About this world
Kepler-30 d is a Neptune-like planet orbiting Kepler-30, a yellow, Sun-like star 2.98 thousand light-years from Earth. It is about 0.79 times the size of Jupiter and holds 0.073 Jupiter masses. It completes an orbit every 143 days at 0.5 AU from its star.
Its equilibrium temperature is about 308 K (35 °C): too cold for liquid water on its surface. At its size it almost certainly keeps a deep envelope of hydrogen and helium.
It was discovered in 2012 by transit with Kepler. A planet crosses its star and dims it by a tiny, periodic fraction. Kepler-30 has 3 known planets; the others are Kepler-30 b and Kepler-30 c.