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What (who) is run a temperature - definition
![The effective temperature of the [[Sun]] (5777 [[kelvin]]s) is the temperature a black body of the same size must have to yield the same total emissive power.](https://commons.wikimedia.org/wiki/Special:FilePath/EffectiveTemperature 300dpi e.png?width=200 "The effective temperature of the [[Sun]] (5777 [[kelvin]]s) is the temperature a black body of the same size must have to yield the same total emissive power.")
![[[Elizabeth Cronin]] (1879-1956)](https://commons.wikimedia.org/wiki/Special:FilePath/Image reproduced by permission of the National Folklore Collection, University Dublin.jpg?width=200 "[[Elizabeth Cronin]] (1879-1956)")
![[[Joseph Louis Gay-Lussac]]](https://commons.wikimedia.org/wiki/Special:FilePath/Gaylussac.jpg?width=200 "[[Joseph Louis Gay-Lussac]]")
![[[Guillaume Amontons]]](https://commons.wikimedia.org/wiki/Special:FilePath/Guillaume Amontons, wood cutting.png?width=200 "[[Guillaume Amontons]]")
![[[Johann Heinrich Lambert]]](https://commons.wikimedia.org/wiki/Special:FilePath/JHLambert.jpg?width=200 "[[Johann Heinrich Lambert]]")
![[[Jacques Alexandre César Charles]]](https://commons.wikimedia.org/wiki/Special:FilePath/Jacques Charles.jpg?width=200 "[[Jacques Alexandre César Charles]]")
![[[Macquorn Rankine]]](https://commons.wikimedia.org/wiki/Special:FilePath/Rankine William signature.jpg?width=200 "[[Macquorn Rankine]]")
Wikipedia
The effective temperature of a body such as a star or planet is the temperature of a black body that would emit the same total amount of electromagnetic radiation. Effective temperature is often used as an estimate of a body's surface temperature when the body's emissivity curve (as a function of wavelength) is not known.
When the star's or planet's net emissivity in the relevant wavelength band is less than unity (less than that of a black body), the actual temperature of the body will be higher than the effective temperature. The net emissivity may be low due to surface or atmospheric properties, including greenhouse effect.
