Quote from NeutronStar on 02/13/09 at 12:32:47:
how come my chairiklo seems to liberate? And how do you get your planets in a straight line, mine make an oval?
In order to get the resonance presented you should adapt the rotating frame setting to the correct orbital period . This makes the primary stable . This wasn't the case in your animation .
Once this is done Uranus will make an oval which will stay at its location . One can also take the asteroid as the primary , but this isn't generally done .
The reason why Uanus makes a straight line in my visualisation is that I used my own simulator (similar to GravSim ) . Here I adapt the screenshot continiously in order to position the orbit of the primary at a fixed angle . So while the angle is fixed Uranus orbit shows up as a line due to its eccentricity .
If eccentricity would be zero the primary will show up as a point .