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The Pioneer anomaly is a small sunward anomalous acceleration found in thetrajectory analysis of the Pioneer 10 and 11 spacecraft. As part of theinvestigation of the effect, analysis of recently recovered Doppler data forboth spacecraft has been completed. The presence of a small anomalousacceleration is confirmed using data spans more than twice as long as thosethat were previously analyzed. We examine the constancy and direction of thePioneer anomaly, and conclude that: i) the data favor a temporally decayinganomalous acceleration (~2\times 10^{-11} m/s^2/yr) with an over 10%improvement in the residuals compared to a constant acceleration model; ii)although the direction of the acceleration remains imprecisely determined, wefind no support in favor of a Sun-pointing direction over the Earth-pointing oralong the spin-axis directions, and iii) support for an early "onset" of theacceleration remains weak in the pre-Saturn Pioneer 11 tracking data. Wepresent these new findings and discuss their implications for the nature of thePioneer anomaly.

Support for temporally varying behavior of the Pioneer anomaly from the extended Pioneer 10 and 11 Doppler data sets