The 1969 Mars mission was conducted with Mariner 6 and 7, follow-on designs of earlier Mariners. Each spacecraft weighed 413 kilograms (910 pounds) and measured 3.35 meters (11 feet) from the scan platform to the top of the low-gain antenna. The width across the solar panels was 5.8 meters (19 feet). The eight-sided body of the spacecraft carried seven electronic compartments. A small rocket engine, used for trajectory corrections, protruded through one of the sides. The planetary experiments aboard the spacecraft were two television cameras, an infrared radiometer, an infrared spectrometer and an ultraviolet spectrometer. The spacecraft were launched in February and March 1969, and flew past Mars in July and August 1969.