Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009iau...261.1002i&link_type=abstract
American Astronomical Society, IAU Symposium #261. Relativity in Fundamental Astronomy: Dynamics, Reference Frames, and Data Ana
Astronomy and Astrophysics
Astronomy
Scientific paper
Solar system dynamics has provided most of the experimental foundation of general relativity. In turn, accurate models of the solar system rely upon general relativity, the only theory of gravity that has passed experimental tests. Planetary ephemerides are built using unit values for the post-Newtonian parameters β and γ, but one cannot rule out that future, accurate measurements will prove to be inconsistent with the theory. The parameter γ, which controls the curvature produced by a unit mass, has been very accurately determined in a radio propagation experiment carried out in 2002 with the spacecraft Cassini. The experimental setup entailed very accurate measurements of the spacecraft range rate across a solar conjunction using multifrequency microwave links for the cancellation of plasma noise. The Cassini experiment confines deviations from general relativity to a level smaller than 20 ppm. The peculiar characteristics of the mission and its unique radio system are currently exploited in an attempt to confirm or rule out the presence of anomalous accelerations acting on the spacecraft.
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