The Kepler-228 system contains 3 exoplanets. It is located 5363.99 light years away from the solar system.
| Mass | 0.95 solar masses |
| Radius | 1.01 solar radiae |
| Temperature | 6043 kelvin |
| Stellar Metallicity | -0.03 decimal exponent |
| Age | 0.3 billion years |
At 2.957 Earth masses, Kepler-228 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 | 2.960 Earth masses |
| Density | 4.540 grams per cubic centimeter |
| Radius | 1.530 Earth radiae |
| Semi-major Axis | 0.038 AU |
| Eccentricity | 0 |
| Orbital Period | 2.567 days |
| Discovery Method | Transit |
| Discovery Facility | Kepler |
| Discovery Telescope | 0.95 m Kepler Telescope |
| Discovery Instrument | Kepler CCD Array |
| Discovery Date | 2014-03 |
| Reference | Rowe et al. 2014 |
At more than 10 Earth masses, Kepler-228 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 | 7.750 Earth masses |
| Density | 2.160 grams per cubic centimeter |
| Radius | 2.700 Earth radiae |
| Semi-major Axis | 0.052 AU |
| Eccentricity | 0 |
| Orbital Period | 4.134 days |
| Discovery Method | Transit |
| Discovery Facility | Kepler |
| Discovery Telescope | 0.95 m Kepler Telescope |
| Discovery Instrument | Kepler CCD Array |
| Discovery Date | 2014-03 |
| Reference | Rowe et al. 2014 |
At more than 10 Earth masses, Kepler-228 d 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 | 15.400 Earth masses |
| Density | 1.280 grams per cubic centimeter |
| Radius | 4.040 Earth radiae |
| Semi-major Axis | 0.101 AU |
| Eccentricity | 0 |
| Orbital Period | 11.094 days |
| Discovery Method | Transit |
| Discovery Facility | Kepler |
| Discovery Telescope | 0.95 m Kepler Telescope |
| Discovery Instrument | Kepler CCD Array |
| Discovery Date | 2014-03 |
| Reference | Rowe et al. 2014 |