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I came upon http://arxiv.org/PS_cache/gr-qc/pdf/0104/0104064.pdf" [Broken] that describes the analysis of the anomalous acceleration of Pioneer 10 and 11, an unexplained perturbation of the trajectories of these spacecraft launched in the early 70's and observed during several decades.

After a first reading, I have already two questions:

Thanks,

Michel

After a first reading, I have already two questions:

- The equations (3) in the paper provides the system of differential equations that represents the motions of the planets as well as test bodies. It includes SR and GR corrections. First, I wonder how this equation can be derived, specially for the GR corrections. Any link to a readable derivation and comments on the meaning of each of these 10 and more terms in the rhs?

- Secondly, I would like to know how much this "experiment" can be considered as a test for the Equivalence Principle? At first sight it might be that it doesn't test the EP, since one given Pioneer probe is involved in each analysis. Nevertheless, the set of equations (3) somehow integrates the EP, since it is a full set of equations of motion. Therefore, maybe, the Pioneer data could also be relevant to checking the EP. Any idea?

Thanks,

Michel

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