The K2-155 system contains 3 exoplanets. It is located 237.44 light years away from the solar system.
| Mass | 0.65 solar masses |
| Radius | 0.58 solar radiae |
| Temperature | 4258 kelvin |
| Stellar Metallicity | -0.3 decimal exponent |
| Age | - billion years |
At 3.911 Earth masses, K2-155 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 | 3.890 Earth masses |
| Density | 3.670 grams per cubic centimeter |
| Radius | 1.800 Earth radiae |
| Semi-major Axis | 0.0562 AU |
| Eccentricity | NaN |
| Orbital Period | 6.342 days |
| Discovery Method | Transit |
| Discovery Facility | K2 |
| Discovery Telescope | 0.95 m Kepler Telescope |
| Discovery Instrument | Kepler CCD Array |
| Discovery Date | 2018-03 |
| Reference | Hirano et al. 2018 |
At more than 10 Earth masses, K2-155 c 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 | 0.0946 AU |
| Eccentricity | NaN |
| Orbital Period | 13.850 days |
| Discovery Method | Transit |
| Discovery Facility | K2 |
| Discovery Telescope | 0.95 m Kepler Telescope |
| Discovery Instrument | Kepler CCD Array |
| Discovery Date | 2018-03 |
| Reference | Hirano et al. 2018 |
With a mass below 5 Earth masses, a density of 3.42, and a semi-major axis of 0.1937 astronomical units, K2-155 d could, potentially, be an ocean world - a planet with no dry land.
| Mass | 4.270 Earth masses |
| Density | 3.420 grams per cubic centimeter |
| Radius | 1.900 Earth radiae |
| Semi-major Axis | 0.1937 AU |
| Eccentricity | NaN |
| Orbital Period | 40.718 days |
| Discovery Method | Transit |
| Discovery Facility | K2 |
| Discovery Telescope | 0.95 m Kepler Telescope |
| Discovery Instrument | Kepler CCD Array |
| Discovery Date | 2018-03 |
| Reference | Hirano et al. 2018 |