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The radio-metric Doppler tracking data from the Pioneer 10/11 spacecraft,from between 20-70 AU, yields an unambiguous and independently confirmedanomalous blue shift drift of a_t = (2.92 \pm 0.44)\times 10^{-18} s/s^2. Itcan be interpreted as being due to a constant acceleration of a_P = (8.74 \pm1.33) \times 10^{-8} cm/s^2 directed towards the Sun. No systematic effect hasbeen able to explain the anomaly, even though such an origin is an obviouscandidate. We discuss what has been learned (and what might still be learned)from the data about the anomaly, its origin, and the mission designcharacteristics that would be needed to test it. Future mission options areproposed.Comment: 16 pages, 7 figures, to be published in the AIP Conference  Proceedings of the 2nd Mexican Meeting on Mathematical and Experimental  Physic

The Pioneer Anomaly: The Data, its Meaning, and a Future Test