Orbit Collision Axis

I have some objects continuously orbiting a sphere at a fixed distance. Each have a sphere collider attached and are NOT using rigidbodies. I have detected the collisions in the OnTriggerEnter() method and I need to figure out how to allow the objects to "bounce" off one another and then start orbiting on their new axes. Does anyone have any idea how to do this?

Or if someone could help me figure out how to get my objects to continuously and smoothly orbit a sphere using rigidbodies, I would be open to that as well because that would take care of the collision "bounce" for me. I would need to be able to dynamically add new orbiting objects.