astrometric binary
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Related to astrometric binary: Binary stars
astrometric binary
n.
A binary star system in which the primary, or brightest, star is directly observable and has periodic changes in its position indicating the gravitational influence of an orbiting secondary star that is not directly observable.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.