The K2-81 system contains 1 exoplanet. It is located 822.95 light years away from the solar system.
| Mass | 0.75 solar masses |
| Radius | 0.63 solar radiae |
| Temperature | 4674.13 kelvin |
| Stellar Metallicity | - decimal exponent |
| Age | - billion years |
With a mass below 5 Earth masses, a density of 3.26, and a semi-major axis of 0.059 astronomical units, K2-81 b could, potentially, be an ocean world - a planet with no dry land.
| Mass | 4.540 Earth masses |
| Density | 3.260 grams per cubic centimeter |
| Radius | 1.970 Earth radiae |
| Semi-major Axis | 0.059 AU |
| Eccentricity | 0.06 |
| Orbital Period | 6.102 days |
| Discovery Method | Transit |
| Discovery Facility | K2 |
| Discovery Telescope | 0.95 m Kepler Telescope |
| Discovery Instrument | Kepler CCD Array |
| Discovery Date | 2016-09 |
| Reference | Crossfield et al. 2016 |