Hi Pavel! Every body in the simulation start out with a set of initial position and velocity vectors. For the solar system scenarios, I got these vectors from

Hi Pavel! Every body in the simulation start out with a set of initial position and velocity vectors. For the solar system scenarios, I got these vectors from NASA JPL's Horizon System (https://ssd.jpl.nasa.gov/horizons.cgi#top https://ssd.jpl.nasa.gov/horizons.cgi#top), so the orbit of Juno that you are observing is its actual orbit... Its eccentricity (the extent to which the shape of the orbit departs from a perfect circle) is extremely high; at its closest point, the orbit brings Juno right above the cloud tops of Jupiter, and at its furthest point Juno finds itself beyond Themisto (one of Jupiter's irregular Moons which I should perhaps add to the scenario). Juno was meant to have a less eccentric orbit, but as technical problems were encountered when they were going to fire Juno's thrusters to reduce the eccentricity of the orbit, NASA played it safe and let Juno stay on its eccentric orbit. One of the advantages of this is that Juno only spends a very short amount of time in Jupiter's insanely powerful and to a spacecraft damaging magnetic field, so the technical mishap is probably one of the reasons JunoCam is still operating and giving us beautiful images of Jupiter's swirling clouds! Here's a gif from WikiPedia showing how stretched out Juno's orbit is https://en.wikipedia.org/wiki/Juno_(spacecraft)#/media/File:Animation_of_Juno_trajectory_around_Jupiter.gif https://en.wikipedia.org/wiki/Juno_(spacecraft)#/media/File:.... Sorry for the long rant, but I find these things to be awesomely fascinating.