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The so-called flyby anomaly is a yet unexplainable velocity jump measured atseveral Earth flybys of spacecraft. Known physical effects could be excluded assource of this anomaly. In order to model a possible new physical effect,empirical equations were proposed by Busack (2007) and Anderson et al. (2007),which gave quite good description of all measured anomalies. Some theories weresuggested deriving the Anderson formula or a similar one. The recent two Earthflybys of the spacecraft Rosetta showed no measurable anomaly, although theAnderson formula predicted distinct effects for both flybys. The Busack formulapredicted the null results, so the notion of a possibly correct formula or ofan error of the older measuring software was supported. The forthcoming Earthflyby of Juno gives a good opportunity to decide this question or give rise toenhanced theory, because the orbit parameters are very similar to earlierflybys with notable effects. In this article, the flyby anomaly according tothe Busack equation will be predicted to be about -7mm/s in contrast to thevalue after the Anderson equation and similar ones with distinct positive valueof the order of +6mm/s.

Expected velocity anomaly for the Earth flyby of Juno spacecraft on October 9, 2013