Geometrical stability and evolution of the HIPPARCOS telescope

Details Geometrical stability and evolution of the HIPPARCOS telescope Geometrical stability and evolution of the HIPPARCOS telescope

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...258...35l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 258, no. 1, p. 35-40.

Physics

Optics

7

Directional Stability, Drift (Instrumentation), Geometrical Optics, Hipparcos Satellite, Spaceborne Telescopes, Astrometry, Coordinate Transformations, Data Processing, Mathematical Models, Ray Tracing

Scientific paper

A simple geometrical model of the Hipparcos telescope is described whereby the relative positions and orientations of critical optical elements can be derived from the field-to-grid transformation determined as part of the normal data processing. The instrument is very stable on time scales of hours, but secular drifts of the order of 0.1 micron/d are observed, and there is evidence for a progressive deformation of the mirrors which may eventually also affect the image quality.

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