About to exit our solar system
In general the farthest point in a satellite's orbit from its focus is its apoapsis. If the focus is the Sun or Earth however then you would say the satellite's farthest point is its aphelion and apogee, respectively.
The farthest artificial satellite from its parent planet is Voyager 1, which has gone beyond the influence of the Sun and is now in interstellar space.
The farthest point a satellite in orbit around the Earth can be from the Earth is called apogee. This is the point in the orbit where the satellite is the farthest from Earth.
Apogee
The superlative form of the adverb "far" is "farthest" or "furthest."
farthest or furthest
farthest or furthest
farthest
the farthest
Farther is the comparative of far, and the superlative is farthest.
farthest
farther, farthest