The Kepler-191 system contains 3 exoplanets. It is located 1938.88 light years away from the solar system.
| Mass | 0.81 solar masses |
| Radius | 0.79 solar radiae |
| Temperature | 5282 kelvin |
| Stellar Metallicity | 0.13 decimal exponent |
| Age | 0.9 billion years |
At 2.360 Earth masses, Kepler-191 b 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 | 2.360 Earth masses |
| Density | 5.390 grams per cubic centimeter |
| Radius | 1.340 Earth radiae |
| Semi-major Axis | 0.087 AU |
| Eccentricity | 0 |
| Orbital Period | 9.940 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 4.134 Earth masses, Kepler-191 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 | 4.120 Earth masses |
| Density | 3.520 grams per cubic centimeter |
| Radius | 1.860 Earth radiae |
| Semi-major Axis | 0.128 AU |
| Eccentricity | 0 |
| Orbital Period | 17.739 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-191 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 | 5.820 Earth masses |
| Density | 2.700 grams per cubic centimeter |
| Radius | 2.280 Earth radiae |
| Semi-major Axis | 0.0599 AU |
| Eccentricity | 0 |
| Orbital Period | 5.945 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 |