I still remember the first time I tracked down Pluto back in my amateur astronomy days, it was quite cool even though it just looked like a faint star gradually moving among the background stars over a period of days, the actual realization when I knew I had tracked it down was a memorable feeling.
Yes it's amazing what they can do, I am still amazed how they predicted comet Shoemaker\Levy 9 was going to hit Jupiter more than a year out, and when the impact would occur, mind boggling