Kosmos 173
Kosmos 173 ( meaning "Cosmos 173"), also known as DS-P1-Yu No.8 was a Soviet satellite which was used as a radar calibration target for tests of anti-ballistic missiles. It was a spacecraft, was built by the Yuzhnoye, and launched in 1967 as part of the Dnepropetrovsk Sputnik programme. A Kosmos-2I 63SM carrier rocket was used to launch Kosmos 173 from Site 133/1 at Plesetsk Cosmodrome. The launch occurred at 04:59:49 GMT on 24 August 1967, and resulted in Kosmos 173's successful deployment into low Earth orbit. Kosmos 173 was operated in an orbit with a  perigee of , an apogee of , an inclination of 71.0°, and an orbital period of 92.3 minutes. It remained in orbit until it decayed and reentered the atmosphere on 17 December 1967. It was the ninth of seventy nine DS-P1-Yu satellites to be launched, and the eighth of seventy two to successfully reach orbit.