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HD 216770 b is an extrasolar planet orbiting the star HD 216770. It has a mass about two thirds that of Jupiter, largest planet in the Solar System. But unlike the gas giants in the Solar System, it orbits in a very eccentric orbit around the star. The mean distance from the star is slightly larger than Mercury's, and it completes one orbit around the star in every 118 days.[1]
| Discovery | |
|---|---|
| Discovered by | Mayor et al. |
| Discovery site |  California, USA |
| Discovery date | June 30, 2003 |
| Doppler spectroscopy | |
| Orbital characteristics | |
| Apastron | 0.63 AU (94,000,000 km) |
| Periastron | 0.29 AU (43,000,000 km) |
| 0.46 AU (69,000,000 km) | |
| Eccentricity | 0.37 ± 0.06 |
| 118.45 ± 0.55 d 0.32429 y | |
Average orbital speed | 42 |
| 2,452,672 ± 3.5 | |
| 281 ± 10 | |
| Semi-amplitude | 30.9 ± 1.9 |
| Star | HD 216770 |
| Physical characteristics | |
| Mass | >0.65 MJ |
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