Pioneer 10 and 11 orbit determination analysis shows no discrepancy with Newton-Einstein's laws of gravity

Understand

The present work describes the investigation of the navigation anomaly of Pioneer 10 and 11 probes which became known as the Pioneer Anomaly.

• It appeared as a linear drift in the Doppler data received by the spacecraft, which has been ascribed to an approximately constant sunward acceleration of about $8.5 \times 10^{-13} km/s^2$.
• Since then, the existence of the anomaly has been confirmed independently by several groups and a large effort was devoted to find its origin.
• The present study consists of two main parts: thermal modeling of the spacecraft throughout its trajectory, and orbit determination analysis.