"Welcome to Jupiter," said a commentator at mission control at NASA's Jet Propulsion Laboratory in Pasadena, California. The room erupted in cheers as the solar observatory successfully entered its aimed-for orbit around Jupiter at 11:53 pm (0353 GMT Tuesday).
The spacecraft has traveled 1.7 billion miles (2.7 billion kilometers) since it launched five years ago from Cape Canaveral, Florida.
"We are in it," hollered Scott Bolton, NASA's principal investigator. "You are the best team ever," he told his colleagues at mission control. "You just did the hardest thing NASA has ever done."