We probably could if it's travelling at low enough velocity. But if you match its orbit you're just going the same place at it is anyway, at which point "piggyb

We probably could if it's travelling at low enough velocity. But if you match its orbit you're just going the same place at it is anyway, at which point "piggybacking" is just code for "getting some company". And if you don't match it well enough that you end up roughly the same place you're going to have a fast, and therefore violent, encounter.