[dalkvist]

The way we detect things in our own solar system is basically to take several images of the same patch of sky and look for things that moved. Objects that far out have a slow apparent motion and require repited observations days apart. We have a limited amount of telescopes that are sensitive enough and time on them are very competitive. But we have new telescopes on the way and on the next few years there will likely be many more confirmed objects on the outer solar system.