I refer you to
http://neo.jpl.nasa.gov/neo/, where you can learn all about how Near Earth Objects are detected, their obits plotted, and the various uncertainties attendant on these orbits.
True, they aren't exactly as regular as the downtown bus, but they are darn close. Now, I want you to tell me why it is NOT possible to predict an orbit.
I refer you to http://neo.jpl.nasa.gov/neo/, where you can learn all about how Near Earth Objects are detected, their obits plotted, and the various uncertainties attendant on these orbits.
Sorry, but the only thing I learned was that a Photoshop-like program was used to depict the only "asteroid" shown in that site ...
