Exoplanet · mini-Neptune
GJ 876 e
GJ 876 e is a mini-Neptune orbiting the star GJ 876. Its year lasts 124 Earth days. It was discovered in 2010 by the Radial Velocity method.
| Host star | GJ 876 |
|---|---|
| Distance | 15.2 light-years (4.68 pc) |
| Orbital period | 124 days |
| Orbital radius | 0.334 AU |
| Eccentricity | 0.055 |
| Radius | 3.92 R⊕ · 0.35 R♃ |
| Mass | 14.6 M⊕ · 0.0459 M♃ |
| Density | 1.33 g/cm³ |
| Surface gravity | 0.95 × Earth |
| Equilibrium temperature | 150 K (-123 °C) |
| Stellar flux received | 0.111 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2010 |
| Discovered by | W. M. Keck Observatory |
Habitable zone
Beyond the habitable zone: it receives only %11 of the light the Earth does, a frozen world.
Its star in the sky
In the planet's sky its star is a disc 0.48° across: 0.9 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 10.16. Visible from the whole Southern Hemisphere and north to latitude 76° N. South of latitude 76° S it never sets. It stands highest at midnight in September, the best time to observe it.
Light's journey
The light you see tonight set out around the year 2011. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 270 thousand years.
Planets in the same system
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.