| Kosmos 633 | |
| Mission Type: | ABM radar target |
| Cospar Id: | 1974-010A |
| Spacecraft Type: | DS-P1-Yu |
| Manufacturer: | Yuzhnoye |
| Launch Date: | UTC |
| Launch Rocket: | Kosmos-2I 63SM |
| Launch Site: | Plesetsk 133/1 |
| Orbit Reference: | Geocentric |
| Orbit Regime: | Low Earth |
| Orbit Inclination: | 70.9 degrees |
| Orbit Period: | 91.9 minutes |
| Apsis: | gee |
Kosmos 633 (Russian: Космос 633 meaning Cosmos 633), also known as DS-P1-Yu No.71, was a Soviet satellite which was launched in 1974 as part of the Dnepropetrovsk Sputnik programme. It was a 400kg (900lb) spacecraft, which was built by the Yuzhnoye Design Bureau, and was used as a radar calibration target for anti-ballistic missile tests.[1]
The launch of Kosmos 633 occurred at 11:05 UTC on 27 February 1974, and resulted in the satellite successfully reaching low Earth orbit.[2] The launch took place from Site 133/1 at the Plesetsk Cosmodrome,[3] and used a Kosmos-2I 63SM carrier rocket. Upon reaching orbit, the satellite was assigned its Kosmos designation, and received the International Designator 1974-010A.[4] The North American Aerospace Defense Command assigned it the catalogue number 07187.
Kosmos 633 was the sixty-eighth of seventy nine DS-P1-Yu satellites to be launched,[1] and the sixty-second of seventy two to successfully reach orbit.[5] It was operated in an orbit with a perigee of, an apogee of, 70.9 degrees of inclination, and an orbital period of 91.9 minutes. It remained in orbit until it decayed and reentered the atmosphere on 4 October 1974.[6]