Exoplanet · mini-Neptune
GJ 180 d
GJ 180 d is a mini-Neptune orbiting the star GJ 180. Its year lasts 106 Earth days. It was discovered in 2020 by the Radial Velocity method.
| Host star | GJ 180 |
|---|---|
| Distance | 38.9 light-years (11.9 pc) |
| Orbital period | 106 days |
| Orbital radius | 0.309 AU |
| Eccentricity | 0.140 |
| Radius | 2.66 R⊕ · 0.237 R♃ |
| Mass (minimum) | 7.56 M⊕ · 0.0238 M♃ |
| Density | 2.21 g/cm³ |
| Equilibrium temperature | 188 K (-85 °C) |
| Stellar flux received | 0.136 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2020 |
| Discovered by | Multiple Facilities |
Habitable zone
Beyond the habitable zone: it receives only %14 of the light the Earth does, a frozen world.
Its star in the sky
In the planet's sky its star is a disc 0.71° across: 1.3 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.