Exoplanet · Neptune-like planet
Kepler-87 c
Kepler-87 c is a Neptune-like planet orbiting the star Kepler-87. Its year lasts 191 Earth days. It was discovered in 2013 by the Transit method.
| Host star | Kepler-87 |
|---|---|
| Distance | 4,021 light-years (1,233 pc) |
| Orbital period | 191 days |
| Orbital radius | 0.676 AU |
| Eccentricity | 0.039 |
| Radius | 6.14 R⊕ · 0.548 R♃ |
| Mass | 6.4 M⊕ · 0.0201 M♃ |
| Density | 0.152 g/cm³ |
| Surface gravity | 0.17 × Earth |
| Equilibrium temperature | 403 K (130 °C) |
| Stellar flux received | 4.66 × Earth |
| Discovery method | Transit |
| Discovery year | 2013 |
| Discovered by | Kepler |
Habitable zone
Inside the inner edge of the habitable zone: it receives 4.66 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 1.4° across: 2.7 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 14.68. 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 4,021 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 71 million years.
Planets in the same system
- Kepler-87 b 115-day orbit · 13.5 R⊕
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.