The Kepler-291 system contains 2 exoplanets. It is located 5826.71 light years away from the solar system.
| Mass | 0.9 solar masses |
| Radius | 1.02 solar radiae |
| Temperature | 6002 kelvin |
| Stellar Metallicity | -0.11 decimal exponent |
| Age | 0.3 billion years |
At more than 10 Earth masses, Kepler-291 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 | 5.310 Earth masses |
| Density | 2.900 grams per cubic centimeter |
| Radius | 2.160 Earth radiae |
| Semi-major Axis | 0.047 AU |
| Eccentricity | 0 |
| Orbital Period | 3.547 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 3.47, and a semi-major axis of 0.065 astronomical units, Kepler-291 c could, potentially, be an ocean world - a planet with no dry land.
| Mass | 4.190 Earth masses |
| Density | 3.470 grams per cubic centimeter |
| Radius | 1.880 Earth radiae |
| Semi-major Axis | 0.065 AU |
| Eccentricity | 0 |
| Orbital Period | 5.701 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 |