About this world
HIP 91258 b is a gas giant orbiting HIP 91258, a yellow, Sun-like star (type G5V) 150 light-years from Earth. It is about 1.2 times the size of Jupiter (its size estimated from its mass), with at least 1.1 Jupiter masses (a minimum, measured by radial velocity). It completes an orbit every 5.05 days at 0.06 AU from its star, closer than Mercury is to the Sun.
Its equilibrium temperature is about 1,025 K (752 °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 2013 by radial velocity with Haute-Provence Observatory. The star wobbles toward and away from us, Doppler-shifting its spectrum.