plate constants

plate constants

[′plāt ‚kän·stəns]
(astronomy)
Coefficients that appear in linear equations used to derive the standard coordinates of the position of a star on a photographic plate from the measured coordinates of the star's image on the plate.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Slowly, over a span of six decades, about 150 volumes of data were published containing positional measurements of stars with respect to plate centers, as well as the plate constants and formulas required to convert the x, y measures to right ascension and declination.
Even when this was undertaken, the plate constants originally published did not yield the accuracy inherent in the plate measures themselves.
He calculated new plate constants free from many of the systematic errors in previous determinations.