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That looks great Dennis.
I think what you are seeing is the result of the differences in proper motion between the two objects. It looks like Uranus is curving, but that is an optical illusion. I believe it due to the fact that the moons orbital radius is so much smaller than Uranus and it's obit is tilted differently to Uranus in respect to our viewpoint, that the moon is "dropping away" from the orbit of Uranus. Try overlaying you images with Uranus going straight, and moon will drop away.
Fantastic illustration
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