The K2-187 system contains 4 exoplanets. It is located 1079.30 light years away from the solar system.
| Mass | 0.97 solar masses |
| Radius | 0.83 solar radiae |
| Temperature | 5438 kelvin |
| Stellar Metallicity | 0 decimal exponent |
| Age | - billion years |
At 1.870 Earth masses, K2-187 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 | 1.870 Earth masses |
| Density | 5.950 grams per cubic centimeter |
| Radius | 1.200 Earth radiae |
| Semi-major Axis | 0.0164 AU |
| Eccentricity | NaN |
| Orbital Period | 0.774 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 2.544 Earth masses, K2-187 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 | 2.540 Earth masses |
| Density | 5.090 grams per cubic centimeter |
| Radius | 1.400 Earth radiae |
| Semi-major Axis | 0.0392 AU |
| Eccentricity | NaN |
| Orbital Period | 2.872 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, K2-187 d 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 | 6.350 Earth masses |
| Density | 2.520 grams per cubic centimeter |
| Radius | 2.400 Earth radiae |
| Semi-major Axis | 0.072 AU |
| Eccentricity | NaN |
| Orbital Period | 7.150 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 |
With a mass below 5 Earth masses, a density of 3.42, and a semi-major axis of 0.1106 astronomical units, K2-187 e could, potentially, be an ocean world - a planet with no dry land.
| Mass | 4.270 Earth masses |
| Density | 3.420 grams per cubic centimeter |
| Radius | 1.900 Earth radiae |
| Semi-major Axis | 0.1106 AU |
| Eccentricity | NaN |
| Orbital Period | 13.607 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 |