Kepler-87c

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. ^[1]

Kepler-87c

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 R🜨
Mass	6.4±0.8 M🜨
Mean density	0.152 g/cm3 (0.0055 lb/cu in)
Temperature	403 K (130 °C; 266 °F) [1]

Characteristics

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 makes it the first Super-puff, a planet with such low density. Its equilibrium temperature is 130 °C.^[2]