Effective Temperature

Symbol (Teff). [1]The temperature that a blackbody would have which emitted the same amount of energy per unit area as the star does: it is a temperature characteristic of the surface region.


  • The effective temperature of a star is the lowest temperature found at the top of the stellar atmosphere.[2]
  • The effective temperature of a planet is the heat it receives from a star at its location.[3]
  • The Kelvin scale is the principal temperature scale used in astronomy.
  • The effective temperature of a planet is not to be confused with its surface temperature.

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