X-Nico

Planetary equilibrium temperature

$P=\backslash sigma\; A\; \{\; T\; \}^\{\; 4\; \}$ Any incoming power to a black body is radiated as heat according to the Stefan–Boltzmann law, where P is the incoming power, σ is the Stefan–Boltzmann constant, A is the surface area of the black body, and T is the equilibrium temperature.

see also