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Comptes Rendus Physique
Volume 5, n° 8
pages 893-906 (octobre 2004)
Doi : 10.1016/j.crhy.2004.08.004
Metrology of angles in astronomy
Métrologie des angles en astronomie.
 

Jean Kovalevsky 1
Observatoire de la Côte dʼAzur, avenue Copernic, 06130 Grasse, France 

Abstract

In astronomy, measurements of angles play a major role. After defining the units in use in astronomy, three methods of measuring angles are presented, with an application to the transit instrument. The interferometric techniques for measuring large angles are described in optical and radio wavelengths. Due to the atmospheric and mechanical limitation on ground, space astrometry has multiple advantages. The satellite Hipparcos is described and the data reduction procedures and results obtained are sketched. In the future, two new astrometric space missions are approved: GAIA, based on Hipparcos principles and SIM, a space interferometer. They are described and the expected accuracies are presented. To cite this article: J. Kovalevsky, C. R. Physique 5 (2004).

The full text of this article is available in PDF format.
Résumé

En astronomie, les mesures angulaires jouent un grand rôle. Après avoir défini les unités en usage en astronomie, trois méthodes de mesure sont présentées, appliquées à lʼinstrument méridien. On décrit les techniques interférométriques pour mesurer les grands angles dans les domaines optiques et radio. Par suite des limitations dʼorigine atmosphérique ou mécanique de lʼastronomie au sol, lʼastrométrie spatiale présente de nombreux avantages. On donne un aperçu du satellite Hipparcos ainsi que des méthodes de réduction des données et des résultats obtenus. Dans lʼavenir, deux nouvelles missions spatiales astrométriques sont approuvées : GAIA, basé sur le principe dʼHipparcos et SIM, un interféromètre spatial. Elles sont décrites et lʼon présente les exactitudes attendues. Pour citer cet article : J. Kovalevsky, C. R. Physique 5 (2004).

The full text of this article is available in PDF format.

Keywords : Angles, Astronomy, Space, Interferometry

Mots-clés : Angles, Astrométrie, Espace, Interférométrie


1  Emeritus President of the CIPM.


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