|Mission type||Optical imaging reconnaissance|
|Mission duration||8 days|
|Launch mass||4730 kg|
|Start of mission|
|Launch date||4 April 1964, 09:36:00 GMT|
|Rocket||Vostok-2 s/n G15001-04|
|Launch site||Baikonur, 31/6|
|End of mission|
|Landing date||12 April 1964|
|Perigee altitude||213 km|
|Apogee altitude||373 km|
|Epoch||4 April 1964|
Kosmos 28 (Russian: Космос 28 meaning Cosmos 28) or Zenit-2 No.16 was a Soviet, a first generation, low resolution, optical film-return reconnaissance satellite which was launched in 1964. A Zenit-2 spacecraft, Kosmos 28 was the sixteenth of eighty-one such satellites to be launched and had a mass of 4,730 kilograms (10,430 lb).
A Vostok-2 rocket, s/n G15001-04, was used to launch Kosmos 28. The launch took place at 09:36 GMT on 4 April 1964 from Site 31/6 at the Baikonur Cosmodrome. Following its successful arrival in orbit the spacecraft received its Kosmos designation, along with the International Designator 1964-017A and the Satellite Catalog Number 00779.
Kosmos 28 was operated in a low Earth orbit. On 4 April 1964, it had a perigee of 213 kilometres (132 mi), an apogee of 373 kilometres (232 mi), with inclination of 65.0° and an orbital period of 90.4 minutes. On 12 April 1964, the spacecraft was deorbited, with its return capsule descending by parachute for recovery by Soviet forces.