Definition of astrometric binary in English:

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astrometric binary

Pronunciation: /ˌastrōˈmetrik ˈbīnərē/

noun

Astronomy
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.
Example sentences
  • 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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