Pioneer 10 Doppler data analysis: Disentangling periodic and secular anomalies |
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Authors: | A Levy B Christophe P Bério G Métris J-M Courty S Reynaud |
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Institution: | 1. ONERA/DMPH, 29 av. Division Leclerc, F-92322 Chatillon, France;2. Geoscience Azur, Université Nice Sophia-Antipolis, OCA, Avenue Copernic F-06130 Grasse, France;3. LKB, UPMC, Case 74, CNRS, ENS, F-75252 Paris cedex 05, France |
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Abstract: | This paper reports the results of an analysis of the Doppler tracking data of Pioneer probes which did show an anomalous behaviour. A software has been developed for the sake of performing a data analysis as independent as possible from that of Anderson et al. Anderson, J., Laing, P.A., Lau, E.L., Liu, A.S., Nieto, M.M., Turyshev, S.G. Study of the anomalous acceleration of Pioneer 10 and 11. Phys. Rev. D 65, 082004, 2002], using the same data set. A first output of this new analysis is a confirmation of the existence of a secular anomaly with an amplitude about 0.8 nm s−2 compatible with that reported by Anderson et al. A second output is the study of periodic variations of the anomaly, which we characterize as functions of the azimuthal angle φ defined by the directions Sun–Earth Antenna and Sun-Pioneer. An improved fit is obtained with periodic variations written as the sum of a secular acceleration and two sinusoids of the angles φ and 2φ. The tests which have been performed for assessing the robustness of these results are presented. |
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Keywords: | Pioneer anomaly Doppler tracking data Interplanetary trajectography |
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