True all the asteroids in the Asteroid Belt would not equal the size of our moon. I was taking the questions as a theoretical one.
Why couldn't you have the missions launched from out moon itself instead?
That would seem more feasible.
Well I'm not sure if you already saw this link but
http://www.universetoday.com/92022/Earth's-other-moons/
Based on this article there have already been other natural satellites of the Earth in the past. The question is whether it would be possible to keep the satellite in orbit for long...
