Exoplanet · mini-Neptune
HD 20794 d
HD 20794 d is a mini-Neptune orbiting the star 82 G. Eri. Its year lasts 89.7 Earth days. It was discovered in 2011 by the Radial Velocity method.
| Host star | 82 G. Eri |
|---|---|
| Distance | 19.6 light-years (6.00 pc) |
| Orbital period | 89.7 days |
| Orbital radius | 0.363 AU |
| Eccentricity | 0.077 |
| Radius | 2.04 R⊕ · 0.182 R♃ |
| Mass | 4.8 M⊕ · 0.0151 M♃ |
| Density | 3.11 g/cm³ |
| Equilibrium temperature | 388 K (115 °C) |
| Stellar flux received | 5.23 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2011 |
| Discovered by | La Silla Observatory |
Habitable zone
Inside the inner edge of the habitable zone: it receives 5.23 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 1.4° across: 2.6 times the Sun as we see it from Earth.
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 4.26). Visible from the whole Southern Hemisphere and north to latitude 47° N. South of latitude 47° S it never sets. It stands highest at midnight in November, the best time to observe it.
Light's journey
The light you see tonight set out around the year 2006. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 347 thousand years.
Planets in the same system
- HD 20794 b 18.3-day orbit · 1.45 R⊕
- HD 20794 e 147-day orbit · 2.03 R⊕
- HD 20794 f 648-day orbit · 2.28 R⊕
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.