photographic magnitude


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photographic 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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photographic magnitude

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

photographic magnitude

[¦fōd·ə¦graf·ik ′mag·nə‚tüd]
(astronomy)
The magnitude of a star, as obtained by measuring the apparent size of a star's image on a photographic emulsion sensitive to blue light at wavelengths between 400 and 500 nanometers.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
This paradox disappears when one realizes that the planetary's photographic magnitude of 12.2 is often cited.
(There is an excellent discussion of limiting photographic magnitude under various conditions in Patrick Martinez's Astrophotography II, published by Willmann-Bell and available from Sky Publishing Corp.)
The products were uniform series of photographic magnitudes and proper motions for the original 20 843 stars of the CAZ, published in 1936, and for 20 554 fainter ones published in 1941.

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