I perform an independent analysis of radio Doppler tracking data from the Pioneer 10 spacecraft for the time period 1987–1994 .
All of the tracking data were taken from public archive sources , and the analysis tools were developed independently by myself .
I confirm that an apparent anomalous acceleration is acting on the Pioneer 10 spacecraft , which is not accounted for by present physical models of spacecraft navigation .
My best fit value for the acceleration , including corrections for systematic biases and uncertainties , is ( 8.60 \pm 1.34 ) \times 10 ^ { -8 } cm s ^ { -2 } , directed towards the Sun .
This value compares favorably to previous results .
I examine the robustness of my result to various perturbations of the analysis method , and find agreement to within \pm 5 \% .
The anomalous acceleration is reasonably constant with time , with a characteristic variation time scale of > 70 yr .
Such a variation timescale is still too short to rule out on-board thermal radiation effects , based on this particular Pioneer 10 data set .