It was a 250-kilogram (550 lb) spacecraft, which was built by the Yuzhnoye Design Bureau, and was used as a radar calibration target for anti-ballistic missile tests.

[1] Kosmos 307 was launched from Site 86/4 at Kapustin Yar,[2] atop a Kosmos-2I 63SM carrier rocket.

The launch occurred on 24 October 1969 at 13:01:58 UTC, and resulted in the successful deployment of Kosmos 307 into low Earth orbit.

Kosmos 307 was operated in an orbit with a perigee of 212 kilometres (132 mi), an apogee of 2,023 kilometres (1,257 mi), 48.4 degrees of inclination, and an orbital period of 107.7 minutes.

[1][4] It remained in orbit until it decayed and reentered the atmosphere on 30 December 1970.