Chromatic aberration of an all-reflective telescope

Details Chromatic aberration of an all-reflective telescope Chromatic aberration of an all-reflective telescope

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984spie..445..497l&link_type=abstract

IN: Instrumentation in astronomy V; Proceedings of the Fifth Meeting, London, England, September 7-9, 1983 (A85-25360 10-89). Be

Astronomy and Astrophysics

Astronomy

Aberration, Photochromism, Reflecting Telescopes, Satellite Imagery, Spaceborne Telescopes, Astrometry, Design Analysis, Payloads, Schmidt Telescopes, Software Tools

Scientific paper

The satellite HIPPARCOS of the European Space Agency aims to build a catalog of the astrometric parameters of 100,000 stars. The satellite carries a special telescope which scans the sky; it images the stars on a modulating grid and the angular distance between two stars is deduced from the dephasage between the two modulated signals observed after the grid. The study showed an effect induced by the wavelength dependence of the diffraction. This effect, which occurs even when the system is all-reflective (and so when there is no classical chromatism) has been called 'chromaticity'. The theoretical reasons for this aberration are explained and numerical values of the HIPPARCOS telescope chromaticity are computed; the accuracy of the results is then discussed.

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