The K2-188 system contains 2 exoplanets. It is located 1457.33 light years away from the solar system.
| Mass | 1.06 solar masses |
| Radius | 1.19 solar radiae |
| Temperature | 5977 kelvin |
| Stellar Metallicity | -0.01 decimal exponent |
| Age | - billion years |
At 2.391 Earth masses, K2-188 b 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 | 2.390 Earth masses |
| Density | 5.340 grams per cubic centimeter |
| Radius | 1.350 Earth radiae |
| Semi-major Axis | 0.0289 AU |
| Eccentricity | NaN |
| Orbital Period | 1.742 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 more than 10 Earth masses, K2-188 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 | 8.400 Earth masses |
| Density | 2.040 grams per cubic centimeter |
| Radius | 2.830 Earth radiae |
| Semi-major Axis | 0.0785 AU |
| Eccentricity | NaN |
| Orbital Period | 7.810 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 |