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Analysis of the radio tracking data from the Pioneer 10/11 spacecraft atdistances between about 20 - 70 AU from the Sun has consistently indicated thepresence of an unmodeled, small, constant, Doppler blue shift drift of order 6\times 10^{-9} Hz/s. After accounting for systematics, this drift can beinterpreted as a constant acceleration of a_P= (8.74 \pm 1.33) \times 10^{-8}cm/s^2 directed towards the Sun, or perhaps as a time acceleration of a_t =(2.92 \pm 0.44)\times 10^{-18} s/s^2. Although it is suspected that there is asystematic origin to this anomaly, none has been unambiguously demonstrated. Wereview the current status of the anomaly, and then point out how the analysisof early data, which was never analyzed in detail, could allow a more clearunderstanding of the origin of the anomaly, be it a systematic or amanifestation of unsuspected physics.Comment: 19 pages, 6 figures, 2 tables, additional materia

Using early data to illuminate the Pioneer anomaly