In the Max Range field, enter a value corresponding to the minimum allowable distance between the reference object and any other object.
This feature works by imposing a Max Range constraint on the reference object, but its effect, from a conceptual standpoint, is to define a sphere around the reference object marking the minimum allowable distance between the reference object and other space objects.
During analysis, when the Close Approach Tool finds an object that is within the range specified in this field, the object and the associated time are flagged and displayed.
Besides imposing a Max Range constraint on the reference object, the Close Approach Tool removes other constraints on that object. If you plan on using an object that has been the subject of a close approach analysis in other computations, you should restore the desired constraints to that object.