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Reference frames, gauge transformations and gravitomagnetism in the post-Newtonian theory of the lunar motion

Published online by Cambridge University Press:  06 January 2010

Yi Xie  and
Sergei Kopeikin
Yi Xie
Affiliation:
Astronomy Department, Nanjing University, Nanjing, Jiangsu 210093, China Department of Physics & Astronomy, University of Missouri-Columbia, Columbia, MO 65211, USA
Sergei Kopeikin*
Affiliation:
Department of Physics & Astronomy, University of Missouri-Columbia, Columbia, MO 65211, USA
*
†email: kopeikins@missouri.edu
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Abstract

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We construct a set of reference frames for description of the orbital and rotational motion of the Moon. We use a scalar-tensor theory of gravity depending on two parameters of the parametrized post-Newtonian (PPN) formalism and utilize the concepts of the relativistic resolutions on reference frames adopted by the International Astronomical Union in 2000. We assume that the solar system is isolated and space-time is asymptotically flat. The primary reference frame has the origin at the solar-system barycenter (SSB) and spatial axes are going to infinity. The SSB frame is not rotating with respect to distant quasars. The secondary reference frame has the origin at the Earth-Moon barycenter (EMB). The EMB frame is local with its spatial axes spreading out to the orbits of Venus and Mars and not rotating dynamically in the sense that both the Coriolis and centripetal forces acting on a free-falling test particle, moving with respect to the EMB frame, are excluded. Two other local frames, the geocentric (GRF) and the selenocentric (SRF) frames, have the origin at the center of mass of the Earth and Moon respectively. They are both introduced in order to connect the coordinate description of the lunar motion, observer on the Earth, and a retro-reflector on the Moon to the observable quantities which are the proper time and the laser-ranging distance. We solve the gravity field equations and find the metric tensor and the scalar field in all frames. We also derive the post-Newtonian coordinate transformations between the frames and analyze the residual gauge freedom of the solutions of the field equations. We discuss the gravitomagnetic effects in the barycentric equations of the motion of the Moon and argue that they are beyond the current accuracy of lunar laser ranging (LLR) observations.

Keywords

gravitationrelativityastrometryreference systems
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S261: Relativity in Fundamental Astronomy: Dynamics, Reference Frames, and Data Analysis , April 2009 , pp. 40 - 44
Copyright
Copyright © International Astronomical Union 2010

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