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During the last decade, the precision in the tracking of spacecraft hasconstantly improved. The discovery of few astrometric anomalies, such as thePioneer and Earth flyby anomalies, stimulated further analysis of the operativemodeling currently adopted in Deep Space Navigation (DSN). Our study shows thatsome traditional approximations lead to neglect tiny terms that could haveconsequences in the orbit determination of a probe in specific configurationssuch as during an Earth flyby. Therefore, we suggest here a way to improve thelight time calculation used for probe tracking.

Transponder delay effect in light time calculations for deep space navigation