About this world
HD 27894 b is a gas giant orbiting HD 27894, an orange dwarf (type K2V) 143 light-years from Earth. It is about 1.3 times the size of Jupiter (its size estimated from its mass), with at least 0.62 Jupiter masses (a minimum, measured by radial velocity). It completes an orbit every 18 days at 0.13 AU from its star, closer than Mercury is to the Sun.
Its equilibrium temperature is about 628 K (355 °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 2005 by radial velocity with La Silla Observatory. The star wobbles toward and away from us, Doppler-shifting its spectrum. HD 27894 has 3 known planets; the others are HD 27894 c and HD 27894 d.