Exoplanet · mini-Neptune
Kepler-281 b
Kepler-281 b is a mini-Neptune orbiting the star Kepler-281. Its year lasts 14.6 Earth days. It was discovered in 2014 by the Transit method.
| Host star | Kepler-281 |
|---|---|
| Distance | 5,693 light-years (1,745 pc) |
| Orbital period | 14.6 days |
| Orbital radius | 0.117 AU |
| Eccentricity | 0.000 |
| Radius | 2.82 R⊕ · 0.252 R♃ |
| Mass | 324 M⊕ · 1.02 M♃ |
| Density | 52 g/cm³ |
| Surface gravity | 40.7 × Earth |
| Equilibrium temperature | 694 K (421 °C) |
| Stellar flux received | 118 × Earth |
| Discovery method | Transit |
| Discovery year | 2014 |
| Discovered by | Kepler |
Habitable zone
Inside the inner edge of the habitable zone: it receives 118 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 4.1° across: 7.7 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 15.93. Visible from the whole Northern Hemisphere and south to latitude 45° S. North of latitude 45° 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 5,693 years ago. At that time the first farming villages were being founded; there was no writing yet. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 101 million years.
Planets in the same system
- Kepler-281 c 36.3-day orbit · 5.31 R⊕
- Kepler-281 d 148-day orbit · 5.94 R⊕
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.