The Kepler-188 system contains 2 exoplanets. It is located 3158.96 light years away from the solar system.
| Mass | 0.98 solar masses |
| Radius | 1.14 solar radiae |
| Temperature | 6021 kelvin |
| Stellar Metallicity | 0.14 decimal exponent |
| Age | 5.8 billion years |
At 3.466 Earth masses, Kepler-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 | 3.460 Earth masses |
| Density | 4.010 grams per cubic centimeter |
| Radius | 1.680 Earth radiae |
| Semi-major Axis | 0.032 AU |
| Eccentricity | 0 |
| Orbital Period | 2.062 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-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 | 10.300 Earth masses |
| Density | 1.740 grams per cubic centimeter |
| Radius | 3.190 Earth radiae |
| Semi-major Axis | 0.066 AU |
| Eccentricity | 0 |
| Orbital Period | 5.997 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 |