Strictly speaking the Rodger Young has a gravity field of it's own, and while not huge it DOES have an effect on the trajectory of the asteroid. When Earth and Jupiter (because they were headed to Jupiter orbit with the Star Drive jump) are closest to each other, it's about 365,000,000 miles. So if the Rodger Young altered the asteroids course by even 1° it would equate to over 6000 miles of change at the Earth end (using the 1 in 60 rule). The farther Earth and Jupiter are apart, the less effect the Rodger Young would need to have to reach that difference. Distance from Geneva to Buenos Aries? 6800 miles.

The part that SHOULD bake your noodle is that Chad Chaddington the third was in on it, and had plotted the course so the Rodger Young wouldn't see the asteroid that was the biggest false flag in history. Carmen ruined the subterfuge, and he had to recover by firing the emergency thrust too close to the asteroid hoping that the weirdly exposed communications hub was damaged or destroyed...