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Fraser
2017-Dec-01, 09:00 PM
Using the Juno mission's orbit of Jupiter, a team of scientists has developed a possible explanation for the long-standing "flyby anomaly"
The post Juno Isn’t Exactly Where it’s Supposed To Be. The Flyby Anomaly is Back, But Why Does it Happen? (https://www.universetoday.com/137984/juno-isnt-exactly-supposed-flyby-anomaly-back-happen/) appeared first on Universe Today (https://www.universetoday.com).


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bknight
2017-Dec-01, 09:29 PM
Ah yes but they didn't consider Planet X, with its orbital effect on Cassini. There appears to be subtle changes that all the community has yet to resolve, but are learning about.

borman
2017-Dec-14, 11:47 PM
Version 2 of the paper came out today on the arXiv:
A possible flyby anomaly for Juno at Jupiter
https://arxiv.org/abs/1711.08893

Juno is in an eccentric polar orbit. 15 minutes prior to perijove an anomalous acceleration is noted only to vanish 15 minutes after perijove.

Data is from two of the first three orbits because the second orbit was in safe mode. There are to be 36 orbits which may improve sigma.

While it may relate to the flyby anomaly which has been monitored in some hyperbolic flybys, these measurements seem more to correspond to hints of an anomaly seen in the more extreme eccentric orbits of spacecraft orbiting earth helping to confirm its presence.

Perhaps since the earlier hint of discovery was older and not at the time associated with the flyby anomaly, but referred to as a “pass bias”, it may have escaped being cited:

Relativity in the Global Positioning System
Section 6 page 23

https://link.springer.com/content/pdf/10.12942%2Flrr-2003-1.pdf

The canceled STE-QUEST mission might have given more accurate information about this “pass bias”. But the observation of it about Jupiter as well as Earth may promote further investigation.