Exoplanet · mini-Neptune
K2-231 b
K2-231 b is a mini-Neptune orbiting the star K2-231. Its year lasts 13.8 Earth days. It was discovered in 2018 by the Transit method.
| Host star | K2-231 |
|---|---|
| Distance | 1,048 light-years (321.2 pc) |
| Orbital period | 13.8 days |
| Radius | 2.5 R⊕ · 0.223 R♃ |
| Mass | 6.8 M⊕ · 0.0214 M♃ (estimated from the radius) |
| Density | 2.39 g/cm³ |
| Discovery method | Transit |
| Discovery year | 2018 |
| Discovered by | K2 |
In the sky
A telescope is needed to see it: its apparent magnitude is 12.77. Visible from the whole Southern Hemisphere and north to latitude 74° N. South of latitude 74° S it never sets. It stands highest at midnight in July, the best time to observe it.
Light's journey
The light you see tonight set out around the year 978. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 19 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.