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magnitude

World Encyclopedia | Date: 2005

magnitude In astronomy, numerical value expressing the brightness of a celestial object on a logarithmic scale. Apparent magnitude is the magnitude as seen from Earth, determined by eye, photographically or photometrically. It ranges from positive through zero to negative values, the brightness increasing as the magnitude decreases. Absolute magnitude indicates intrinsic luminosity, and is defined as the apparent magnitude of an object at a distance of 10 parsecs from the object.

Â© World Encyclopedia 2005, originally published by Oxford University Press 2005.

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