[r00fus]

Maybe if said asteroid were fitted with a lightsail?

[kurthr]

You only lose ~50% using ablation rather than reflection so it would work fine without a lightsail.

Long ago there was discussion of using X-Ray lasers pumped with nukes as well.

https://www.nytimes.com/1992/07/21/us/star-wars-x-ray-laser-...