The K2-3 system contains 3 exoplanets. It is located 143.75 light years away from the solar system.
| Mass | 0.6 solar masses |
| Radius | 0.56 solar radiae |
| Temperature | 3896 kelvin |
| Stellar Metallicity | -0.32 decimal exponent |
| Age | 1 billion years |
At more than 10 Earth masses, K2-3 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 | 6.480 Earth masses |
| Density | 3.700 grams per cubic centimeter |
| Radius | 1.980 Earth radiae |
| Semi-major Axis | 0.074 AU |
| Eccentricity | 0 |
| Orbital Period | 10.055 days |
| Discovery Method | Transit |
| Discovery Facility | K2 |
| Discovery Telescope | 0.95 m Kepler Telescope |
| Discovery Instrument | Kepler CCD Array |
| Discovery Date | 2015-05 |
| Reference | Crossfield et al. 2015 |
With a mass below 5 Earth masses, a density of 2.98, and a semi-major axis of 0.1345 astronomical units, K2-3 c could, potentially, be an ocean world - a planet with no dry land.
| Mass | 2.140 Earth masses |
| Density | 2.980 grams per cubic centimeter |
| Radius | 1.560 Earth radiae |
| Semi-major Axis | 0.1345 AU |
| Eccentricity | 0 |
| Orbital Period | 24.647 days |
| Discovery Method | Transit |
| Discovery Facility | K2 |
| Discovery Telescope | 0.95 m Kepler Telescope |
| Discovery Instrument | Kepler CCD Array |
| Discovery Date | 2015-05 |
| Reference | Crossfield et al. 2015 |
At 2.802 Earth masses, K2-3 d 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 | 2.800 Earth masses |
| Density | 5.620 grams per cubic centimeter |
| Radius | 1.530 Earth radiae |
| Semi-major Axis | 0.2097 AU |
| Eccentricity | 0 |
| Orbital Period | 44.556 days |
| Discovery Method | Transit |
| Discovery Facility | K2 |
| Discovery Telescope | 0.95 m Kepler Telescope |
| Discovery Instrument | Kepler CCD Array |
| Discovery Date | 2015-05 |
| Reference | Crossfield et al. 2015 |