5 papers
Tidal dynamics of extended bodies in planetary systems and multiple stars
Stephane Mathis, Christophe Le Poncin-Lafitte
With the discovery during the past decade of a large number of extrasolar planets orbiting their parent stars at a distance lower than 0.1 astronomical unit (and the launch and the…
Angular distances in metric theories
Pierre Teyssandier, Christophe Le Poncin-Lafitte
The general expression of the angular distance between two point sources as measured by an arbitrary observer is given. The modelling presented here is rigorous, covariant and vali…
Radio and optical realizations of celestial reference frames
S. B. Lambert, S. Bouquillon, C. Le Poncin-Lafitte +2
The International Celestial Reference Frame (ICRF, Ma et al. 1998) is currently the best realization of a quasi-inertial reference system. It is based on more than 10 years of cumu…
Testing General Relativity with the ACES Mission
C. Le Poncin-Lafitte, S. Lambert
The new generation of atomic clocks will reach unprecedented uncertainties in frequency of . In order to prepare space missions such as ACES, we compute all relativistic…
Relativistic astrometry and Synge's world function
P. Teyssandier, C. Le Poncin-Lafitte
Almost all of the studies devoted to relativistic astrometry are based on the integration of the null geodesic differential equations. However, the gravitational deflection of ligh…