optical double star
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Related to optical double star: Binary star system
optical double star[′äp·tə·kəl ′dəb·əl ′stär]
Two stars not formally a physical system but that appear to be a typical double star; a false binary star whose components happen to lie nearby in the same line of sight.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.