Influence of the multipole moments of a giant planet on the propagation of light: application to GAIA

Details Influence of the multipole moments of a giant planet on the propagation of light: application to GAIA Influence of the multipole moments of a giant planet on the propagation of light: application to GAIA

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jsrs.meet..204l&link_type=abstract

In: Journées 2004 - systèmes de référence spatio-temporels. Fundamental astronomy: new concepts and models for high accuracy obs

Astronomy and Astrophysics

Astronomy

3

Gaia, Space Astrometry

Scientific paper

Approved space astrometry missions, like GAIA and SIM, are aimed to measure positions and/or parallaxes of celestial objects with an accuracy of 1-10 microarcseconds (μas). At such a level of accuracy, it will be indispensable to take into account the influence of the multipole structure of the giant planets (mainly Jupiter and Saturn) on the gravitational light deflection. Using the Nordtvedt-Will parametrized post-Newtonian formalism, we present an algorithmic procedure enabling to determine this influence on a light ray connecting two points located at a finite distance.

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