# Caspius - Proxima Centauri b

CODEX Entry 3900: Caspius

Known on earth as Proxima Centauri b, and discovered in August 2016, 4.24 light years from Earth. The planet is orbiting Proxima Centauri at a distance of 7.5 million km, with an orbital period of approximately 11.2 Earth days. Its estimated mass is at least 1.3 times that of the Earth. The equilibrium temperature of Proxima b is estimated to be within the range of where water could exist as liquid on its surface. This is possible because, although Caspius is close to the star, Proxima Centauri is a red dwarf star, about an eighth of the size of the Sun.