绝对星等计算器 — 公式
## Absolute Magnitude
Absolute magnitude (M) is the apparent magnitude a star would have at a standard distance of 10 parsecs.
### Formula
**M = m - 5 log10(d / 10)**
This removes the effect of distance, allowing direct comparison of intrinsic brightnesses.
Absolute magnitude (M) is the apparent magnitude a star would have at a standard distance of 10 parsecs.
### Formula
**M = m - 5 log10(d / 10)**
This removes the effect of distance, allowing direct comparison of intrinsic brightnesses.
计算示例
Sirius: m = -1.46 at d = 2.64 pc.
- M = m - 5 log10(d/10)
- log10(2.64/10) = log10(0.264) = -0.578
- M = -1.46 - 5 × (-0.578) = -1.46 + 2.89 = 1.43
- Sirius has absolute magnitude ≈1.43.