Exoplanet · mini-Neptune
GJ 357 d
GJ 357 d is a mini-Neptune orbiting the star GJ 357. Its year lasts 55.7 Earth days. It was discovered in 2019 by the Radial Velocity method.
| Host star | GJ 357 |
|---|---|
| Distance | 30.8 light-years (9.44 pc) |
| Orbital period | 55.7 days |
| Orbital radius | 0.204 AU |
| Radius | 2.34 R⊕ · 0.209 R♃ |
| Mass (minimum) | 6.1 M⊕ · 0.0192 M♃ |
| Density | 2.62 g/cm³ |
| Equilibrium temperature | 220 K (-54 °C) |
| Stellar flux received | 0.38 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2019 |
| 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 0.88° across: 1.7 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 10.91. Visible from the whole Southern Hemisphere and north to latitude 68° N. South of latitude 68° S it never sets. It stands highest at midnight in February, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1995. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 546 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.