42' 13.35" |
| Apparent magnitude (V) | 7.47 |
| Distance | 136.9 ly (50.00 pc) |
| Spectral type | G6V |
| Other designations | |
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CD-58°4207, HIP 57291
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HD 102117 is a yellow dwarf star (spectral type G6 V) about 130 light years from Earth in the constellation of Centaurus. Although it is cooler than our Sun it is brighter and thus more evolved. In 2004, scientists discovered a planet orbiting the star.
[edit] HD 102117 b
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Discovery
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|---|---|
| Discovered by | Tinney et al. |
| Discovery site | Australia |
| Discovery date | 2004 |
| Detection method | Radial velocity |
| Semi-major axis | 0.1532 ± 0.0088 AU |
| Eccentricity | 0.121 ± 0.082 |
| Orbital period | 20.8133 ± 0.0064 d |
| Angular distance | 3.648 mas |
| Longitude of periastron | 279° |
| Time of periastron | 2,450,942.2 ± 2.6 JD |
| Semi-amplitude | 11.8 ± 0.77 m/s |
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Physical characteristics
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| Mass | >0.172 ± 0.020 MJ |
HD 102117 b is a planet discovered orbiting the star in 2004. The planet is a small gas giant a fifth the size of Jupiter. It orbits very close to its star, but not in a "torch orbit" like the famous 51 Pegasi b. It is one of the smallest extrasolar planets discovered so far.
[edit] References
- Tinney et al. (2005). "Three Low-Mass Planets from the Anglo-Australian Planet Search". The Astrophysical Journal 623 (2): 1171 – 1179. doi:.
- Lovis et al. (2005). "The HARPS search for southern extra-solar planets III. Three Saturn-mass planets around HD 93083, HD 101930 and HD 102117" (abstract). Astronomy and Astrophysics 437: 1121 – 1126. doi:.
- Butler et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal 646 (1): 505 – 522. doi:. (web Preprint)
[edit] External links
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