Calculateur de Magnitude Absolue Gratuit
Calculez la magnitude absolue d'un objet céleste.
pc
Absolute Magnitude
1.43 mag
Absolute Magnitude vs Apparent Magnitude (m)
Formule
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.
Exemple Résolu
Sirius: m = -1.46 at d = 2.64 pc.
- 01M = m - 5 log10(d/10)
- 02log10(2.64/10) = log10(0.264) = -0.578
- 03M = -1.46 - 5 × (-0.578) = -1.46 + 2.89 = 1.43
- 04Sirius has absolute magnitude ≈1.43.
Questions Fréquentes
What is the Sun's absolute magnitude?
4.83 in the V-band. It is a fairly ordinary star in terms of intrinsic brightness.
What star has the lowest (brightest) absolute magnitude?
Extremely luminous stars like R136a1 have M around -8 to -9, outshining the Sun by millions of times.
Why 10 parsecs?
It was chosen as a convenient round number that puts most nearby stars at moderate magnitude values.