apparent magnitude

(redirected from Visual brightness)
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apparent 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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apparent magnitude

See magnitude.

apparent magnitude

[ə′pa·rənt ′mag·nə‚tüd]
(astronomy)
An index of a star's brightness relative to that of the other stars; it does not take into account the difference in distance between the stars and is not an indication of the star's true luminosity.
References in periodicals archive ?
Although its visual brightness normally varies by a factor of 140, the star's actual energy output only varies by a factor of two.
Peltier was known for his observations of variable stars, making some 132,000 visual brightness estimates, and for his discovery of a dozen comets and two novae.
FU Orionis eruptions typically last many decades and may occur repeatedly in a given star, increasing its visual brightness by up to five or six magnitudes.
To monitor Algol more closely, make a visual brightness estimate every half hour for as many hours as possible spanning a predicted eclipse.
That same morning Marvin Baldwin of Columbus, Indiana, estimated the star's visual brightness to be holding steady at 8th magnitude.