Thanks for the help, adding some more points to this if they help:
All of our orbits will be in Earth orbit, we’re effectively simulating natural and man-made satellites in various earth-based orbits. The man-made satellites will be under player control, but here’s where it gets tricky, we want to randomly spawn in things like asteroids. These things don’t have to affect one another, but it’d be a huge bonus if they did, and if they also affected the man-made satellites orbiting as well.
So this kind of simplifies things, but at the same time not so much. We’d like to use the inbuilt PhysX engine of Unreal to reduce the overhead and greatly simplify collision handling and what-not, but is it more efficient for us to use non-rigid bodies and just move them manually through our own equations? Currently all we’re doing is applying force, after giving something an initial velocity and both objects a mass.