The Kepler-217 system contains 3 exoplanets. It is located 3602.85 light years away from the solar system.
| Mass | 1.14 solar masses |
| Radius | 1.8 solar radiae |
| Temperature | 6171 kelvin |
| Stellar Metallicity | 0.09 decimal exponent |
| Age | 2.63 billion years |
At more than 10 Earth masses, Kepler-217 b 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 | 5.600 Earth masses |
| Density | 2.770 grams per cubic centimeter |
| Radius | 2.230 Earth radiae |
| Semi-major Axis | 0.065 AU |
| Eccentricity | 0 |
| Orbital Period | 5.375 days |
| Discovery Method | Transit |
| Discovery Facility | Kepler |
| Discovery Telescope | 0.95 m Kepler Telescope |
| Discovery Instrument | Kepler CCD Array |
| Discovery Date | 2014-03 |
| Reference | Rowe et al. 2014 |
At 4.070 Earth masses, Kepler-217 c is a so called Super Earth. Super Earths could be terrestrial worlds like Earth, but they could also be ocean worlds or terrestrial worlds wrapped in a substantial atmosphere, in which case some refer to them as Mini Neptunes.
| Mass | 4.080 Earth masses |
| Density | 3.540 grams per cubic centimeter |
| Radius | 1.850 Earth radiae |
| Semi-major Axis | 0.089 AU |
| Eccentricity | 0 |
| Orbital Period | 8.586 days |
| Discovery Method | Transit |
| Discovery Facility | Kepler |
| Discovery Telescope | 0.95 m Kepler Telescope |
| Discovery Instrument | Kepler CCD Array |
| Discovery Date | 2014-03 |
| Reference | Rowe et al. 2014 |
At 2.302 Earth masses, Kepler-217 d is a so called Super Earth. Super Earths could be terrestrial worlds like Earth, but they could also be ocean worlds or terrestrial worlds wrapped in a substantial atmosphere, in which case some refer to them as Mini Neptunes.
| Mass | 2.300 Earth masses |
| Density | 5.500 grams per cubic centimeter |
| Radius | 1.320 Earth radiae |
| Semi-major Axis | 0.0505 AU |
| Eccentricity | 0 |
| Orbital Period | 3.887 days |
| Discovery Method | Transit |
| Discovery Facility | Kepler |
| Discovery Telescope | 0.95 m Kepler Telescope |
| Discovery Instrument | Kepler CCD Array |
| Discovery Date | 2016-05 |
| Reference | Morton et al. 2016 |