The Kepler-304 system contains 4 exoplanets. It is located 1417.75 light years away from the solar system.
| Mass | 0.8 solar masses |
| Radius | 0.69 solar radiae |
| Temperature | 4731 kelvin |
| Stellar Metallicity | 0.05 decimal exponent |
| Age | 2.09 billion years |
At more than 10 Earth masses, Kepler-304 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 | 8.550 Earth masses |
| Density | 2.010 grams per cubic centimeter |
| Radius | 2.860 Earth radiae |
| Semi-major Axis | 0.039 AU |
| Eccentricity | 0 |
| Orbital Period | 3.296 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-304 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 | 5.350 Earth masses |
| Density | 2.880 grams per cubic centimeter |
| Radius | 2.170 Earth radiae |
| Semi-major Axis | 0.054 AU |
| Eccentricity | 0 |
| Orbital Period | 5.316 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-304 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 | 8.000 Earth masses |
| Density | 2.110 grams per cubic centimeter |
| Radius | 2.750 Earth radiae |
| Semi-major Axis | 0.08 AU |
| Eccentricity | 0 |
| Orbital Period | 9.653 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 1.870 Earth masses, Kepler-304 e 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 | 1.870 Earth masses |
| Density | 5.950 grams per cubic centimeter |
| Radius | 1.200 Earth radiae |
| Semi-major Axis | 0.0232 AU |
| Eccentricity | 0 |
| Orbital Period | 1.499 days |
| Discovery Method | Transit |
| Discovery Facility | Kepler |
| Discovery Telescope | 0.95 m Kepler Telescope |
| Discovery Instrument | Kepler CCD Array |
| Discovery Date | 2016-05 |
| Reference | Morton et al. 2016 |