Exoplanet
Considered the most Earth-like of the seven rocky planets in the TRAPPIST-1 system, likely capable of retaining liquid water.
| Type | Exoplanet |
|---|---|
| Orbits | TRAPPIST-1 |
| Distance from Earth | 40.7 ly |
| Diameter | 11,700 km |
| Mass | 4.13 × 10²⁴ kg |
| Temperature | -23°C |
| Orbital period | 6 days |
| Apparent magnitude | 18.8 |
| Hemisphere | Southern |
| Discovered | 2017 |
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 11,700 km across, TRAPPIST-1e is 92 percent of the diameter of Earth.
Its mass is 69 percent of the mass of Earth.
A single orbit takes 6.1 days.
The light reaching us from TRAPPIST-1e tonight left it around 41 years ago.
Of the 22 exoplanets these pages cover, only 2 lie closer to us.
An average temperature of 250 K works out at -23 degrees Celsius, colder than the 15 degrees Earth averages.
It has been on record since 2017.
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