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Radiometric tracking data from Pioneer 10 and 11 spacecraft has consistentlyindicated the presence of a small, anomalous, Doppler frequency drift,uniformly changing with a rate of ~6 x 10^{-9} Hz/s; the drift can beinterpreted as a constant sunward acceleration of each particular spacecraft ofa_P = (8.74 \pm 1.33) x 10^{-10} m/s^2. This signal is known as the Pioneeranomaly; the nature of this anomaly remains unexplained. We discuss the effortsto retrieve the entire data sets of the Pioneer 10/11 radiometric Doppler data.We also report on the recently recovered telemetry files that may be used toreconstruct the engineering history of both spacecraft using original projectdocumentation and newly developed software tools. We discuss possible ways tofurther investigate the discovered effect using these telemetry files inconjunction with the analysis of the much extended Doppler data. We present themain objectives of new upcoming study of the Pioneer anomaly, namely i)analysis of the early data that could yield the direction of the anomaly, ii)analysis of planetary encounters, that should tell more about the onset of theanomaly, iii) analysis of the entire dataset, to better determine the anomaly'stemporal behavior, iv) comparative analysis of individual anomalousaccelerations for the two Pioneers, v) the detailed study of on-boardsystematics, and vi) development of a thermal-electric-dynamical model usingon-board telemetry. The outlined strategy may allow for a higher accuracysolution for a_P and, possibly, will lead to an unambiguous determination ofthe origin of the Pioneer anomaly.Comment: 43 pages, 40 figures, 3 tables, minor changes before publicatio

A STUDY OF THE PIONEER ANOMALY: NEW DATA AND OBJECTIVES FOR NEW INVESTIGATION