apparent magnitude

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Related to apparent magnitudes: Visual magnitude, absolute magnitudes

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.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The mean V-R colour index, (1) V-R= 0.34, was used to estimate corresponding V-band apparent magnitudes (the small colour variation (3)--up to 0.035 in B-R--can be ignored here).
A star's apparent magnitude, or its brightness as seen from Earth, depends on its temperature, size, and distance from Earth.
But spherical figures are different from the other figures in this respect: among figures indistinguishable from a given visible figure, spherical figures alone have their real angle magnitudes equal to the apparent magnitudes of the angles in the visible figure.
COMPUTE IT YOURSELF Here are the formulas to find any object's actual size, and the apparent magnitude of any star, at any distance.
Then he plotted the stars' apparent magnitudes against their colors.
Stock said that most of them "do not show a conspicuous concentration of stars, the presence of a cluster being indicated only by the presence of stars of similar spectral types and apparent magnitudes."
The color index is the difference between a star's apparent magnitudes at two wavelengths.
Some of the objects mentioned above--tiny M76 or the individual stars within M5 and M13--have low total brightnesses (that is, numerically large apparent magnitudes) but high surface brightnesses, or brightnesses per unit area on the dome of the sky.
This indicated that stars of very different apparent magnitudes often lie at the same distance from us, and thus stars did not all have the same true brightness.
Their apparent magnitudes are also much alike, +0.4 and +0.8, respectively, for they are at similar distances; Procyon is 11.4 light-years away and Altair 16.6, making them the third and fourth closest of the 1st-magnitude or brighter stars (after Alpha Centauri and Sirius).
Up to now we've been dealing only with apparent magnitudes - how bright things look from Earth.
A large, dark asteroid and a small, highly reflective one might have identical apparent magnitudes, but their thermal properties will be quite different.