According to Slava Turyshev of JPL in the paper "Support for temporally varying behavior of the Pioneer anomaly from the extended Pioneer 10 and 11 data sets," published in Physical Review Letters in 2011, the anomaly has a temporally-decaying (not constant as previously thought) nature and points towards Earth.
He is known for his investigations of the Pioneer Anomaly, affecting Pioneer 10 and Pioneer 11 spacecraft, and for his attempt to recover early data of the Pioneer spacecraft to shed light on such a phenomenon.
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Slava G. Turyshev (Russian: Слава Турышев) is a Russian physicist now working in the US at the NASA Jet Propulsion Laboratory (JPL).
Slava Turyshev | Slava | Desi Slava | Slava Polunin |