Exoplanet
A 'mini-Neptune' thought to be a water world, with a thick steamy atmosphere shrouding its surface.
| Type | Exoplanet |
|---|---|
| Orbits | Gliese 1214 |
| Distance from Earth | 48 ly |
| Diameter | 33,512 km |
| Mass | 5.02 × 10²⁵ kg |
| Temperature | 280°C |
| Orbital period | 2 days |
| Apparent magnitude | 14.71 |
| Hemisphere | Both |
| Discovered | 2009 |
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 33,512 km across, GJ 1214 b is 2.6 times the diameter of Earth.
Its mass is 8.4 times the mass of Earth.
A single orbit takes 1.6 days.
The light reaching us from GJ 1214 b tonight left it around 48 years ago.
An average temperature of 553 K works out at 280 degrees Celsius, warmer than the 15 degrees Earth averages.
It has been on record since 2009.
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