The K2-90 system contains 2 exoplanets. It is located 437.66 light years away from the solar system.
| Mass | 0.63 solar masses |
| Radius | 0.62 solar radiae |
| Temperature | 4484 kelvin |
| Stellar Metallicity | -0.225 decimal exponent |
| Age | - billion years |
At more than 10 Earth masses, K2-90 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 | 7.270 Earth masses |
| Density | 2.270 grams per cubic centimeter |
| Radius | 2.600 Earth radiae |
| Semi-major Axis | 0.096 AU |
| Eccentricity | 0.07 |
| Orbital Period | 13.733 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 |
At 2.242 Earth masses, K2-90 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 | 2.240 Earth masses |
| Density | 5.600 grams per cubic centimeter |
| Radius | 1.300 Earth radiae |
| Semi-major Axis | 0.035 AU |
| Eccentricity | 0.19 |
| Orbital Period | 2.901 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 |