Luminosity Calculator

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Unit for the star's radius. Solar radii is most convenient for stellar comparisons.
The radius of the star. 1 solar radius = 695,700 km.
R☉
Unit for the star's effective surface temperature.
The effective surface (photospheric) temperature. The Sun's is about 5,778 K.
K
Unit for the star's distance from Earth. Leave distance blank to skip apparent magnitude.
Distance to the star. Used to compute apparent magnitude. At 10 pc, apparent magnitude equals absolute magnitude.
pc
LuminositySun-like (G/K-class)
1.0042L☉

Total power output relative to the Sun (1 L☉ = 3.828 × 10²⁶ W)

Luminosity (watts)3.844 × 10^26 WW
Absolute magnitude4.74
Apparent magnitude4.74
vs Sun ratio1.00× as luminous as the Sun
Temperature5,778K
4.74 mag
Supergiant<-5Giant / bright main sequence-5-2Sun-like2-6Dim main sequence6-12White dwarf12+

Luminosity: 1.00 L☉ (absolute magnitude 4.74)

  • This star radiates about 1.00 times as much energy as the Sun.
  • At 5778 K, this is a cool K- or M-type star. Even a large radius struggles to compensate for low temperature.
  • Absolute magnitude 4.74 means it would appear magnitude 4.74 from 10 parsecs (32.6 light-years).
  • Apparent magnitude 4.74 is visible to the naked eye from the given distance.

Next stepLuminosity tells you total power output; brightness as seen from Earth also depends on distance. Add a distance above to get the apparent magnitude.

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