Galilean moons of Jupiter and their orbit lines do not line up

[pkgw]

Initially reported on the forums.

At the moment, when you look at Jupiter, the rendered spheres of the Galilean moons don't line up with their orbit lines

1. Look at Jupiter in Solar System mode in the webclient
2. Speed up time so that the Galilean moons are orbiting noticeably
3. Zoom out so that you can see both the sphere and the orbit lines.

For me, they are far apart from one another.

Alyssa's report mentioned scaling planet size, but from what I'm seeing, you don't need to do that to see that something is amiss.

I don't remember seeing this problem before, and I've been playing around with Jupiter's moons recently. Could there be a recent change that would have introduced this?

[astrojonathan]

We don't calculate the orbit trajectory every frame because it is CPU intensive and we cache it, computing thousands of orbit points on all the planets and major moons each frame render is prohibitively expense, but it does mean that cached version of the orbit lines are not always representative of the orbit as it evolves, even though the future moon position is correct, the orbit might be the orbit as seen now and in the recent future or recent past.