Mission type Optical imaging SATCAT no. 2491 Spacecraft type Zenit-2 Launch date 14 October 1966 | COSPAR ID 1966-091A Mission duration 7 days Manufacturer OKB-1 | |
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Kosmos 129 (Russian: Космос 129 meaning Cosmos 129) or Zenit-2 No.33 was a Soviet optical film-return reconnaissance satellite launched in 1966. A Zenit-2 spacecraft, Kosmos 129 was the forty-second of eighty-one such satellites to be launched and had a mass of 4,730.0 kilograms (10,427.9 lb).
Kosmos 129 was launched by a Vostok-2 rocket, serial number U1500-05, flying from Site 41/1 at the Plesetsk Cosmodrome. The launch took place at 12:13:08 UTC on 14 October 1966, and following its successful arrival in orbit the spacecraft received its Kosmos designation; along with the International Designator 1966-091A and the Satellite Catalog Number 2491.
Kosmos 129 was operated in a low Earth orbit; at an epoch of 14 October 1966 it had a perigee of 180 kilometres (110 mi), an apogee of 312 kilometres (194 mi) inclination of 64.6 degrees and an orbital period of 89.42 minutes. After seven days in orbit, Kosmos 129 was deorbited, with its return capsule descending under parachute and landing at 06:14 UTC on 21 October 1966.