Exoplanet · gas giant
CoRoT-21 b
CoRoT-21 b is a gas giant orbiting the star CoRoT-21. Its year lasts 2.72 Earth days. It was discovered in 2012 by the Transit method.
| Host star | CoRoT-21 |
|---|---|
| Distance | 4,562 light-years (1,399 pc) |
| Orbital period | 2.72 days |
| Orbital radius | 0.0417 AU |
| Eccentricity | 0.000 |
| Radius | 14.6 R⊕ · 1.3 R♃ |
| Mass | 718 M⊕ · 2.26 M♃ |
| Density | 1.36 g/cm³ |
| Surface gravity | 3.38 × Earth |
| Equilibrium temperature | 2,044 K (1,771 °C) |
| Stellar flux received | 2,920 × Earth |
| Discovery method | Transit |
| Discovery year | 2012 |
| Discovered by | CoRoT |
Habitable zone
Inside the inner edge of the habitable zone: it receives 2,920 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 25° across: 46 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 16.06. Visible from the whole Southern Hemisphere and north to latitude 90° N. It stands highest at midnight in December, the best time to observe it.
Light's journey
The light you see tonight set out 4,562 years ago. At that time the first farming villages were being founded; there was no writing yet. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 81 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.