Exoplanet · mini-Neptune
Kepler-338 b
Kepler-338 b is a mini-Neptune orbiting the star Kepler-338. Its year lasts 13.7 Earth days. It was discovered in 2014 by the Transit method.
| Host star | Kepler-338 |
|---|---|
| Distance | 1,803 light-years (552.8 pc) |
| Orbital period | 13.7 days |
| Orbital radius | 0.117 AU |
| Eccentricity | 0.040 |
| Radius | 2.44 R⊕ · 0.218 R♃ |
| Mass | 30.6 M⊕ · 0.0963 M♃ |
| Density | 11.6 g/cm³ |
| Surface gravity | 5.14 × Earth |
| Equilibrium temperature | 1,005 K (732 °C) |
| Stellar flux received | 257 × Earth |
| Discovery method | Transit |
| Discovery year | 2014 |
| Discovered by | Kepler |
Habitable zone
Inside the inner edge of the habitable zone: it receives 257 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 7.9° across: 15 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 12.27. Visible from the whole Northern Hemisphere and south to latitude 49° S. North of latitude 49° N 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 223. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 32 million years.
Planets in the same system
- Kepler-338 e 9.34-day orbit · 1.56 R⊕
- Kepler-338 c 24.3-day orbit · 2.34 R⊕
- Kepler-338 d 44.4-day orbit · 3 R⊕
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.