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Cited by 8 publications
(3 citation statements)
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“…In addition, the Hipparcos Star Mapper provided measurements which lead to the Tycho and Tycho-2 catalogues (ESA 1997, Hoeg et al 2000, containing astrometric and photometric (B T and V T ) measurements for 1 and 2.5 million stars, respectively. As expected, the Tycho epoch photometry in B T and V T has been more difficult to handle than the main mission photometry in the Hp band, and led to a relatively low number of variable stars, see Piquard et al (2001). Ten years after the publication of the Hipparcos catalogue, a new reduction of the astrometric data has been undertaken and published (van Leeuwen 2007).…”
Section: Hipparcosmentioning
confidence: 91%
See 1 more Smart Citation
“…In addition, the Hipparcos Star Mapper provided measurements which lead to the Tycho and Tycho-2 catalogues (ESA 1997, Hoeg et al 2000, containing astrometric and photometric (B T and V T ) measurements for 1 and 2.5 million stars, respectively. As expected, the Tycho epoch photometry in B T and V T has been more difficult to handle than the main mission photometry in the Hp band, and led to a relatively low number of variable stars, see Piquard et al (2001). Ten years after the publication of the Hipparcos catalogue, a new reduction of the astrometric data has been undertaken and published (van Leeuwen 2007).…”
Section: Hipparcosmentioning
confidence: 91%
“…The project scientist of Hipparcos, Michael Perryman, wrote two books (Perryman 2009, Perryman 2010). The first book summarizes and highlights the scientific harvest of Hipparcos during the 10 years following the catalogue publication.…”
Section: Hipparcosmentioning
confidence: 99%
“…By this time, as Perryman states, the Royal Greenwich Observatory had been founded in England "with the purpose of compiling detailed star maps for navigational purposes." 4 There was another important scientific reason behind the study of the heavens: to measure time to know the longitude coordinate when navigating, as noted by Whitfield and Sobel. 5 Currently, historical celestial cartographic resources are still used for research.…”
Section: The Importance Of the Astronomical Resourcesmentioning
confidence: 99%