Exoplanet · mini-Neptune
GJ 1214 b
GJ 1214 b is a mini-Neptune orbiting the star Onkaria. Its year lasts 1.58 Earth days. It was discovered in 2009 by the Transit method.
| Host star | Onkaria |
|---|---|
| Distance | 47.8 light-years (14.6 pc) |
| Orbital period | 37.9 hours |
| Orbital radius | 0.0151 AU |
| Eccentricity | 0.006 |
| Radius | 2.73 R⊕ · 0.244 R♃ |
| Mass | 8.41 M⊕ · 0.0265 M♃ |
| Density | 2.26 g/cm³ |
| Surface gravity | 1.13 × Earth |
| Equilibrium temperature | 567 K (294 °C) |
| Stellar flux received | 17.2 × Earth |
| Discovery method | Transit |
| Discovery year | 2009 |
| Discovered by | MEarth Project |
Habitable zone
Inside the inner edge of the habitable zone: it receives 17.2 times the light the Earth does, too hot to keep liquid water on its surface.
Its star in the sky
In the planet's sky its star is a disc 7.6° across: 14 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 14.67. Visible from the whole Northern Hemisphere and south to latitude 85° S. It stands highest at midnight in June, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1978. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 847 thousand years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.