photometric parallax


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photometric parallax

[¦fōd·ə¦me·trik ′par·ə‚laks]
(astronomy)
The annual parallax of a star too far away for its parallax to be measured directly, as calculated from its apparent magnitude and its absolute magnitude inferred from its spectral type.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.