A binary star system in which one companion is invisible, but is known to be present from its effect on measurements relating to the other.
- As technology has improved over time, a number of binaries originally identified as astrometric binaries have been upgraded to visual binary because of the sighting of the secondary in the system.
- About a hundred astrometric binary candidates have been discovered by Hipparcos.
- Thus Sirius was originally an astrometric binary, but is now a visual binary.
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Syllabification: as·tro·met·ric bi·na·ry
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