Relating the dynamical reference frame and the ephemerides to the ICRF

Details Relating the dynamical reference frame and the ephemerides to the ICRF Relating the dynamical reference frame and the ephemerides to the ICRF

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13q.609s&link_type=abstract

In: Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 J

Astronomy and Astrophysics

Astronomy

International Celestial Reference System

Scientific paper

JPL will continue its 30-year tradition of providing planetary and lunar ephemerides to the astronomical community and the ephemerides will continue to be based upon the PPN formulism of relativity with equations of motion correct and complete through order 1/c**2. The independent variable of the equations will continue to be ""Teph"" a relativistic coordinate time rigorously equivalent to the IAU's newly-defined quantity TCB but having the added benefit that |Teph-TT| < 2 milliseconds of time. The ephemerides have been oriented onto the ICRF (formerly the ""IERS reference frame"") since 1995. The orientation is now accurate to about 1 mas accomplished by the inclusion of VLBI observations of a number of spacecraft in orbit around Venus and Mars. Since the ICRF is assumed to be inertially founded the notion of a dynamical reference frame is no longer relevant.
The ephemerides also provide accurate coordinates of the earth about the sun from which the location of a ""mean ecliptic"" may be determined for use with other studies such as precession etc. The major uncertainty in the ephemerides of earth and Mars comes from the perturbations of many asteroids whose masses are not well-known.

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