who launched it?
NASA
Pioneer 11
Pioneer 11 (also known as Pioneer G) is a robotic space probe launched by NASA 
what is the atmosphere of the planet saturn The outer atmosphere of Saturn contains 96.3% molecular hydrogen and 3.25% helium by volume how are rings formed? They are composed predominantly of water ice, with trace amounts of tholin impurities and a peppered coating of approximately 7% amorphous carbon what are its physical characteristics? It is a gas giant because it is predominantly composed of hydrogen and helium, it lacks a definite surface, though it may have a solid core, its rotation causes it to have the shape of an oblate spheroid; that is, it is flattened at the poles and bulges at its equator does it have any moons? Yes, it has 82 known moons, 53 of which have formal names were there any missions carried out as a part of its research? Yes, "Pioneer 11" made the first flyby of Saturn in September 1979
wiki:25661117
Pioneer 11 [SEP] Introduction
Pioneer 11 (also known as Pioneer G) is a robotic space probe launched by NASA on April 6, 1973 to study the asteroid belt, the environment around Jupiter and Saturn, solar wind and cosmic rays. It was the first probe to encounter Saturn and the second to fly through the asteroid belt and by Jupiter. Thereafter, "Pioneer 11" became the second of five artificial objects to achieve the escape velocity that will allow them to leave the Solar System. Due to power constraints and the vast distance to the probe, the last routine contact with the spacecraft was on September 30, 1995, and the last good engineering data was received on November 24, 1995.