absolute magnitude

(redirected from Absolute brightness)
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absolute magnitude:

see magnitudemagnitude,
in astronomy, measure of the brightness of a star or other celestial object. The stars cataloged by Ptolemy (2d cent. A.D.), all visible with the unaided eye, were ranked on a brightness scale such that the brightest stars were of 1st magnitude and the dimmest stars
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absolute magnitude

See magnitude.

absolute magnitude

[′ab·sə‚lüt ′mag·nə·tüd]
(astrophysics)
A measure of the brightness of a star equal to the magnitude the star would have at a distance of 10 parsecs from the observer.
The stellar magnitude any meteor would have if placed in the observer's zenith at a height of 100 kilometers.
(mathematics)
The absolute value of a number or quantity.
References in periodicals archive ?
A large majority of the feline neurons tracked by Rossi's team showed the same electrical responses in the two trials to squares of equal perceived brightness, at least as judged by humans, rather than absolute brightness.
For instance, the shift from sunlight to shadow as the day progresses robs the world of absolute brightness, but contrasts of light to dark surfaces remain the same as dusk approaches, allowing individuals to maintain a constant perceptual portrait of their surroundings.
SDSS is systematically mapping a quarter of the entire sky to produce a detailed image of it and determine the positions and absolute brightness of more than 100 million celestial objects.