[RightWhale]

True the need three observations to get a solution. However, if the three points are close together the orbit will be known less well than if the three points are spread out more. The other thing is that the orbit will change when the body is deflected by passing through a gravity well or if it collides with something. So they will need to track this one and all the others from here on, plus they will need to keep tracking it even if they deliberately deflect the orbit becuse it will come around again.

[Scully]

The other thing is that the orbit will change when the body is deflected by passing through a gravity well or if it collides with something.

Which of course it will, given Murphy's Law. These astronomers are a bit too glib with their prognostications (apologies to RadioAstronomer - who would NEVER make such an assertion without sufficient data).