Spacecraft like Juno have very specific orbits to follow that are planned very far in advance in order to maximize their mission time. If, say, Juno swings too close to Io, it might get a gravity assist that ejects it from Jupiter, in which case it’s no longer very useful is it.
djmustturd t1_j607dh3 wrote
Reply to comment by [deleted] in How come space probes generally take photos of moons or asteroids from several hundred (or thousands) of kilometers away from the object they orbit? by Different_Muscle_116
Spacecraft like Juno have very specific orbits to follow that are planned very far in advance in order to maximize their mission time. If, say, Juno swings too close to Io, it might get a gravity assist that ejects it from Jupiter, in which case it’s no longer very useful is it.