The K2-243 system contains 2 exoplanets. It is located 870.39 light years away from the solar system.
| Mass | 1.29 solar masses |
| Radius | 1.39 solar radiae |
| Temperature | 6570 kelvin |
| Stellar Metallicity | -0.03 decimal exponent |
| Age | - billion years |
At more than 10 Earth masses, K2-243 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 | 5.350 Earth masses |
| Density | 2.880 grams per cubic centimeter |
| Radius | 2.170 Earth radiae |
| Semi-major Axis | 0.1087 AU |
| Eccentricity | NaN |
| Orbital Period | 11.542 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 |
With a mass below 5 Earth masses, a density of 3.18, and a semi-major axis of 0.1817 astronomical units, K2-243 c could, potentially, be an ocean world - a planet with no dry land.
| Mass | 4.700 Earth masses |
| Density | 3.180 grams per cubic centimeter |
| Radius | 2.010 Earth radiae |
| Semi-major Axis | 0.1817 AU |
| Eccentricity | NaN |
| Orbital Period | 24.946 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 |