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`L = R^2 * T^4`

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The **Relative Luminosity from Relative Size and Temperature** calculator computes the relative luminosity based on the relative size and the relative temperature.

**INSTRUCTIONS:** Enter the following:

- (
**T**) This is the Relative Temperature. It is the absolute temperature divided by the temperature of the reference object. - (
**R**) This is the Relative Size. It is the radius divided by the radius of the reference object.

**Relative Luminosity:** The calculator returns the relative luminosity (**L**)

The formula for the relative luminosity of a star based on the relative temperature and size is:

L = R^{2}•T^{4}

where:

- L = Relative luminosity
- R = Relative Size
- T = Relative Temperature

For example, suppose you have a star with 10 times the radius of the Sun but half the absolute temperature. The luminosity of this star would be:

L = 10^{2} • (0.5)^{4}

or 6.25 times the luminosity of the Sun.

- Kepler's 3
^{rd}Law formula T² = (4π • R³)/(G • M) - Small Angle Formula
- Flux and Magnitude formulas
- Telescope formulas
- Mass formulas
- Relative Size Formulas
- Wavelength Formulas
- Luminosity and other Formulas

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