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Impractical missions of the far future
Am I right that Uranus is a uniquely poor target for a Cassini / Galileo class satellite-tour mission, since it lacks a gigantic satellite for Oberth-effect maneouvres, so you'd have to carry fuel enough for every orbit change you'd want to do?
http://www.alcyone.com/software/botec/
suggests that it's 3km/sec delta-v from Oberon to Miranda, which is really a very large burn if you have to do it without benefit of slingshot. And I suspect slingshotting round Uranus requires a perigee low enough that you worry about running into the rings; whilst the main rings are well-delimited, http://wisp.physics.wisc.edu/astro104/lecture25/F16_10.jpg (a back-lit image) suggests that there are ringlets everywhere, it's no safer than trying to fly through the Cassini division.
Tom, contemplating icy moons.
http://www.alcyone.com/software/botec/
suggests that it's 3km/sec delta-v from Oberon to Miranda, which is really a very large burn if you have to do it without benefit of slingshot. And I suspect slingshotting round Uranus requires a perigee low enough that you worry about running into the rings; whilst the main rings are well-delimited, http://wisp.physics.wisc.edu/astro104/lecture25/F16_10.jpg (a back-lit image) suggests that there are ringlets everywhere, it's no safer than trying to fly through the Cassini division.
Tom, contemplating icy moons.
Yes...
I'm sorry, someone had to do that. There were so many other obvious comments...