距离模数计算器
使用此距离模数计算器快速获得准确的计算结果。
距离
206.06 pc
Distance Modulus (m - M)6.57 mag
Distance (ly)672.09 ly
Distance vs Apparent Magnitude (m)
公式
## Distance Modulus The distance modulus (m - M) connects apparent and absolute magnitudes to distance. ### Formula **d = 10^((m - M + 5) / 5)** parsecs This is the inverse of the magnitude-distance relation and is fundamental to the cosmic distance ladder.
计算示例
A Cepheid variable has m = 1.43 and M = -5.14.
- 01Distance modulus = m - M = 1.43 - (-5.14) = 6.57
- 02d = 10^((6.57 + 5)/5) = 10^(11.57/5) = 10^2.314
- 03d ≈ 206 pc ≈ 672 ly
常见问题
What is a standard candle?
An object with a known absolute magnitude (like a Type Ia supernova or Cepheid variable), allowing distance measurement via the distance modulus.
What distance modulus corresponds to 10 Mpc?
m - M = 5 log10(10^7/10) = 5 × 6 = 30. Such large moduli apply to distant galaxies.
Does interstellar dust affect this?
Yes. Dust dims light (extinction), making objects appear farther than they are. Corrections for reddening are essential.