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Juno's low perijove should be great for measuring Jupiter's gravitational effect on Juno's orbit. Cassini together with VLBI has measured Saturn's location to within 4 km.

Will Was Juno be able to be measured by VLBI to determine Jupiter's location and orbit at a similar precision? At a precision useful for mapping the Solar System outside of the Kuiper Belt?

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    $\begingroup$ Without doing the leg work to really find an answer, I'm going to go with: I doubt it. Cassini has been orbiting Saturn for 12 years now. That's a lot of good data. Juno will only last ~1.5 years and won't have any orbital maneuvers. That's likely not enough to get precise measurements of Jupiter's position, and frankly isn't a science goal of the Juno mission. $\endgroup$ – zephyr Oct 5 '16 at 12:58

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