| Station: | DOS-2 |
| Insignia: | Salyut_program_insignia.svg |
| Insignia Size: | 160px |
| Crew: | 2 |
| Mass: | 18,425 kg (40,620 lb) |
| Length: | 14 m |
| Width: | 4.15 m |
| Volume: | c.100 m³ (3,500 ft³) |
| In Orbit: | 0 days (Launch failure) |
| Stats Ref: | [1] |
| Configuration Image: | RP1357 p64 Salyut 1.svg |
| Configuration Caption: | Planned orbital configuration of DOS-2 |
DOS-2 was a space station, launched as part of the Salyut programme, which was lost in a launch failure on 29 July 1972, when the failure of the second stage of its Proton-K launch vehicle prevented the station from achieving orbit.[2] [3] It instead fell into the Pacific Ocean. The station, which would have been given the designation Salyut 2 had it reached orbit, was structurally identical to Salyut 1, as it had been assembled as a backup unit for that station.[4] Four teams of cosmonauts were formed to crew the station, of which two would have flown:[4]
Whilst Salyut 1 had been attempted to be visited by two three-person crews (Soyuz 10 and Soyuz 11), following modifications to the Soyuz 7KT-OK spacecraft (resulting in the new model Soyuz 7K-T) following the deaths of the crew of Soyuz 11, the spacecraft could only carry two cosmonauts, thus DOS-2 would have had two crews of two. Following the loss of the station, the crews were transferred to the DOS-3 programme.[4]