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{{#invoke:Hatnote|hatnote}} Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993. It was the first space experiment devoted to precision astrometry, the accurate measurement of the positions of celestial objects on the sky.<ref name="GSM">{{#invoke:citation/CS1|citation |CitationClass=book }}</ref> This permitted the accurate determination of proper motions and parallaxes of stars, allowing a determination of their distance and tangential velocity. When combined with radial-velocity measurements from spectroscopy, this pinpointed all six quantities needed to determine the motion of stars. The resulting Hipparcos Catalogue, a high-precision catalogue of more than 118,200 stars, was published in 1997. The lower-precision Tycho Catalogue of more than a million stars was published at the same time, while the enhanced Tycho-2 Catalogue of 2.5 million stars was published in 2000. Hipparcos‍ '​ follow-up mission, Gaia, was launched in 2013.

The word "Hipparcos" is an acronym for High precision parallax collecting satellite and also a reference to the ancient Greek astronomer Hipparchus of Nicaea, who is noted for applications of trigonometry to astronomy and his discovery of the precession of the equinoxes.


Hipparcos sections
Intro   Background    Satellite and payload    Principles    Development, launch and operations    Hipparcos Input Catalogue    Data reductions    The Hipparcos reference frame    Double and multiple stars    Photometric observations    Radial velocities    Published catalogues    Scientific results    People    See also    References    External links   

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Journal::stars    Title::first    Volume::bibcode    Pages::space    Stellar::orbit    Issue::motion

{{#invoke:Hatnote|hatnote}} Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993. It was the first space experiment devoted to precision astrometry, the accurate measurement of the positions of celestial objects on the sky.<ref name="GSM">{{#invoke:citation/CS1|citation |CitationClass=book }}</ref> This permitted the accurate determination of proper motions and parallaxes of stars, allowing a determination of their distance and tangential velocity. When combined with radial-velocity measurements from spectroscopy, this pinpointed all six quantities needed to determine the motion of stars. The resulting Hipparcos Catalogue, a high-precision catalogue of more than 118,200 stars, was published in 1997. The lower-precision Tycho Catalogue of more than a million stars was published at the same time, while the enhanced Tycho-2 Catalogue of 2.5 million stars was published in 2000. Hipparcos‍ '​ follow-up mission, Gaia, was launched in 2013.

The word "Hipparcos" is an acronym for High precision parallax collecting satellite and also a reference to the ancient Greek astronomer Hipparchus of Nicaea, who is noted for applications of trigonometry to astronomy and his discovery of the precession of the equinoxes.


Hipparcos sections
Intro   Background    Satellite and payload    Principles    Development, launch and operations    Hipparcos Input Catalogue    Data reductions    The Hipparcos reference frame    Double and multiple stars    Photometric observations    Radial velocities    Published catalogues    Scientific results    People    See also    References    External links   

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