Calculateur de Luminosité
Calculez la luminosité d'une étoile en luminosités solaires.
Luminosité
382,764,080,942,341,600,000,000,000.000 W
Luminosity vs Observed Flux
Formule
## Luminosity from Flux and Distance Luminosity is the total power output of a star. If we measure the flux (power per unit area) at a known distance: **L = 4π d² F** The Sun's luminosity is 3.828 × 10²⁶ W, and its flux at 1 AU is about 1361 W/m² (the solar constant).
Exemple Résolu
The Sun: flux = 1361 W/m² at 1 AU (1.496e11 m).
- 01L = 4π d² F
- 02d² = (1.496e11)² = 2.238e22
- 034π d² = 2.812e23 m²
- 04L = 2.812e23 × 1361 = 3.827e26 W ≈ 1.0 L_sun
Questions Fréquentes
What is the solar luminosity?
3.828 × 10²⁶ watts. It is a standard unit for expressing other stars' luminosities.
How does luminosity differ from brightness?
Luminosity is an intrinsic property (total power). Brightness (flux) is what we measure, and it diminishes with distance.
What is the range of stellar luminosities?
From about 10⁻⁴ L_sun for the faintest red dwarfs to over 10⁶ L_sun for the most luminous supergiants.