Luminosity of Stars Calculator

Luminosity is the total amount of energy emitted by a star, by a galaxy or other astronomical object per unit time. Luminosity is measured in joules per second or watts. Calculate the actual luminosity (brightness) of a star using our online luminosity of stars calculator with the known values of a distance of the star in meters and brightness in watts.


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The Lifetime of stars depends on the luminosity of stars. The absolute magnitude of a star is a simple way of describing its luminosity. Use our online luminosity of stars calculator to determine the amount of energy radiated by a star.