Exoplanet · gas giant
K2-99 b
K2-99 b is a gas giant orbiting the star K2-99. Its year lasts 18.2 Earth days. It was discovered in 2016 by the Transit method.
| Host star | K2-99 |
|---|---|
| Distance | 1,694 light-years (519.2 pc) |
| Orbital period | 18.2 days |
| Orbital radius | 0.153 AU |
| Eccentricity | 0.220 |
| Radius | 11.9 R⊕ · 1.06 R♃ |
| Mass | 277 M⊕ · 0.87 M♃ |
| Density | 0.9 g/cm³ |
| Surface gravity | 1.96 × Earth |
| Equilibrium temperature | 1,184 K (911 °C) |
| Stellar flux received | 357 × Earth |
| Discovery method | Transit |
| Discovery year | 2016 |
| Discovered by | K2 |
Habitable zone
Inside the inner edge of the habitable zone: it receives 357 times the light the Earth does, too hot to keep liquid water on its surface.
Its star in the sky
In the planet's sky its star is a disc 8.9° across: 17 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 11.22. Visible from the whole Southern Hemisphere and north to latitude 85° N. It stands highest at midnight in April, the best time to observe it.
Light's journey
The light you see tonight set out around the year 332. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 30 million years.
Planets in the same system
- K2-99 c 522-day orbit · 12.6 R⊕
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.