1. The energy from a nuke is radiated in a sphere. So not all energy is used against asteroid. There is no atmosfere - medium to transfer blast/shock wave. So you are relaying purely on radiation. So the nuke heat it and what next? There will be short time of breaking from reradiating energy into space and that it.

Actually Tamara is passive system - use all radio waves sent from a plane - especially from radio altimeter and then use TDOA method to triangulate source. There are some claims that actually next gen systems can use TV, GSM and other radio wave sources to detect planes. Not good - but also not bad start into the…