Exoplanet · Earth-sized rocky planet
SPECULOOS-3 b
SPECULOOS-3 b is a Earth-sized rocky planet orbiting the star SPECULOOS-3. Its year lasts 0.719 Earth days. It was discovered in 2024 by the Transit method.
| Host star | SPECULOOS-3 |
|---|---|
| Distance | 54.6 light-years (16.7 pc) |
| Orbital period | 17.3 hours |
| Orbital radius | 0.00733 AU |
| Radius | 0.977 R⊕ · 0.0872 R♃ |
| Mass | 0.894 M⊕ · 0.00281 M♃ (estimated from the radius) |
| Density | 5.27 g/cm³ |
| Equilibrium temperature | 553 K (280 °C) |
| Stellar flux received | 15.5 × Earth |
| Discovery method | Transit |
| Discovery year | 2024 |
| Discovered by | SPECULOOS Southern Observatory |
Habitable zone
Inside the inner edge of the habitable zone: it receives 15.5 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 8.9° across: 17 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 18.19. Visible from the whole Northern Hemisphere and south to latitude 56° S. North of latitude 56° N it never sets. It stands highest at midnight in August, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1971. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 969 thousand years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.