Astrometric Binary
A binary star identified by its irregular proper motion
Astronomical Unit (AU) ...
Astrometric binary
Ephemeris
Equatorium
Gaia Probe (ESA -- Planned for 2009-14)
Hipparcos Space Astrometry Mission (ESA -- 1989-93)
Spherical astronomy
Star cartography ...
astrometric binary A binary system in which the fainter member of the system is detected due to its gravitational effect on the proper motion of its brighter companion.
Astrometric Binary: It could happen that one star of the binary is not observable for some reason, but we could detect if the other star moves across the sky.
*Astrometric binary
*Hypothetical planet
*Interstellar planet
*List of stars with confirmed extrasolar planets
*List of extrasolar planet extremes
*Planetary habitability
*Planetary system
*PlanetQuest
*Pulsar planets
References ...
(b) In an astrometric binary system one sees only one star but its proper motion follows a curved path. (c) In a spectroscopic binary the stars are too close to be seen separately but changes in doppler shifts reveal the orbits.
[439] delta Aquilae, is a triple star system and an astrometric binary. Its primary star is a yellow-white F-type subgiant.
astrometric binary
astrometry
Astronomer Royal
astronomers and astrophysicists
Astronomical Almanac
astronomical catalogues
astronomical clock
astronomical constants
astronomical extinction
Astronomical Nulling Interferometer (ANI) ...
 See also: Star, Galaxy, Planet, Solar, Satellite
  
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