Exoplanet
A habitable-zone sub-Neptune where water vapor and carbon-bearing molecules have been detected, making it a leading candidate ocean world.
| Type | Exoplanet |
|---|---|
| Orbits | K2-18 |
| Distance from Earth | 124 ly |
| Diameter | 30,199 km |
| Mass | 5.15 × 10^25 kg |
| Temperature | -1°C |
| Orbital period | 33 days |
| Discovered | 2015 |
At 30,199 km across, K2-18 b is 2.4 times the diameter of Earth.
Its mass is 8.6 times the mass of Earth.
A single orbit takes 32.9 days.
The light reaching us from K2-18 b tonight left it around 124 years ago.
An average temperature of 272 K works out at -1 degrees Celsius, colder than the 15 degrees Earth averages.
It has been on record since 2015.
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