Exoplanet · super-Earth
K2-339 b
K2-339 b is a super-Earth orbiting the star K2-339. Its year lasts 19.5 Earth days. It was discovered in 2021 by the Transit method.
| Host star | K2-339 |
|---|---|
| Distance | 1,175 light-years (360.4 pc) |
| Orbital period | 19.5 days |
| Radius | 1.92 R⊕ · 0.171 R♃ |
| Mass | 4.35 M⊕ · 0.0137 M♃ (estimated from the radius) |
| Density | 3.38 g/cm³ |
| Equilibrium temperature | 508 K (235 °C) |
| Discovery method | Transit |
| Discovery year | 2021 |
| Discovered by | K2 |
In the sky
A telescope is needed to see it: its apparent magnitude is 14.49. Visible from the whole Northern Hemisphere and south to latitude 71° S. North of latitude 71° N it never sets. It stands highest at midnight in January, the best time to observe it.
Light's journey
The light you see tonight set out around the year 851. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 21 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.