The HD 217786 system contains 2 exoplanets. It is located 180.97 light years away from the solar system.
| Mass | 1.14 solar masses |
| Radius | 1.27 solar radiae |
| Temperature | 5966 kelvin |
| Stellar Metallicity | -0.135 decimal exponent |
| Age | 7.6 billion years |
At more than 50 Earth masses, HD 217786 b is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn.
| Mass | 4402.888 Earth masses |
| Density | 13.000 grams per cubic centimeter |
| Radius | 12.300 Earth radiae |
| Semi-major Axis | 2.44502 AU |
| Eccentricity | 0.310811 |
| Orbital Period | 1301.360 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | La Silla Observatory |
| Discovery Telescope | 3.6 m ESO Telescope |
| Discovery Instrument | HARPS Spectrograph |
| Discovery Date | 2011-03 |
| Reference | Moutou et al. 2011 |
At more than 10 Earth masses, HD 217786 c is an ice giant, a planet that is made up mostly of volatiles like water, amonia and methane, and enveloped by a dense hydrogen and helium atmosphere, much like Uranus and Neptune.
| Mass | 7.359 Earth masses |
| Density | 2.250 grams per cubic centimeter |
| Radius | 2.620 Earth radiae |
| Semi-major Axis | 0.037863 AU |
| Eccentricity | -0.518659 |
| Orbital Period | 2.522 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | Multiple Observatories |
| Discovery Telescope | Multiple Telescopes |
| Discovery Instrument | Multiple Instruments |
| Discovery Date | 2022-09 |
| Reference | Feng et al. 2022 |