I'm curious aboutConsider the following hypothetical event: let's suppose that aa Voyager spacecraft (1 or 2) changes its planned interstellar trajectory quite suddenly (ok, I'mI'm well aware of motion and gravity laws and I know that this shouldn't occur, but let's just pretend they are flying by an unobserved massive object). Would the engineer team here on Earth detect it? How?
I've read a lot through Voyager Interstellar Mission website, but I couldn't find any detailed information on how spacecraft position and speed is determined.
Thank you a lot!