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New Time Scales: Removing Ambiguities

  • V.A. Brumberg (a1)

Extract

The new (1991) IAU recommendations on reference systems and time scales are based completely on general relativity. But the metric forms determining the corresponding reference systems are specified in these recommendations not sufficiently definitive to take into account non-geodesic accelerations in the motion of the geocentre or topocentre, to distinguish between relativistic dynamically or kinematically non-rotating systems and to exclude a possible ambiguity in the time scales due to the relativistic coordinate gauge. There is a hidden ambiguity in the relativistic definition of the geocentre due to the difference bewteen Newtonian-type and Blanchet-Damour multipole moments used, respectively, in Brumberg-Kopejkin (Brumberg and Kopejkin, 1989; Kopejkin, 1991a; Brumberg et al., 1993; Klioner, 1993; Klioner and Voinov, 1993) and Damour-Soffel-Xu (1991-1994) approach to construct relativistic hierarchy of reference systems. In using TAI as physical realization of TT one should specify the constant LG (Fukushima, 1994) once for ever not introducing the relativistic ill-defined notion of the geoid (Kopejkin, 1991b). It might be reasonable not to separate this constant at all (as having no sense for moving clocks on the surface of the Earth or in the circumterrestrial space) and to use TAIM as physical realization of TCG itself relating TCG directly with the observer’s proper time avoiding the intermediate scale TT (Brumberg, 1992).

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References

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Brumberg, V.A.: 1992, in: Bergeron, J. (ed.), Highlights on Astronomy, 9, 133
Brumberg, V.A. and Kopejkin, S.M.: 1989, in: Kovalevsky, J., Mueller, I.I. and Kolscsek, B. (eds.), Reference Frames, Kluwer, Dordrecht, 115
Brumberg, V.A., Bretagnon, P. and Francou, G.: 1993, A & A, 275, 651
Damour, T., Soffel, M. and Xu, C.: 1991, Phys. Ref. D, 43, 3273
Damour, T., Soffel, M. and Xu, C.: 1992, Phys. Ref. D, 45, 1017
Damour, T., Soffel, M. and Xu, C.: 1993, Phys. Ref. D, 47, 3124
Damour, T., Soffel, M. and Xu, C.: 1994, Phys. Ref. D, 49, 618
Fukuskima, T., in: Kinoshita, H. and Nakai, H. (eds.), Proc. 86th Symp. on Celestial Mechanics, NAO, Tokyo, 149
Klioner, S.A.: 1993, A & A, 279, 273
Klioner, S.A. and Voinov, A.V.: 1993, Phys. Ref. D, 48, 1451
Kopejkin, S.M.: 1991a, in Saskia, V. (ed.), Itogi Nauki i Tekhniki, Nauka, Moscow, 87
Kopejkin, S.M.: 1991b, Manuscripta Geodaetica, 16, 301

New Time Scales: Removing Ambiguities

  • V.A. Brumberg (a1)

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