User:Kepler-1229b/Kepler-18c

Kepler-18c is an exoplanet that orbits Kepler-18, a star a bit bigger but less massive than the Sun, with a metallicity comparable but more than twice as old, situated around 1430 ly in the constellation of Cygnus. A planetary system made up of three bodies detected around this star on October 4, 2011 by the transit method using the Kepler space telescope.

Kepler-18c is a hot Neptune with a mass of 17.3 Earth masses, with a radius of 5.5 Earth radii and a low density of 0.6 g/cm-3.

It orbits in slightly more than 7.6 days at a distance of 0.075 AU, hence a surface equilibrium temperature of 635 °C.