Exoplanet · super-Earth
K2-173 b
K2-173 b is a super-Earth orbiting the star K2-173. Its year lasts 5.87 Earth days. It was discovered in 2018 by the Transit method.
| Host star | K2-173 |
|---|---|
| Distance | 745.7 light-years (228.6 pc) |
| Orbital period | 5.87 days |
| Radius | 1.61 R⊕ · 0.143 R♃ |
| Mass | 3.22 M⊕ · 0.0101 M♃ (estimated from the radius) |
| Density | 4.25 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 12.52. Visible from the whole Northern Hemisphere and south to latitude 74° S. North of latitude 74° N it never sets. It stands highest at midnight in November, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1280. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 13 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.