I am trying to create a model/simulation for a pair of binary asteroids in orbit around the sun and I'm wondering what would the best way to do this? The restricted 3-body problem doesn't work as I can't assume any of the 3 bodies as having negligible effect right? However the full 3 body problem incorporates the movement of the sun as a result of the asteroids which is negligible. I'm starting to get confused with all the different n-body problems. Any help much appreciated.