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
A 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.
His research has been on astrometry, i.e. the measurement of positions, motions and distances of stars., and since 1960 he has developed photoelectric astrometry.
He designed the ESA satellite Hipparcos in 1975, and proposed in 1981 a new experiment on Hipparcos resulting in the Tycho-2 Catalogue of the 2.5 million brightest stars. In 1992 he proposed a new satellite Roemer, where the use of CCDs meant 100,000 times higher efficiency than with Hipparcos. This resulted in the adoption of a new ESA satellite, Gaia, to be launched in 2012.