The Kepler-189 system contains 2 exoplanets. It is located 1929.32 light years away from the solar system.
| Mass | 0.79 solar masses |
| Radius | 0.75 solar radiae |
| Temperature | 5235 kelvin |
| Stellar Metallicity | -0.02 decimal exponent |
| Age | 0.7 billion years |
At 1.927 Earth masses, Kepler-189 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 | 1.920 Earth masses |
| Density | 5.960 grams per cubic centimeter |
| Radius | 1.210 Earth radiae |
| Semi-major Axis | 0.088 AU |
| Eccentricity | 0 |
| Orbital Period | 10.400 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-189 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 | 22.700 Earth masses |
| Density | 9.250 grams per cubic centimeter |
| Radius | 2.380 Earth radiae |
| Semi-major Axis | 0.137 AU |
| Eccentricity | 0 |
| Orbital Period | 20.135 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 |