The STSS ATRR (USA 205), also known as STSS-ATRR, is a US satellite designed for early warning technology. It was launched on May 5, 2009, from the AFWTR launch site using the Delta 7920-10C launch vehicle. The spacecraft has dimensions of 4 meters in length, 2.5 meters in diameter, and an 8-meter span. With a dry mass of 1800 kg and a launch mass of 2000 kg, it is configured as a SA-200HP model manufactured by GDG for MDA (Mission Data Analysis). Its primary mission involves early warning technology and risk reduction for advanced technologies related to space surveillance. The satellite's shape consists of a box with two panels, but specific details such as power supply, transmitters, or major events are not provided in the given data.