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Targetting what with a missile? In order to nudge the target you need to 'push' it is a direction. You can't just hit it anywhere otherwise you will get unpredictable results. Park in the sense of place the missile in a predefined position off the surface of the asteroid and explode it. Physically impacting the asteroid itself may not produce the desired result. A single explosion is just going to blast material off the surface. In space there is no concusive effect so prolonged effects will come from irradiation of the surface.
Deep Impact was controlled in the sense that they could hit the target when they wanted to - not target the exact point that they wanted to hit.
My mysterious object - well I have put the results up for publishing. The 'old' camp says the results can be explained by YORP (just). The 'young' camp says YORP can't even come close so look for another mechansim. For me, I have no opinion on either - I'm struggling enough with math and working through the math required for Binary Asteroids. To give you an idea of how far behind I am, I have only just been able to derive;
DsDp = Sqrt(10^(0.4*dm)-1) from dm = 2.5 Log(F/F')
where DsDp = Size ratio, dm is delta magnitude of the eclipse events, F and F' are flux from the Uneclipsed and Eclipsed system.
Trying to get my head around angular momentum now......
Cheers
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