The Kepler-121 system contains 2 exoplanets. It is located 1665.10 light years away from the solar system.
| Mass | 0.86 solar masses |
| Radius | 0.7 solar radiae |
| Temperature | 5311 kelvin |
| Stellar Metallicity | -0.08 decimal exponent |
| Age | 0.5 billion years |
At more than 10 Earth masses, Kepler-121 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 | 6.080 Earth masses |
| Density | 2.610 grams per cubic centimeter |
| Radius | 2.340 Earth radiae |
| Semi-major Axis | 0.039 AU |
| Eccentricity | 0 |
| Orbital Period | 3.177 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-121 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 | 5.770 Earth masses |
| Density | 2.710 grams per cubic centimeter |
| Radius | 2.270 Earth radiae |
| Semi-major Axis | 0.216 AU |
| Eccentricity | 0 |
| Orbital Period | 41.008 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 |