Exoplanet · mini-Neptune
K2-172 c
K2-172 c is a mini-Neptune orbiting the star K2-172. Its year lasts 29.6 Earth days. It was discovered in 2018 by the Transit method.
| Host star | K2-172 |
|---|---|
| Distance | 814.6 light-years (249.7 pc) |
| Orbital period | 29.6 days |
| Radius | 3.21 R⊕ · 0.286 R♃ |
| Mass | 10.4 M⊕ · 0.0327 M♃ (estimated from the radius) |
| Density | 1.73 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 12.50. Visible from the whole Southern Hemisphere and north to latitude 77° N. South of latitude 77° S 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 1211. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 14 million years.
Planets in the same system
- K2-172 b 14.3-day orbit · 1.67 R⊕
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.