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This paper discusses the likelihood of whether the Pioneer anomaly is due to'mundane' systematic errors/effects or indicative of new or unappreciatedphysics. The main aim of this paper is to argue that recent publicationssuggesting that the anomaly is previously overlooked thermal recoil forces,which is in stark contrast to the earlier consensus (1998-2010), are open toquestioning. Both direct and circumstantial evidence are examined, and theuncertainty or inaccuracy associated with observations of such a smallmagnitude effect is recognised. Whilst a non-systematic based anomaly appearsto be very unlikely, by way of the awkwardness of the observationalcharacteristics that would need to be modelled, the existence of otherperipheral anomalous phenomena makes an outright dismissal of the anomalyunwise. Issues from the philosophy of science (and physics) are also tabled. Inthe interests of having a contingency plan, should future experiments providesupport for a Pioneer-like anomaly, the type of unappreciated physics thatcould conceivably satisfy the awkward observational evidence is alluded to,albeit in a non-rigorous and cursory manner.

The Pioneer Anomaly: an inconvenient reality or NASA's 12 year misconception?