This question asked about aliens launching meteors at major metropolitan areas on Earth, but explicitly excluded the accuracy of the meteors from the question.
In this specific scenario aliens are using asteroids from our asteroid belt and launching them at earth to target specific cities. Never mind how they target (unless it is relevant to your answer) so accurately.
I'm interested in the targeting part of this question. How accurately could you hit a city on Earth with an asteroid from the belt?
Assumptions about the city are the same as the previous question:
- 450 sq miles of land area
- Generally flat land area, no more than 500 feet min/max elevation change
- Essentially I want a city destroyed but I don't want regional/global firestorms or cooling.
Another assumption: Once the asteroid is initially accelerated, no further course corrections can be made. This is an unguided, unpowered projectile.