Exoplanet · super-Earth
Kepler-221 b
Kepler-221 b is a super-Earth orbiting the star Kepler-221. Its year lasts 2.8 Earth days. It was discovered in 2014 by the Transit method.
| Host star | Kepler-221 |
|---|---|
| Distance | 1,256 light-years (385.2 pc) |
| Orbital period | 2.8 days |
| Orbital radius | 0.037 AU |
| Eccentricity | 0.000 |
| Radius | 1.71 R⊕ · 0.153 R♃ |
| Mass | 5.96 M⊕ · 0.0187 M♃ |
| Density | 0.19 g/cm³ |
| Surface gravity | 2.04 × Earth |
| Equilibrium temperature | 1,090 K (817 °C) |
| Stellar flux received | 309 × Earth |
| Discovery method | Transit |
| Discovery year | 2014 |
| Discovered by | Kepler |
Habitable zone
Inside the inner edge of the habitable zone: it receives 309 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 12° across: 22 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 13.97. Visible from the whole Northern Hemisphere and south to latitude 43° S. North of latitude 43° 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 770. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 22 million years.
Planets in the same system
- Kepler-221 c 5.69-day orbit · 2.93 R⊕
- Kepler-221 d 10-day orbit · 2.73 R⊕
- Kepler-221 e 18.4-day orbit · 2.63 R⊕
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.