Calculateur de Luminosité — 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).
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).
- L = 4π d² F
- d² = (1.496e11)² = 2.238e22
- 4π d² = 2.812e23 m²
- L = 2.812e23 × 1361 = 3.827e26 W ≈ 1.0 L_sun