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Proceedings Paper

Chromatic Aberration Of An All-Reflective Telescope
Author(s): J Y Le Gall; M Saisse
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Paper Abstract

The satellite HIPPARCOS of the European Space Agency aims to build a catalog of the astro-metric 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 dependency of the diffraction. This effect, which occurs even when the system is all-reflective (and so when there is not classical chromatism) has been called "CHROMATICITY". The theoretical reasons of this aberration are explained and numerical values of the HIPPARCOS telescope CHROMATICITY are computed ; the accuracy of the results is then discussed.

Paper Details

Date Published: 9 January 1984
PDF: 8 pages
Proc. SPIE 0445, Instrumentation in Astronomy V, (9 January 1984); doi: 10.1117/12.966182
Show Author Affiliations
J Y Le Gall, Laboratoire d'Astronomie Spatiale (France)
M Saisse, Laboratoire d'Astronomie Spatiale (France)

Published in SPIE Proceedings Vol. 0445:
Instrumentation in Astronomy V
Alec Boksenberg; David L. Crawford, Editor(s)

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