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Planet Equilibrium Temperature Calculator

Blackbody equilibrium T from star, distance, and albedo.

Compute a planet's blackbody equilibrium temperature T_eq = T_star · √(R_star / 2d) · (1 − A)^(¼) given the host-star temperature and radius, the orbital distance, and the planet's Bond albedo. Ignores greenhouse warming.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

K
km
AU

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

T_eq = T_star · √(R_star / 2d) · (1 − A)^(¼)

In depth

Compute a planet's blackbody equilibrium temperature T_eq = T_star · √(R_star / 2d) · (1 − A)^(¼) given the host-star temperature and radius, the orbital distance, and the planet's Bond albedo. Ignores greenhouse warming.