| Kosmos 25 | |
| Mission Type: | ABM Radar target Technology |
| Cospar Id: | 1964-010A |
| Satcat: | 00757 |
| Mission Duration: | 268 days |
| Spacecraft Type: | DS-P1 |
| Manufacturer: | Yuzhnoye |
| Launch Mass: | 355 kg[1] |
| Launch Date: | 27 February 1964, 13:26:00 GMT |
| Launch Rocket: | Kosmos-2I 63S1 |
| Launch Site: | Kapustin Yar, Mayak-2 |
| Launch Contractor: | Yuzhnoye |
| Decay Date: | 21 November 1964 |
| Orbit Epoch: | 27 February 1964 |
| Orbit Reference: | Geocentric[2] |
| Orbit Regime: | Low Earth |
| Orbit Periapsis: | 255 km |
| Orbit Apoapsis: | 526 km |
| Orbit Inclination: | 49.0° |
| Orbit Period: | 92.3 minutes |
| Apsis: | gee |
Kosmos 25 (Russian: Космос 25 meaning Cosmos 25), also known as DS-P1 No.4 was a prototype radar target satellite for anti-ballistic missile tests, which was launched by the Soviet Union in 1964 as part of the Dnepropetrovsk Sputnik programme. Its primary mission was to demonstrate the necessary technologies for radar tracking of spacecraft, which would allow future satellites to function as targets.[3]
It was launched aboard a Kosmos-2I 63S1 rocket,[4] from Mayak-2 at Kapustin Yar. The launch occurred at 13:26 GMT on 27 February 1964.[5]
Kosmos 25 was placed into a low Earth orbit with a perigee of, an apogee of, 49.0° of inclination, and an orbital period of 92.3 minutes.[3] It decayed from orbit on 21 November 1964.[6]
Kosmos 25 was a prototype DS-P1 satellite, the last of four to be launched.[3] Of these, it was the third to successfully reach orbit after Kosmos 6 and Kosmos 19.[7] It was succeeded by the first operational DS-P1 satellite, Kosmos 36.