The Kepler-289 system contains 3 exoplanets. It is located 2297.57 light years away from the solar system.
| Mass | 1.08 solar masses |
| Radius | 1 solar radiae |
| Temperature | 5990 kelvin |
| Stellar Metallicity | 0.05 decimal exponent |
| Age | 0.65 billion years |
At more than 10 Earth masses, Kepler-289 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 | 7.300 Earth masses |
| Density | 4.100 grams per cubic centimeter |
| Radius | 2.150 Earth radiae |
| Semi-major Axis | 0.21 AU |
| Eccentricity | 0 |
| Orbital Period | 34.545 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 50 Earth masses, Kepler-289 c is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn.
| Mass | 132.000 Earth masses |
| Density | 0.470 grams per cubic centimeter |
| Radius | 11.590 Earth radiae |
| Semi-major Axis | 0.51 AU |
| Eccentricity | 0 |
| Orbital Period | 125.852 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 |
With a mass below 5 Earth masses, a density of 1.2, and a semi-major axis of 0.33 astronomical units, Kepler-289 d could, potentially, be an ocean world - a planet with no dry land.
| Mass | 4.000 Earth masses |
| Density | 1.200 grams per cubic centimeter |
| Radius | 2.680 Earth radiae |
| Semi-major Axis | 0.33 AU |
| Eccentricity | NaN |
| Orbital Period | 66.063 days |
| Discovery Method | Transit |
| Discovery Facility | Kepler |
| Discovery Telescope | 0.95 m Kepler Telescope |
| Discovery Instrument | Kepler CCD Array |
| Discovery Date | 2014-11 |
| Reference | Schmitt et al. 2014 |