Exoplanet · mini-Neptune
K2-340 b
K2-340 b is a mini-Neptune orbiting the star K2-340. Its year lasts 29.7 Earth days. It was discovered in 2021 by the Transit method.
| Host star | K2-340 |
|---|---|
| Distance | 2,408 light-years (738.1 pc) |
| Orbital period | 29.7 days |
| Radius | 3.36 R⊕ · 0.3 R♃ |
| Mass | 11.2 M⊕ · 0.0352 M♃ (estimated from the radius) |
| Density | 1.62 g/cm³ |
| Equilibrium temperature | 606 K (333 °C) |
| Discovery method | Transit |
| Discovery year | 2021 |
| Discovered by | K2 |
In the sky
A telescope is needed to see it: its apparent magnitude is 14.43. 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 383 BC. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 43 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.