Exoplanet · mini-Neptune
Gl 378 b
Gl 378 b is a mini-Neptune orbiting the star Gl 378. Its year lasts 3.82 Earth days. It was discovered in 2019 by the Radial Velocity method.
| Host star | Gl 378 |
|---|---|
| Distance | 48.8 light-years (15.0 pc) |
| Orbital period | 3.82 days |
| Orbital radius | 0.0394 AU |
| Eccentricity | 0.109 |
| Radius | 3.66 R⊕ · 0.327 R♃ |
| Mass (minimum) | 13 M⊕ · 0.041 M♃ |
| Density | 1.46 g/cm³ |
| Equilibrium temperature | 830 K (557 °C) |
| Stellar flux received | 38.6 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2019 |
| Discovered by | Haute-Provence Observatory |
Habitable zone
Inside the inner edge of the habitable zone: it receives 38.6 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 7.6° across: 14 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 10.03. Visible from the whole Northern Hemisphere and south to latitude 42° S. North of latitude 42° N 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 1977. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 865 thousand years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.