About this world
GJ 433 b is a sub-Neptune orbiting GJ 433, a cool red dwarf (type M2V) 29.6 light-years from Earth. It is about 2.3 times the size of Earth (its size estimated from its mass), with at least 6 Earth masses (a minimum, measured by radial velocity). It completes an orbit every 7.37 days at 0.062 AU from its star, closer than Mercury is to the Sun.
Its equilibrium temperature is about 474 K (201 °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 La Silla Observatory. The star wobbles toward and away from us, Doppler-shifting its spectrum. GJ 433 has 3 known planets; the others are GJ 433 d and GJ 433 c.