About this world
HD 220689 b is a gas giant orbiting HD 220689, a yellow, Sun-like star (type G3V) 153 light-years from Earth. It is about 1.2 times the size of Jupiter (its size estimated from its mass) and holds 1.2 Jupiter masses. It completes an orbit every 6.21 years at 3.4 AU from its star.
Its equilibrium temperature is about 160 K (−113 °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 radial velocity with La Silla Observatory. The star wobbles toward and away from us, Doppler-shifting its spectrum.