Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009iau...261.0603p&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 EPM ephemerides of IAA RAS originated in seventies of the last century and have been developed since that time. These ephemerides are based upon relativistic equations of motion of astronomical bodies and light rays and upon relativistic time scales. Namely, a numerical integration of the equations of motion of celestial bodies has been performed in the Parameterized Post-Newtonian metric for General Relativity in the TDB time scale; the relativistic effects of the signal delay (the Shapiro effect), the deflection of light in a gravitational field and transition to the proper time are taken into account while processing observations.
The updated model of EPM2008 includes Eris and the other 20 largest trans-Neptunian objects in addition to the major planets, the Moon, the Sun, and the 301 biggest asteroids in a simultaneous numerical integration. The database, to which EPM2008 have been adjusted, includes recent spacecraft (Odyssey, MRO, VEX, Cassini) measurements and CCD data of the outer planets and their satellites, in addition to previous observations since 1913. These measurements (more 440000) are fit by the ephemerides of planets with milliarcsecond accuracy (except Pluto), and their orientation to the ICRF with the accuracy better than 0.001'. The real uncertainty of EPM ephemerides has been checked by comparison with the JPL's DE ephemerides. Some estimates of the relativistic parameters have been obtained: |1-β|<0.0002, |1-γ|<0.0002, |G&sun;/G|<5·10-13 in year. Corrections to the planet perihelion advances have been obtained with a good accuracy. The upper limit on mass of dark matter in the Solar System results from these corrections for the inner planets, and estimations for the outer planets test different alternative gravitational theories.
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