About this world
Kepler-68 d is a gas giant orbiting Kepler-68, a yellow, Sun-like star 470 light-years from Earth. It is about 1.2 times the size of Jupiter (its size estimated from its mass) and holds 0.84 Jupiter masses. It completes an orbit every 633 days at 1.5 AU from its star.
Its equilibrium temperature is about 261 K (−12 °C), which places it in the conservative habitable zone: the band where liquid water could exist on a rocky surface. At its size it almost certainly keeps a deep envelope of hydrogen and helium.
It was discovered in 2013 by radial velocity with W. M. Keck Observatory. The star wobbles toward and away from us, Doppler-shifting its spectrum. Kepler-68 has 4 known planets; the others are Kepler-68 b, Kepler-68 c and Kepler-68 e.