The Kepler-251 system contains 4 exoplanets. It is located 3015.72 light years away from the solar system.
| Mass | 0.95 solar masses |
| Radius | 0.89 solar radiae |
| Temperature | 5526 kelvin |
| Stellar Metallicity | -0.02 decimal exponent |
| Age | 3.63 billion years |
At 2.331 Earth masses, Kepler-251 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 | 2.330 Earth masses |
| Density | 5.440 grams per cubic centimeter |
| Radius | 1.330 Earth radiae |
| Semi-major Axis | 0.053 AU |
| Eccentricity | 0 |
| Orbital Period | 4.791 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-251 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 | 8.100 Earth masses |
| Density | 2.090 grams per cubic centimeter |
| Radius | 2.770 Earth radiae |
| Semi-major Axis | 0.122 AU |
| Eccentricity | 0 |
| Orbital Period | 16.514 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-251 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 | 8.100 Earth masses |
| Density | 2.090 grams per cubic centimeter |
| Radius | 2.770 Earth radiae |
| Semi-major Axis | 0.182 AU |
| Eccentricity | 0 |
| Orbital Period | 30.133 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-251 e 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 | 8.100 Earth masses |
| Density | 2.090 grams per cubic centimeter |
| Radius | 2.770 Earth radiae |
| Semi-major Axis | 0.404 AU |
| Eccentricity | 0 |
| Orbital Period | 99.640 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 |