The K2-128 system contains 1 exoplanet. It is located 373.90 light years away from the solar system.
| Mass | 0.71 solar masses |
| Radius | 0.78 solar radiae |
| Temperature | 4469.51 kelvin |
| Stellar Metallicity | -0.26 decimal exponent |
| Age | - billion years |
At 2.604 Earth masses, K2-128 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 | 2.600 Earth masses |
| Density | 4.990 grams per cubic centimeter |
| Radius | 1.420 Earth radiae |
| Semi-major Axis | 0.056 AU |
| Eccentricity | 0.23 |
| Orbital Period | 5.676 days |
| Discovery Method | Transit |
| Discovery Facility | K2 |
| Discovery Telescope | 0.95 m Kepler Telescope |
| Discovery Instrument | Kepler CCD Array |
| Discovery Date | 2017-11 |
| Reference | Dressing et al. 2017 |