The K2-158 system contains 2 exoplanets. It is located 643.50 light years away from the solar system.
| Mass | 0.92 solar masses |
| Radius | 0.95 solar radiae |
| Temperature | 5503 kelvin |
| Stellar Metallicity | 0.07 decimal exponent |
| Age | - billion years |
At more than 10 Earth masses, K2-158 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 | 7.460 Earth masses |
| Density | 2.230 grams per cubic centimeter |
| Radius | 2.640 Earth radiae |
| Semi-major Axis | 0.0887 AU |
| Eccentricity | NaN |
| Orbital Period | 10.060 days |
| Discovery Method | Transit |
| Discovery Facility | K2 |
| Discovery Telescope | 0.95 m Kepler Telescope |
| Discovery Instrument | Kepler CCD Array |
| Discovery Date | 2018-03 |
| Reference | Mayo et al. 2018 |
At 2.185 Earth masses, K2-158 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 | 2.180 Earth masses |
| Density | 5.710 grams per cubic centimeter |
| Radius | 1.280 Earth radiae |
| Semi-major Axis | 0.0622 AU |
| Eccentricity | NaN |
| Orbital Period | 5.903 days |
| Discovery Method | Transit |
| Discovery Facility | K2 |
| Discovery Telescope | 0.95 m Kepler Telescope |
| Discovery Instrument | Kepler CCD Array |
| Discovery Date | 2018-08 |
| Reference | Livingston et al. 2018 |