About this world
HD 220773 b is a gas giant orbiting HD 220773, a yellow-white F-type star (type F9) 165 light-years from Earth. It is about 1.2 times the size of Jupiter (its size estimated from its mass), with at least 1.4 Jupiter masses (a minimum, measured by radial velocity). It completes an orbit every 10.2 years at 4.9 AU from its star, on a strongly elongated orbit (e = 0.51).
Its equilibrium temperature is about 167 K (−106 °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 2011 by radial velocity with McDonald Observatory. The star wobbles toward and away from us, Doppler-shifting its spectrum.