Who was the first astronaut to land on Jupiter?

No one has yet landed on any planet except earth. It would be very difficult to land on the surface of Jupiter - (1) because we don't know if it even has a solid surface, (2) even if it did, the surface pressure would be so great that it would crush any astronaut, (3) Jupiter is very far away, (4) the extreme radiation would kill any living thing that enters the atmosphere.