Posted: Jan 21, 2022 1:07 pm
by hackenslash
Doppler shift in reception throughout the flight would be the obvious check for ensuring accuracy, I'd venture, though it's mostly a matter of extremely careful planning of the entire flight from selection of launch window to orbital insertion all carefully timed, a.k.a., the brilliance of Katherine Johnson.

Now ask yourself the same question about Cassini-Huygens which, after four slingshots and a distance of 15x1011 kilometres, executed an insertion burn to go from a hyperbolic to an elliptical orbit (this was Johnson's truly spectacular genius again) within 20 metres of its targeted orbit using math from a guy who was wrong (albeit only wrong by that minuscule margin).

Boggles the mind