Definition of astrometric binary in English:

astrometric binary


  • 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.

    • ‘About a hundred astrometric binary candidates have been discovered by Hipparcos.’
    • ‘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.’
    • ‘In astrometric binaries we see one star's position wobble periodically in response to the gravity of its unseen companion.’
    • ‘During the period 1950 to 1970, a number of stars, most notably Barnard's star, were claimed to be astrometric binaries with substellar companions.’
    • ‘Thus Sirius was originally an astrometric binary, but is now a visual binary.’


astrometric binary

/ˌastrōˈmetrik ˈbīnərē/