Kepler-87c is a planet orbiting Kepler-87, a star slightly more massive than the Sun and nearing the end of its main-sequence period.
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| Discovery | |
|---|---|
| Discovered by | Ofir et al. |
| Discovery date | 8 October 2013 |
Detection method | Transit (Kepler Mission) |
| Orbital characteristics | |
Semi-major axis | 0.664 AU (99,300,000 km) |
| Eccentricity | 0.039 |
Orbital period (sidereal) | 191 d |
| Inclination | 89.588 |
| Star | Kepler-87 (KOI 1574) |
| Physical characteristics | |
Mean radius | 6.14±0.29 REarth |
| Mass | 6.4±0.8 MEarth |
Mean density | 0.152 g/cm3 (0.0055 lb/cu in) |
| Temperature | 400 |
Despite being larger than Neptune, Kepler-87c is only about 6.4 times more massive than Earth. This means that its density is only 0.152 g/cm3. This is the first planet with a comparable mass to have such a low density. Its equilibrium temperature is 130 °C.[1]
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