Relative Temperature from Relative size and luminosity

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

INSTRUCTIONS: Enter the following:

• (L)  This is the relative luminosity.
• (R)  This is the relative size (radius).

Relative Stellar Temperature: The calculator returns the relative temperature.

The Math / Science

A stars temperature can be determined if you know the relative size and luminosity compared to the Sun. Suppose a star is twice the size of the sun with 10 times the luminosity? Use: R=2 and L=10 to find:

T=(10/2^2)^(0.25)

Astronomy Calculators

• Kepler's 3^rd Law formula T² = (4π • R³)/(G • M)
  • (M) - mass of the system. 
  • (T) - period of the orbit.
  • (R) - separation distance between the two objects.
  • (G) - universal gravity constant
• Small Angle Formula
  • (α) - angle
  • (D) - distance to astronomical object
  • (S) - size or diameter of astronomical object
• Flux and Magnitude formulas
  • Change in Magnitude from Flux Ratio
  • Flux Ratio from Magnitudes
• Telescope formulas
  • Resolving Power of a Telescope
  • Magnification of a Telescope
• Mass formulas
  • Mass from Luminosity
  • Mass from Acceleration and Radius
  • Mass from Speed and Separation
  • Mass of extra-solar planet from mass of star, radius of star orbit and radius of exoplanet orbit
  • Mass of extra-solar planet from mass and velocity of star and velocity of planet
• Relative Size Formulas
  • Relative Size from Relative Temperature and Luminosity
  • Relative Temperature from Relative Size and Luminosity
  • Relative Luminosity from Relative Temperature and Size
• Wavelength Formulas
  • Velocity from shift in Wavelength and Unshifted Wavelength
  • Wavelength Shift from Wavelength and Speed
  • Blackbody Wavelength from Temperature
  • Blackbody Temperature from Peak Wavelength
  • Photon Energy from Wavelength
  • Photon Wavelength from Energy
• Luminosity and other Formulas
  • Distance from absolute and apparent magnitude
  • Radius from Speed and Period
  • Speed of Circular Motion
  • Hubble Time
  • Luminosity from Mass

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• Kepler's 3^rd Law Calc has Kepler's 3^rd law solved for each parameter.
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• 3D Vector Calculator:
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• Exoplanet Calculator contains formulas for studying planets outside of our Solar System.
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• Radius of Perigee
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