1974-104A
DOS 4 (17K No. 124) was launched on 1974 Dec 26 and named Salyut-4. This was the first fully successful Soviet space station. Three expeditions were sent to the station: Soyuz-17 (D-4-1 crew), docked to the station for 28d04h43m, the D-4-2 crew aboard the Apr 1975 Soyuz launch abort, and the D-4-3 crew on Soyuz-18 which set a 63-day duration record (docked for 61d16h27m). Following this, the automated Soyuz-20 flight demonstrated automatic rendezvous and docking with a DOS station, proving technology needed for the Progress missions to DOS 5 (Salyut-6).
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| Salyut-4 |
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| Date | Time | Event | Orbit |
|---|
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| 1974 Dec 26 | 0415 | Launch by Proton-K | KB |
| | | Stage 1 sep |
| | | Stage 2 sep |
| | 0420? | Stage 3 burn |
| | 0424? | Stage 3 MECO |
| | 0425? | Sep from 8S812 stage | 212 x 252 x 51.6 |
| | | 104C,D cataloged |
| 1974 Dec 27 | | | 211 x 250 x 51.6 |
| | | | 215 x 286 x 51.6 |
| 1974 Dec 29 | | | 211 x 284 x 51.6 |
| | | Orbit raise | 276 x 344 x 51.6 |
| 1974 Dec 30 | | | 277 x 342 x 51.6 |
| | | Orbit raise | 329 x 360 x 51.6 |
| | | Orbit raise | 338 x 351 x 51.6 |
| 1975 Jan 11 | | | 337 x 348 x 51.6 |
| | | | 336 x 349 x 51.6 |
| 1975 Jan 12 | 0125 | Soyuz-17 docked |
| | | Crew entry |
| | | D-4-1 Kdr: Aleksey A. Gubarev |
| | | D-4-1 BI: Georgiy M. Grechko |
| 1975 Jan 13 | | | 337 x 349 x 51.6 |
| 1975 Jan 17 | | 104E cataloged (102d) |
| 1975 Jan 20 | | 01C cataloged (64d) |
| 1975 Jan 21 | | 01D,E cataloged (81, 107d) |
| 1975 Jan 23 | | 01F cataloged (274d) |
| 1975 Jan 30 | | 104F cataloged (68d) |
| 1975 Jan 30 | | 104G cataloged (75d) |
| 1975 Feb 5 | | 01G, H, J, 104H cataloged |
| 1975 Feb 9 | | | 336 x 347 x 51.6 |
| | | | 335 x 348 x 51.6 |
| | 0608 | Soyuz-17 undocked |
| 1975 Feb 10 | | 104J,K,L,M,N cataloged |
| 1975 Feb 28 | | | 331 x 345 x 51.6 |
| | | | 332 x 344 x 51.6 |
| 1975 Mar 22 | | | 330 x 341 x 51.6 |
| | | | 337 x 350 x 51.6 |
| 1975 Mar 25 | | 104P cataloged |
| 1975 Apr 1 | | | 337 x 349 x 51.6 |
| | | Orbit trim | 339 x 351 x 51.6 |
| 1975 May 14 | | | 337 x 349 x 51.6 |
| | | | 348 x 355 x 51.6 |
| 1975 May 22 | | | 347 x 354 x 51.6 |
| | | Orbit trim | 343 x 351 x 51.6 |
| 1975 May 25 | 1829 | Soyuz-18 docked |
| | 2130 | Crew entry |
| | | D-4-3 Kdr: Pyotr I Klimuk |
| | | D-4-3 BI: Vitaliy Sevastyanov |
| 1975 Jun 5 | | 44C,D cataloged |
| 1975 Jun 14 | | 44E to K cataloged |
| 1975 Jun 24 | | 44L cataloged |
| 1974 Jun 28 | | 104S ejected, long lived |
| 1975 Jun 30 | | 104Q-T cataloged |
| 1975 Jul 10 | | 44M-T cataloged |
| 1975 Jul 17 | | 44U cataloged |
| 1975 Jul 25 | | | 335 x 344 x 51.6 |
| | | Orbit raise | 335 x 360 x 51.6 |
| 1975 Jul 26 | | | 342 x 361 x 51.6 |
| | | 104U cataloged |
| | | Crew transfer to Soyuz-18 |
| | 1056 | Soyuz-18 undocked |
| 1975 Nov 4 | | | 335 x 344 x 51.6 |
| | | Orbit raise | 344 x 363 x 51.6 |
| 1975 Nov 19 | | Soyuz-20 docked |
| 1975 Nov 20 | | | 352 x 351 x 51.6 |
| 1976 Feb 15 | | | 336 x 343 x 51.6 |
| | | Soyuz-20 test burn | 335 x 342 x 51.6 |
| 1976 Feb 16 | | Soyuz-20 undocked |
| 1976 Oct 9 | | | 299 x 300 x 51.6 |
| 1977 Jan 1 | | | 252 x 256 x 51.6 |
| 1977 Feb 2 | | | 186 x 187 x 51.6 |
| | | Deorbited over Pacific |
| | 2332? | Deorbit |
| | 2350? | Entry? |
| | 2355? | Impact? |