The Kepler-303 system contains 2 exoplanets. It is located 684.07 light years away from the solar system.
| Mass | 0.57 solar masses |
| Radius | 0.48 solar radiae |
| Temperature | 3944 kelvin |
| Stellar Metallicity | -0.414 decimal exponent |
| Age | 3.31 billion years |
At less than 1.5 Earth masses, Kepler-303 b is a terrestrial planet, much like the terrestrial planets we find in our solar system, namely Mercury, Venus, Earth and Mars.
| Mass | 0.640 Earth masses |
| Density | 4.990 grams per cubic centimeter |
| Radius | 0.890 Earth radiae |
| Semi-major Axis | 0.024 AU |
| Eccentricity | 0 |
| Orbital Period | 1.937 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 1.555 Earth masses, Kepler-303 c 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 | 1.550 Earth masses |
| Density | 5.750 grams per cubic centimeter |
| Radius | 1.140 Earth radiae |
| Semi-major Axis | 0.057 AU |
| Eccentricity | 0 |
| Orbital Period | 7.061 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 |