About this world
GJ 649 b is a gas giant orbiting GJ 649, a cool red dwarf (type M1.0) 33.9 light-years from Earth. It is about 0.96 times the size of Jupiter (its size estimated from its mass), with at least 0.26 Jupiter masses (a minimum, measured by radial velocity). It completes an orbit every 600 days at 1.1 AU from its star.
Its equilibrium temperature is about 121 K (−152 °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 2009 by radial velocity with W. M. Keck Observatory. The star wobbles toward and away from us, Doppler-shifting its spectrum.