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Separation of Relativity Effects and Effects due to a Quadrupole Moment of the Sun in Time-Delay Measurements
Phys. Rev. D 2, 2743 – Published 15 December, 1970
DOI: https://doi.org/10.1103/PhysRevD.2.2743
Abstract
The general-relativistic corrections and the effects due to a quadrupole moment of the Sun in measurements of the travel time of electromagnetic signals sent from Earth to artificial planets on circular and coplanar orbits are considered. It is found that a relativistic correction due to a term in the metric of second order in the mass of the Sun could not be separated from the effect due to a quadrupole moment unless additional information were available. The use of previous optical determinations of the motion of the node and perihelion of Mercury is considered and seen as adequate for a separation of the two effects to an accuracy of a few percent of the relativistic "nonlinear" effect.
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