Exoplanet · mini-Neptune
GJ 180 b
GJ 180 b is a mini-Neptune orbiting the star GJ 180. Its year lasts 17.1 Earth days. It was discovered in 2014 by the Radial Velocity method.
| Host star | GJ 180 |
|---|---|
| Distance | 38.9 light-years (11.9 pc) |
| Orbital period | 17.1 days |
| Orbital radius | 0.092 AU |
| Eccentricity | 0.070 |
| Radius | 2.43 R⊕ · 0.217 R♃ |
| Mass (minimum) | 6.49 M⊕ · 0.0204 M♃ |
| Density | 2.49 g/cm³ |
| Equilibrium temperature | 344 K (71 °C) |
| Stellar flux received | 1.54 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2014 |
| Discovered by | Multiple Observatories |
Habitable zone
At the edge of the habitable zone (within the optimistic limits): liquid water would be possible only with a favourable atmosphere.
Its star in the sky
In the planet's sky its star is a disc 2.4° across: 4.5 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 10.90. Visible from the whole Southern Hemisphere and north to latitude 72° N. South of latitude 72° S it never sets. It stands highest at midnight in December, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1987. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 691 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.