Before The Planetary Society stepped in to help, only about 11 years of Pioneer Doppler data had been analyzed, and the Pioneer anomaly remained a mystery. A lot of the remaining data (more than 19 years of it) were stored on old 7- and 9-track magnetic tapes needed to be saved and converted to modern media. By June 2006, scientists and engineers led by Slava Turyshev at the Jet Propulsion Laboratory were able to recover much of the more than 30-year navigational histories of both spacecraft.

JPL