Exoplanet
The first Earth-sized planet found within the habitable zone of another star, orbiting a cool red dwarf.
| Type | Exoplanet |
|---|---|
| Orbits | Kepler-186 |
| Distance from Earth | 582 ly |
| Diameter | 14,908 km |
| Mass | 1.02 × 10²⁵ kg |
| Temperature | -96°C |
| Orbital period | 130 days |
| Apparent magnitude | 14.62 |
| Hemisphere | Northern |
| Discovered | 2014 |
Every exoplanet here was found indirectly, by the wobble or the dimming it causes in its own star, since none is close enough to photograph in real detail.
At 14,908 km across, Kepler-186f is 1.2 times the diameter of Earth.
Its mass is 1.7 times the mass of Earth.
A single orbit takes 129.9 days.
The light reaching us from Kepler-186f tonight left it around 582 years ago.
An average temperature of 177 K works out at -96 degrees Celsius, colder than the 15 degrees Earth averages.
It has been on record since 2014.
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