Relativistic Aspects of the JPL Planetary Ephemeris

Details Relativistic Aspects of the JPL Planetary Ephemeris Relativistic Aspects of the JPL Planetary Ephemeris

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009iau...261.0601f&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

The orbits of the planets as represented by the JPL planetary ephemerides are primarily now determined by radio tracking of spacecraft, with Earth-based astrometry now important mainly for Uranus, Neptune and Pluto. Analysis of the data and propagation of the orbits relies on an internally consistent set of equations of motion and propagation of radio signals including relativistic effects at the centimeter level. The planetary ephemeris data set can be used to test some aspects of the underlying theory such as estimates of PPN parameters gamma and beta, time variation in the gravitational constant G, rotation of the solar system relative to distant objects (Mach's principle), and place stringent limits on unmodeled accelerations on the planets (Pioneer anomaly). The current ephemeris modeling and data set will be described and current estimates of relativistic parameters presented.

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