Exoplanet · mini-Neptune
GJ 422 b
GJ 422 b is a mini-Neptune orbiting the star GJ 422. Its year lasts 20.1 Earth days. It was discovered in 2014 by the Radial Velocity method.
| Host star | GJ 422 |
|---|---|
| Distance | 41.3 light-years (12.7 pc) |
| Orbital period | 20.1 days |
| Orbital radius | 0.111 AU |
| Eccentricity | 0.110 |
| Radius | 3.33 R⊕ · 0.297 R♃ |
| Mass (minimum) | 11.1 M⊕ · 0.0348 M♃ |
| Density | 1.65 g/cm³ |
| Equilibrium temperature | 293 K (20 °C) |
| Stellar flux received | 0.893 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2014 |
| Discovered by | Multiple Observatories |
Habitable zone
Inside its star's habitable zone: it receives enough light for liquid water to exist on its surface under a suitable atmosphere.
Its star in the sky
In the planet's sky its star is a disc 1.8° across: 3.3 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 11.66. Visible from the whole Southern Hemisphere and north to latitude 32° N. South of latitude 32° S it never sets. It stands highest at midnight in March, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1985. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 733 thousand years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.