The equilibrium temperature of proxima centauri b, calculated assuming zero albedo, no atmosphere, and efficient heat redistribution, is approximately 234 k (-39Β°c). In-deed, if proxima b has been able to keep a large enough water inventory, the steady release of geothermal heat entails a rise in temperature with depth through the ice cap. Proxima centauri, being a red dwarf, has a luminosity only 0. 15% of that emitted by the sun, and its effective temperature is 3050 k.

Proxima centauri b is an exoplanet orbiting within the habitable zone of the red dwarf star proxima centauri in the constellation centaurus. It can also be referred to as proxima b, [7] or alpha centauri Ò€¦