Calculateur de Magnitude Apparente Gratuit

Calculez la magnitude apparente d'un objet céleste.

pc

Apparent Magnitude

4.83 mag

Distance Modulus0.00 mag

Apparent Magnitude vs Absolute Magnitude (M)

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Formule

Apparent Magnitude

Apparent magnitude (m) is how bright a star appears from Earth.

Distance Modulus

m = M + 5 log10(d / 10)

  • *M* = absolute magnitude (brightness at 10 pc)
  • *d* = distance in parsecs

    • Lower magnitudes are brighter. Each magnitude step is a factor of ≈2.512 in brightness.

    Exemple Résolu

    The Sun has M = 4.83. How bright would it be at 10 pc?

    1. 01m = M + 5 log10(d/10)
    2. 02m = 4.83 + 5 log10(10/10)
    3. 03m = 4.83 + 5 × 0 = 4.83
    4. 04At 10 pc the Sun would be a modest naked-eye star.

    Questions Fréquentes

    What is the faintest magnitude visible to the naked eye?

    About +6.0 under perfect dark-sky conditions.

    Can apparent magnitude be negative?

    Yes. Very bright objects have negative magnitudes: Sirius is -1.46, the full Moon is -12.7, and the Sun is -26.7.

    What is a bolometric magnitude?

    It accounts for radiation across all wavelengths, not just visible light. Visual magnitude (V) only measures one band.

    Calculatrices Associées

    Absolute Magnitude Calculator

    Find intrinsic brightness from apparent magnitude and distance.

    Distance Modulus Calculator

    Find distance from the magnitude difference.

    Luminosity Calculator

    Calculate total power output of a star.