The HD 217107 system contains 2 exoplanets. It is located 65.43 light years away from the solar system.
| Mass | 1 solar masses |
| Radius | 1.11 solar radiae |
| Temperature | 5622 kelvin |
| Stellar Metallicity | 0.36 decimal exponent |
| Age | 5.84 billion years |
At more than 50 Earth masses, HD 217107 b is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn.
| Mass | 413.179 Earth masses |
| Density | 0.903 grams per cubic centimeter |
| Radius | 13.600 Earth radiae |
| Semi-major Axis | 0.08 AU |
| Eccentricity | 0.13 |
| Orbital Period | 7.127 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | Lick Observatory |
| Discovery Telescope | 3.0 m C. Donald Shane Telescope |
| Discovery Instrument | Hamilton Echelle Spectrograph |
| Discovery Date | 1999-01 |
| Reference | Fischer et al. 1999 |
At more than 50 Earth masses, HD 217107 c is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn.
| Mass | 826.320 Earth masses |
| Density | 1.970 grams per cubic centimeter |
| Radius | 13.200 Earth radiae |
| Semi-major Axis | 5.32 AU |
| Eccentricity | 0.517 |
| Orbital Period | 4270.000 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | Lick Observatory |
| Discovery Telescope | 3.0 m C. Donald Shane Telescope |
| Discovery Instrument | Hamilton Echelle Spectrograph |
| Discovery Date | 2005-10 |
| Reference | Vogt et al. 2005 |