About this world
HD 158038 b is a gas giant orbiting HD 158038, a giant star (type K0) 309 light-years from Earth. It is about 1.2 times the size of Jupiter (its size estimated from its mass), with at least 1.5 Jupiter masses (a minimum, measured by radial velocity). It completes an orbit every 521 days at 1.5 AU from its star, on a strongly elongated orbit (e = 0.29).
Its equilibrium temperature is about 406 K (133 °C): far too hot 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 W. M. Keck Observatory. The star wobbles toward and away from us, Doppler-shifting its spectrum.