Looking for asteroids near Dres

[Aerotusk]

So, I based my mission on the idea of flying into the orbit of the sun, refueling withe an asteroid, then flying to Dres and refueling on another asteroid. However, I don't see any asteroids near Dres. I was wondering if I have to be in orbit of Dres, or maybe just really close to it? 

 

[Streetwind]

You likely need to enter its SOI at least once before you see anything. I've also read that these things are rare, and it can take 20-30 Kerbin days before even one spawns.

Also, keep in mind that you need a level 3 tracking station for any asteroids to spawn anywhere.