Definitions for absolute magnitude

This page provides all possible meanings and translations of the word absolute magnitude

Random House Webster's College Dictionary

ab′solute mag′nitude(n.)

  1. the magnitude of a star as it would appear to a hypothetical observer at a distance of 10 parsecs or 32.6 light-years.

    Category: Astronomy

Origin of absolute magnitude:


Princeton's WordNet

  1. absolute magnitude(noun)

    (astronomy) the magnitude that a star would have if it were viewed from a distance of 10 parsecs (32.62 light years) from the earth


  1. absolute magnitude(Noun)

    The intrinsic luminosity,x that a celestial body would have if viewed from a distance of 10 parsecs.


  1. Absolute magnitude

    Absolute magnitude is the measure of a celestial object's intrinsic brightness. It is the apparent magnitude an object would have if it were at a standard luminosity distance away from the observer, in the absence of astronomical extinction. It allows the true brightnesses of objects to be compared without regard to distance. Bolometric magnitude is luminosity expressed in magnitude units; it takes into account energy radiated at all wavelengths, whether observed or not. The absolute magnitude uses the same convention as the visual magnitude: a factor of 100.4 ratio of brightness corresponds to a difference of 1.0 in magnitude. The Milky Way, for example, has an absolute magnitude of about −20.5. So a quasar at an absolute magnitude of −25.5 is 100 times brighter than our galaxy. If this particular quasar and our galaxy could be seen side by side at the same distance, the quasar would be 5 magnitudes brighter than our galaxy.


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