Exoplanet · Earth-sized rocky planet
GJ 238 b
GJ 238 b is a Earth-sized rocky planet orbiting the star GJ 238. Its year lasts 1.74 Earth days. It was discovered in 2024 by the Transit method.
| Host star | GJ 238 |
|---|---|
| Distance | 49.6 light-years (15.2 pc) |
| Orbital period | 41.9 hours |
| Orbital radius | 0.0212 AU |
| Radius | 0.566 R⊕ · 0.0505 R♃ |
| Mass | 0.126 M⊕ · 3.96 × 10⁻⁴ M♃ (estimated from the radius) |
| Density | 3.82 g/cm³ |
| Equilibrium temperature | 758 K (485 °C) |
| Stellar flux received | 229 × Earth |
| Discovery method | Transit |
| Discovery year | 2024 |
| Discovered by | Transiting Exoplanet Survey Satellite (TESS) |
Habitable zone
Inside the inner edge of the habitable zone: it receives 229 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 11° across: 20 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 11.62. Visible from the whole Southern Hemisphere and north to latitude 31° N. South of latitude 31° 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 1976. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 880 thousand years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.