Ronald Held wrote:
Why would you want to remove the gas in such a brute force fashion? What is the effect on the atmosphere of dust due to the collision and an orbital cloud of debris?
Dust would probably have a nice cooling effect and then settle leaving the planet ready for colonisation. As for orbital debris, that will probably soon fall back to the planet or fly off into space.
Nevermind anyway, the size difference between Venus and Vesta is huge, it would be like firing a pea shooter at it.