The Anomalous Trajectories of the Pioneer Spacecraft

Abstract

Because of their unique designs, the Pioneer 10 and 11 spacecraft have provided the cleanest Doppler, deep-space navigation data. Analysis of this data can be interpreted as showing an anomalous acceleration of these craft directed towards the Sun of $a_P\sim 8\times 10^{-8}{cm/s}^2$. The background of this discovery and the significance of the result are discussed.

Comments: 5 pages, 2 figures, to be published in the Proceedings of the Second Meeting on CPT and Lorentz Symmetry