The K2-9 system contains 1 exoplanet. It is located 270.59 light years away from the solar system.
| Mass | 0.3 solar masses |
| Radius | 0.31 solar radiae |
| Temperature | 3390 kelvin |
| Stellar Metallicity | -0.25 decimal exponent |
| Age | 1 billion years |
At more than 10 Earth masses, K2-9 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 | 5.690 Earth masses |
| Density | 2.740 grams per cubic centimeter |
| Radius | 2.250 Earth radiae |
| Semi-major Axis | 0.091 AU |
| Eccentricity | NaN |
| Orbital Period | 18.450 days |
| Discovery Method | Transit |
| Discovery Facility | K2 |
| Discovery Telescope | 0.95 m Kepler Telescope |
| Discovery Instrument | Kepler CCD Array |
| Discovery Date | 2015-08 |
| Reference | Montet et al. 2015 |