– Niels Bohr Institute - University of Copenhagen

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Niels Bohr Institute > Who, What, When > > Surveying the sky

Danish astrometry from 1925 to today

Surveying the sky

An astrometric experiment in 1925 was the beginning of a development, which astronomer Erik Høg at the Niels Bohr Institute further developed from 1960. He devised a new method for accurate measurement of the stars in the sky that led ESA to launch the first major astrometry satellite Hipparcos in 1989. A scientific highlight is the star catalogue Tycho-2 from the year 2000, which describes the positions and movements of 2.5 million stars and is now absolutely essential to controlling satellites and for astronomical observations.

23 November 2010

En epoke over 400 årA 400 year era
Our most famous astronomer, Tycho Brahe was directly under the king, who let him build an observatory on the island Hven in Øresund.

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23 November 2010

AstrometriAstrometry
Astrometry is the branch of astronomy that Tycho Brahe practised by measuring the position of stars.

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23 November 2010

Udvikling af fotoelektrisk astrometriDevelopment of photoelectric astrometry
Erik Høg, an astronomer at the University of Copenhagen, worked for 15 years at the observatory in Hamburg.

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23 November 2010

Astrometri i rummetAstrometry in space
In 1975 ESA asked Erik Høg whether he would take part in the development of a satellite for astrometry.

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23 June 2010

Gaia - et kvantespring for astrometrienThe Gaia Mission - a new tiger leap in astrometry
The first satellite, Hipparcos brought a tiger leap for astrometry. Next big leap was the Gaia satellite, which is a million times more efficient

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