#UNIVERSE SANDBOX 2 SIMULATION F FULL#

I honestly wouldn't recommend using his math except for fairly earthlike planets orbiting fairly Earthlike stars. I know that errors in the simulation's math build up over time so it's more likely to do weird stuff as time goes on so I didn't let the simulations run that long.Īrtifexian's math involves a lot of simplifications that may not hold up under the more complex simulation of US2. They were a bit wobbly, but survive for several planetary orbits at least.

#UNIVERSE SANDBOX 2 SIMULATION F FULL#

At 0.13 AUs, and using Ganymede as a surrogate (so it's a little shy of the full 2.3 lunar masses of your intended moon at only 2.02 lunar masses), I started getting relatively stable lunar orbits at about 240,000km and inward from the planet's center. I tinkered around more with the simulation. An asteroid that's solid iron can orbit much closer than one that's made up of gravel loosely bound together by gravity. They also depend on the composition of the orbiting body and how well that material can handle tidal stress. Of course, Roche Limits aren't fixed boundaries. Its already equivalent to the fragments that break off the larger moons. Deimos didn't start breaking up though, so if you're using something like that as your minor moons, then it's possible the simulation can't break it into smaller pieces due to resolution issues. I put Mimas a little closer and it took longer for it to break apart, but within a few days its orbit was full of fragments and it was obviously shedding mass. Just tested it out by placing Luna way too close to Earth and it shattered pretty fast.

Universe sandbox does include Roche Limits. So whose side should I take? Universe Sandbox 2 with its seemingly complex and realistic math, or the more simple spreadsheet? And if I place a minor moon ridiculously close (21 000km from the centre of the planet) it seems to be stable. If I try to place the major moon anywhere further than roughly 140 000km, it is ejected from the planetary system. This does not translate into Universe Sandbox at all, however. The most problematic being the Hill Sphere and the Roche Limit.Īccording to the spreadsheet, my planet (m=5 earth masses r=2 earth radii) that orbits around a red dwarf (M=0,3 solar masses) has a Hill sphere of about 80 Earth radii (around 508 000 km), while the Roche limit sits at around 4,8 Earth radii (30 000 km). The problem is that what the spreadsheet says doesn't align with what happens when I put everything that -seems to be checking out- into Universe Sandbox 2. Using Artifexian's brilliant tutorials, I've constructed a spreadsheet that gives me all I need to know. I've been trying to construct a rather complex planetary system, with a Super Earth, one major moon and six other minor moons. We also encourage users to register an account.

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Universe sandbox 2 simulation f