HD 117618
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| Observation data Epoch 2000 |
|
|---|---|
| Constellation (pronunciation) |
Centaurus |
| Right ascension | 13h 32m 25.56s |
| Declination | -47° 16' 16.91" |
| Apparent magnitude (V) | 7.18 |
| Distance | 124.0 ly (38.02 pc) |
| Spectral type | G2V |
| Other designations | |
|
CD-46°8708, HIP 66047
|
|
HD 117618 is a yellow dwarf star (spectral type G2 V) 124 light years from Earth in the constellation of Centaurus. It is very similar to our Sun and is only slightly brighter. It is orbited by a recently discovered planet.
[edit] HD 117618 b
| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
| Orbital elements | ||
| Semimajor axis | (a) | 0.176±0.010 AU |
| Eccentricity | (e) | 0.42±0.17 |
| Orbital period | (P) | 25.827±0.019 d |
| Angular distance | (θ) | 7.368 mas |
| Longitude of periastron |
(ω) | 254±19° |
| Time of periastron | (T0) | 2,450,832.2±1.8 JD |
| Semi-amplitude | (K) | 12.8±2.2 m/s |
| Physical characteristics | ||
| Mass | (m) | >0.178±0.021 MJ |
| Discovery information | ||
| Discovery date | 2004 | |
| Discoverer(s) | C.G. Tinney, Butler, Marcy et al. |
|
| Detection method | Radial velocity | |
| Discovery status | Published | |
HD 117618 b is a planet discovered orbiting the star in 2004. The planet is a small gas giant with a fifth the mass of Jupiter. It orbits close to its star in a very eccentric orbit.
[edit] References
- Tinney et al. (2005). "Three Low-Mass Planets from the Anglo-Australian Planet Search". The Astrophysical Journal 623 (2): 1171 – 1179. doi:.
- Butler et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal 646 (1): 505 – 522. doi:. (web Preprint)
[edit] External links
- SIMBAD entry
- The Extrasolar Planets Encyclopaedia entry
- Extrasolar Visions entry
- California & Carnegie Planet Search entry
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