The Kepler-18 system contains 3 exoplanets. It is located 1412.41 light years away from the solar system.
| Mass | 0.97 solar masses |
| Radius | 1.11 solar radiae |
| Temperature | 5345 kelvin |
| Stellar Metallicity | 0.19 decimal exponent |
| Age | 10 billion years |
At more than 10 Earth masses, Kepler-18 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 | 6.900 Earth masses |
| Density | 4.900 grams per cubic centimeter |
| Radius | 2.000 Earth radiae |
| Semi-major Axis | 0.0447 AU |
| Eccentricity | 0 |
| Orbital Period | 3.505 days |
| Discovery Method | Transit |
| Discovery Facility | Kepler |
| Discovery Telescope | 0.95 m Kepler Telescope |
| Discovery Instrument | Kepler CCD Array |
| Discovery Date | 2011-11 |
| Reference | Cochran et al. 2011 |
At more than 10 Earth masses, Kepler-18 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 | 17.300 Earth masses |
| Density | 0.590 grams per cubic centimeter |
| Radius | 5.490 Earth radiae |
| Semi-major Axis | 0.0752 AU |
| Eccentricity | 0 |
| Orbital Period | 7.642 days |
| Discovery Method | Transit |
| Discovery Facility | Kepler |
| Discovery Telescope | 0.95 m Kepler Telescope |
| Discovery Instrument | Kepler CCD Array |
| Discovery Date | 2011-11 |
| Reference | Cochran et al. 2011 |
At more than 10 Earth masses, Kepler-18 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 | 16.400 Earth masses |
| Density | 0.270 grams per cubic centimeter |
| Radius | 6.980 Earth radiae |
| Semi-major Axis | 0.1172 AU |
| Eccentricity | 0 |
| Orbital Period | 14.859 days |
| Discovery Method | Transit |
| Discovery Facility | Kepler |
| Discovery Telescope | 0.95 m Kepler Telescope |
| Discovery Instrument | Kepler CCD Array |
| Discovery Date | 2011-11 |
| Reference | Cochran et al. 2011 |