Definition of astrometric binary in English:

astrometric binary

Line breaks: astro|metric bin¦ary

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.
    More 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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a small amount; a little