The Kepler-198 system contains 3 exoplanets. It is located 1615.64 light years away from the solar system.
| Mass | 0.97 solar masses |
| Radius | 0.94 solar radiae |
| Temperature | 5574 kelvin |
| Stellar Metallicity | 0.114 decimal exponent |
| Age | 3.72 billion years |
At more than 10 Earth masses, Kepler-198 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 | 8.350 Earth masses |
| Density | 2.050 grams per cubic centimeter |
| Radius | 2.820 Earth radiae |
| Semi-major Axis | 0.131 AU |
| Eccentricity | 0 |
| Orbital Period | 17.790 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 more than 10 Earth masses, Kepler-198 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 | 6.660 Earth masses |
| Density | 2.430 grams per cubic centimeter |
| Radius | 2.470 Earth radiae |
| Semi-major Axis | 0.259 AU |
| Eccentricity | 0 |
| Orbital Period | 49.567 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 2.957 Earth masses, Kepler-198 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 | 2.960 Earth masses |
| Density | 4.540 grams per cubic centimeter |
| Radius | 1.530 Earth radiae |
| Semi-major Axis | 0.0229 AU |
| Eccentricity | 0 |
| Orbital Period | 1.312 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 |