The Kepler-903 system contains 2 exoplanets. It is located 4465.86 light years away from the solar system.
| Mass | 0.98 solar masses |
| Radius | 0.97 solar radiae |
| Temperature | 5682 kelvin |
| Stellar Metallicity | 0.05 decimal exponent |
| Age | 4.79 billion years |
With a mass below 5 Earth masses, a density of 3.18, and a semi-major axis of 0.0907 astronomical units, Kepler-903 b could, potentially, be an ocean world - a planet with no dry land.
| Mass | 4.700 Earth masses |
| Density | 3.180 grams per cubic centimeter |
| Radius | 2.010 Earth radiae |
| Semi-major Axis | 0.0907 AU |
| Eccentricity | 0 |
| Orbital Period | 10.351 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 |
At more than 10 Earth masses, Kepler-903 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 | 6.940 Earth masses |
| Density | 2.350 grams per cubic centimeter |
| Radius | 2.530 Earth radiae |
| Semi-major Axis | 0.302 AU |
| Eccentricity | 0 |
| Orbital Period | 62.923 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 |