The Kepler-261 system contains 2 exoplanets. It is located 1035.54 light years away from the solar system.
| Mass | 0.88 solar masses |
| Radius | 0.79 solar radiae |
| Temperature | 5098 kelvin |
| Stellar Metallicity | 0.162 decimal exponent |
| Age | 3.98 billion years |
At more than 10 Earth masses, Kepler-261 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 | 5.390 Earth masses |
| Density | 2.860 grams per cubic centimeter |
| Radius | 2.180 Earth radiae |
| Semi-major Axis | 0.088 AU |
| Eccentricity | 0 |
| Orbital Period | 10.381 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 3.2, and a semi-major axis of 0.156 astronomical units, Kepler-261 c could, potentially, be an ocean world - a planet with no dry land.
| Mass | 4.660 Earth masses |
| Density | 3.200 grams per cubic centimeter |
| Radius | 2.000 Earth radiae |
| Semi-major Axis | 0.156 AU |
| Eccentricity | 0 |
| Orbital Period | 24.571 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 |