|Mission type||Optical imaging reconnaissance|
|Mission duration||8 days|
|Launch mass||4730 kg |
|Start of mission|
|Launch date||7 January 1966|
|Launch site||Baikonur, Site 31/6|
|End of mission|
|Landing date||15 January 1966|
|Reference system||Geocentric |
|Perigee altitude||193 km|
|Apogee altitude||380 km|
|Epoch||7 January 1966|
Kosmos 104 (Космос 104 meaning Cosmos 104) or Zenit-2 No.36 was a Soviet, first generation, low resolution, optical film-return reconnaissance satellite launched in 1966. A Zenit-2 spacecraft, Kosmos 104 was the thirty-second of eighty-one such satellites to be launched and had a mass of 4,730 kilograms (10,430 lb).
Kosmos 104 was launched by a Vostok-2 rocket flying from Site 31/6 at the Baikonur Cosmodrome. The launch took place at 08:24 GMT on 7 January 1966; however, program not completely met. Spacecraft put into incorrect orbit by abnormal function of second and third stages of booster. The spacecraft received a Kosmos designation, along with the International Designator 1966-001A and the Satellite Catalog Number 01903.
Despite the problem during its launch, Kosmos 104 was able to complete most of its imaging mission. Its orbit, at an epoch of 7 January 1966, had a perigee of 193 kilometres (120 mi), an apogee of 380 kilometres (240 mi) inclination of 65.0° and a period of 90.2 minutes. On 15 January 1966, after eight days in orbit, the satellite was deorbited with its return capsule descending by parachute for a successful recovery by Soviet force.