USA 36, also known as Delta Star, is an SDI experiment satellite with NORAD Catalog ID 19911 and Object ID 1989-026A. It was launched on March 24, 1989, from the Cape Canaveral Air Force Station Launch Complex 17B using a Delta 3920-8 launch vehicle. The satellite has dimensions of 5.5 meters in length and diameter with a span of 5.5 meters, weighs 2,600 kilograms at launch, and had a dry mass of 2,156 kilograms. It is equipped with two deployable solar arrays and batteries for power supply. USA 36 was manufactured by MDAC for the SDIO (Strategic Defense Initiative Organization) to conduct SDI experiments. The satellite's shape is described as a step box with two panels and has an RCS value of 17.33. It had a planned lifetime of 9 months.