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Kinematical Relativistic Corrections for Earth’s Rotation Parameters

  • V.A. Brumberg (a1) and Pierre Bretagnon (a2)

Abstract

Dynamical theories of the Earth’s rotation like SMART97 (Bretagnon et al., 1998) are to be considered in a DGRS (dynamically nonrotating geocentric reference system) (Brumberg et al., 1996). Such a theory gives the explicit expressions in terms of TCG (Geocentric Coordinate Time) of three Euler angles relating a DGRS to the ITRS (International Terrestrial Reference System). These angular quantities together with their TCG derivatives enable one to get all Earth’s rotation parameters. At the same time, the analysis of observations result in the values for slightly different angles and their TCG derivatives characterizing the relationship between the ITRS and a KGRS (kinematically nonrotating geocentric reference system). The differences between these two sets of six quantities represent kinematical relativistic corrections (due to geodesic precession, geodesic nutation and luni-planetary terms). The paper presents these differences computed by means of the VSOP87 series (Bretagnon and Francou, 1988). In particular, in analysing observations at the microarcsecond level these expressions will permit an experimental check of geodesic precession in a more direct manner than it is done nowadays (Bertotti et al., 1987).

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References

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Bertotti, B., Ciufolini, I., and Bender, P.L., 1987, Phys. Rev. Lett, 58, 1062.
Bretagnon, P. and Francou, G., 1988, Astron. Astrophys., 202, 309.
Bretagnon, P., Rocher, P., and Simon, J.-L., 1997, Astron. Astrophys., 319, 305.
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Brumberg, V.A., 1995, J. of Geodynamics, 20, 181.
Brumberg, V.A., 1997a, in Dynamics and Astrometry of Natural and Artificial Celestial Bodies (IAU Colloquium No. 165, Poznan, 1996, eds. Wytrzyszczak, I.M., Lieske, J.H. and Feldman, R.A.), Kluwer, 439.
Brumberg, V.A., 1997b, Notes Sci. et Tech. du BDL, S057, Paris, 1.
Brumberg, V.A., Bretagnon, P., and Francou, G., 1992, Journées 1991, ed. Capitaine, N., Obs. de Paris, 141.
Brumberg, V.A., Bretagnon, P., and Guinot, B., 1996, Celest. Mech., 64, 231.
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Tisserand, F., 1891, Traité de Mécanique Céleste, Gauthier-Villars, Paris, t. II

Kinematical Relativistic Corrections for Earth’s Rotation Parameters

  • V.A. Brumberg (a1) and Pierre Bretagnon (a2)

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