| HD 216770 b | |
| Discoverer: | Mayor et al. |
| Discovery Site: |  California, USA |
| Discovered: | June 30, 2003 |
| Apsis: | astron |
| Aphelion: | 0.63AU |
| Perihelion: | 0.29AU |
| Semimajor: | 0.46AU |
| Eccentricity: | 0.37 ± 0.06 |
| Period: | 118.45 ± 0.55 d 0.32429 y |
| Avg Speed: | 42 |
| Time Periastron: | 2,452,672 ± 3.5 |
| Arg Peri: | 281 ± 10 |
| Semi-Amplitude: | 30.9 ± 1.9 |
| Mass: | >0.65 |
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.