Exoplanet · mini-Neptune
GJ 876 d
GJ 876 d is a mini-Neptune orbiting the star GJ 876. Its year lasts 1.94 Earth days. It was discovered in 2005 by the Radial Velocity method.
| Host star | GJ 876 |
|---|---|
| Distance | 15.2 light-years (4.68 pc) |
| Orbital period | 46.5 hours |
| Orbital radius | 0.0208 AU |
| Eccentricity | 0.207 |
| Radius | 2.51 R⊕ · 0.224 R♃ |
| Mass | 6.83 M⊕ · 0.0215 M♃ |
| Density | 2.37 g/cm³ |
| Surface gravity | 1.08 × Earth |
| Equilibrium temperature | 603 K (330 °C) |
| Stellar flux received | 28.6 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2005 |
| Discovered by | W. M. Keck Observatory |
Habitable zone
Inside the inner edge of the habitable zone: it receives 28.6 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 7.7° 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 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.