What was the first man-made object to leave the solar system?

Pioneer 10 was the first man-made object to leave the solar system. Pioneer 10 (also known as Pioneer F) is a 258-kilogram robotic space probe launched by NASA on March 2, 1972 to study the asteroid belt, the environment around Jupiter, solar wind, cosmic rays and eventually the far reaches of the solar system and heliosphere. It was the first spacecraft to traverse the asteroid belt and the first to encounter Jupiter.