光度计算器
使用此光度计算器快速获得准确的计算结果。
W/m²
m
光度
382,764,080,942,341,600,000,000,000.000 W
以太阳光度计0.9999 L_sun
Luminosity vs Observed Flux
公式
## 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).
计算示例
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
常见问题
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.