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Exoplanet List of exoplanets
Parent star
Star Kepler-87 (KOI 1574)
Constellation Cygnus
Right ascension (α) 19h 51m 40.05s
Declination (δ) +46° 57′ 54.5″
Apparent magnitude (mV) 14.6
Mass (m) 1.1 (±0.05) M
Radius (r) 1.82 (±0.04) R
Temperature (T) 5600 (± 50) K
Metallicity [Fe/H] −0.17 (± 0.03)
Age 7–8 Gyr
Physical characteristics
Mass(m)6.4±0.8 M
Radius(r)6.14±0.29 R
Density(ρ)0.152 g cm−3
Temperature (T) 400
Orbital elements
Semi-major axis(a) 0.664 AU
Eccentricity (e) 0.039
Orbital period(P) 191 d
Inclination (i) 89.588°
Discovery information
Discovery date 8 October 2013
Discoverer(s) Ofir et al.
Discovery method Transit (Kepler Mission)
Other detection methods Transit-timing variation
Discovery status Submitted
Other designations
KOI 1574.02

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.


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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