Track To With A Sphere?(Rigid Body)

what is the best way to do this?

I guess I could use another object and a constraint to pull the object but is there a better way?

What about a python script that gets the location of the object being tracked, then applies the same location to the tracking object with the cordinates being altered slightly.

For example: get object A cordinates (x, y, z), but apply to object B (x+1, y, z).