Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2004-04-26
Gen.Rel.Grav. 37 (2005) 391-398
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
LaTex, 10 pages, 1 table, no figures. References added. Small changes in the Introduction. References updated. To appear in Ge
Scientific paper
10.1007/s10714-005-0026-y
The possibility of analyzing the node Omega of the GP-B satellite in order to measure also the Lense-Thirring effect on its orbit is examined. This feature is induced by the general relativistic gravitomagnetic component of the Earth gravitational field. The GP-B mission has been launched in April 2004 and is aimed mainly to the measurement of the gravitomagnetic precession of four gyroscopes carried onboard at a claimed accuracy of 1% or better. The aliasing effect of the solid Earth and ocean components of the solar K_1 tidal perturbations would make the measurement of the Lense-Thirring effect on the orbit unfeasible. Indeed, the science period of the GP-B mission amounts to almost one year. During this time span the Lense-Thirring shift on the GP-B node would be 164 milliarcseconds (mas), while the tidal perturbations on its node would have a period of the order of 10^3 years and amplitudes of the order of 10^5 mas.
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