HD 17156 c
From Wikipedia, the free encyclopedia
| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
| Parent star | ||
| Star | HD 17156 | |
| Constellation | Cassiopeia | |
| Right ascension | (α) | 02h 49m 04.49s |
| Declination | (δ) | +71° 45′ 11.64″ |
| Distance | 255.19 ly (78.24 pc) | |
| Spectral type | G0 | |
| Orbital elements | ||
| Semimajor axis | (a) | 0.481 ± 0.001 AU |
| Eccentricity | (e) | 0.136 ± 0.005 |
| Orbital period | (P) | 111.314 ± 3 d |
| Angular distance | (θ) | 6.147 mas |
| Longitude of periastron |
(ω) | ?° |
| Time of periastron | (T0) | ? JD |
| Semi-amplitude | (K) | ? m/s |
| Physical characteristics | ||
| Mass | (m) | >0.063 ± 0.007 MJ |
| Discovery information | ||
| Discovery date | March 20, 2008 | |
| Discoverer(s) | Short et al. | |
| Detection method | Planetary pertubation | |
| Discovery site | ? | |
| Discovery status | Unconfirmed | |
HD 17156c is a neptunian exoplanet orbiting the star HD 17156 in the constellation Cassiopeia. This planet has a minimum mass of 0.063 Jupiter mass or 20 Earth masses and takes about 111.314 days or 0.305 year to orbit the star. This put it in the distance of 0.481 astronomical units or 72.0 gigameters with a moderate eccentricity. This planet was discovered on the vernal equinox of 2008 by analyzing pertubations with the inner planet HD 17156b. This discovery was only probable, but will likely to be published.
[edit] References
- Donald Short, William F. Welsh, Jerome A. Orosz, Gur Windmiller (2008). "Orbital Dynamics Of A Second Planet In HD17156". ApJ. Letters.
[edit] External links
- Notes for planet HD 17156c. The Extrasolar Planets Encyclopaedia.
