| Planet | Description (in order from the star; all quoted values are approximate) |
| Kepler 186 b | This planet, the inner most, orbits its star at a distance of about 5,655,000 km (c. 3½ million miles) once every 3 days, 21 hours, and 17 minutes. It's diameter is about 8% larger than the Earth's. |
| Kepler 186 c | This planet orbits Kepler-186 at a distance of about 8,587,000 km (c. 5.34 million miles) once every 7 days, 6 hours, and 25 minutes. It's diameter is about 25% larger than the Earth's. |
| Kepler 186 d | This planet orbits Kepler-186 at a distance of about 12,880,000 km (c. 8 million miles) once every 13 days, 8 hours, and 14 minutes. It's diameter is about 39% larger than the Earth's. |
| Kepler 186 e | This planet orbits Kepler-186 at a distance of about 18,191,000 km (c. 11.3 million miles) once every 22 days, 9 hours, and 47 minutes. It's diameter is about 33% larger than the Earth's. |
| Kepler 186 f | This planet orbits Kepler-186 at a distance of about 58,732,000 km (c. 36.5 million miles) once every 129 days, 22 hours, and 42 minutes. It's diameter is about 11% larger than the Earth's. Kepler-186f is too far away for current telescopes to analyze its atmosphere, and it is unlikely that the James Webb Space Telescope would be able to do so. The planet is probably far enough away from its parent star to have retained enough of its spin not to be tidally locked; however, it probably spins qhite slowly so that its "day" could last for weeks or even months. Its orbit appears to be close to circular, and there seems to be little axial tilt leading to a lack of pronounced seasons. Kepler-186f is considered to be one of the best candidate planets to be potentially habitable. |
Extra Solar Planets
A type M1 dwarf star, Kepler-186 is approximately 492 light years away. At 3788K, it is somewhat cooler than the Sun (5,772K). It has about 48% the mass of our Sun, and is categorized as a BY Draconis variable. To date, five planets have been identified including the first Earth-sized planet lying in the habitable zone. The discovery of the four inner planets was confirmed in February 2014. Masses of the planets has yet to ne determined.