Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988ruimt..37...15v&link_type=abstract
Ruimtevaart, vol. 37, April 1988, p. 15-19. In Dutch.
Astronomy and Astrophysics
Astronomy
European Space Programs, Hipparcos Satellite, Spaceborne Astronomy, Mission Planning, Satellite-Borne Instruments, Schmidt Telescopes
Scientific paper
An overview of the 2.5-year mission of the ESA Hipparcos astrometric satellite is given, and the contributions of the Technisch Physische Dienst (TPD) are discussed. The aim of the Hipparcos mission proper is to obtain the locations and proper motions of 100,000 stars to a limit of 13 mag in the 350-750-nm range and with accuracy (at 9 mag) of 2 marcsec in position and trigonometric parallax and 2 marcsec/yr in motion; the complementary Tycho mission involves BV photometry of 400,000 stars to 10-11 mag with accuracy 0.05 mag. The major payload component is a 290-mm-primary Schmidt telescope capable of observing two 0.9-deg-sq fields simultaneously. The TPD was responsible for the focal-plane grid assembly, the internal star-pattern assembly for the Tycho star mapper, and the refocusing mechanism. Photographs of these components are provided, and the problems posed by stray light are considered.
Bokhove Henk
van Agthoven H. J.
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