| Kosmos 28 | |
| Names List: | Zenit 2-16 |
| Mission Type: | Optical imaging reconnaissance |
| Operator: | Soviet space program |
| Cospar Id: | 1964-017A |
| Satcat: | 779 |
| Mission Duration: | 8 days |
| Spacecraft Type: | Zenit-2 |
| Manufacturer: | OKB-1 |
| Launch Mass: | 4730 kg[1] |
| Launch Date: | 4 April 1964, 09:36:00 GMT |
| Launch Rocket: | Vostok-2 |
| Launch Site: | Baikonur 31/6 |
| Launch Contractor: | OKB-1 |
| Disposal Type: | Recovered |
| Landing Date: | 12 April 1964 |
| Orbit Epoch: | 4 April 1964 |
| Orbit Reference: | Geocentric[2] |
| Orbit Regime: | Low Earth |
| Orbit Periapsis: | 213 km |
| Orbit Apoapsis: | 373 km |
| Orbit Inclination: | 65.0° |
| Orbit Period: | 90.4 minutes |
| Apsis: | gee |
| Programme: | Zenit programme Zenit-2 |
| Previous Mission: | Zenit 2-15 |
| Next Mission: | Zenit 2-17 |
| Programme2: | Kosmos (satellites) |
| Previous Mission2: | Kosmos 27 |
| Next Mission2: | Kosmos 29 |
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[3] [4] and had a mass of 4730kg (10,430lb).
A Vostok-2 rocket, s/n G15001-04,[5] 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.[6] 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 213km (132miles), an apogee of 373km (232miles), 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.[7] [4]