DOS-2
DOS-2 designation given to 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. 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.[1] Four teams of cosmonauts were formed to crew the station, of which two would have flown:[1]
Whilst Salyut 1 has been visited by two three-man 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 been manned by two crews of two. Following the loss of the station, the crews were transferred to the DOS-3 programme.[1]
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| Active | |
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| Defunct | Soviet Union and Russia | |
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| United States | |
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| Cancelled | |
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| ISS-incorporated | |
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| Developmental | |
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| Proposed | |
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| Notes: † Never inhabited due to launch or on-orbit failure, ‡ Part of the Almaz military program, ° Never inhabited, lacks docking mechanism. |
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| Kosmos 471 | OPS 1737 · OPS 7719 | Intelsat IV F-4 | Kosmos 472 | HEOS-2 | Kosmos 473 | Luna 20 | Kosmos 474 | OPS 1844 | Kosmos 475 | OPS 1570 | Kosmos 476 | Pioneer 10 | Kosmos 477 · Nauka-14KS No.1 | TD-1A | Kosmos 478 | OPS 1678 | Kosmos 479 | OPS 5058 | Kosmos 480 | Kosmos 481 | Venera 8 | Meteor-MV No.23 | Kosmos 482 | Kosmos 483 | Molniya-1 No.27 · SRET-1 | Kosmos 484 · Nauka-5KS No.3 | Interkosmos 6 | Kosmos 485 | Prognoz 1 | Kosmos 486 | Apollo 16 (PFS-2) | OPS 5640 | Kosmos 487 | DS-P1-Yu No. 51 | Kosmos 488 | Kosmos 489 | Kosmos 490 · Nauka-1KS No.5 | Molniya-2-2 | OPS 6574 | Kosmos 491 | OPS 6371 | Kosmos 492 | Intelsat IV F-5 | Kosmos 493 | Kosmos 494 | Kosmos 495 | Kosmos 496 | Prognoz 2 | Interkosmos 7 | Kosmos 497 | Meteor-MV No.26 | Kosmos 498 | Kosmos 499 | OPS 7293 · OPS 7803 | Kosmos 500 | Kosmos 501 | Kosmos 502 | Kosmos 503 | Kosmos 504 · Kosmos 505 · Kosmos 506 · Kosmos 507 · Kosmos 508 · Kosmos 509 · Kosmos 510 · Kosmos 511 | ERTS-1 | Kosmos 512 | DOS No.122 | Kosmos 513 | Explorer 46 | Kosmos 514 | Kosmos 515 | Denpa | Copernicus | Kosmos 516 | Kosmos 517 | OPS 8888 | Unnamed | Triad 1 | Kosmos 518 | Kosmos 519 | Kosmos 520 | Explorer 47 | Kosmos 521 | Molniya-2-3 | Radcat 2 · Radsat | Kosmos 522 | Kosmos 523 | OPS 8314 · OPS 8314/2 | Kosmos 524 | Molniya-1 No.26 | NOAA-2 · OSCAR-6 | Unnamed | Kosmos 525 · Nauka-16KS No.1L | Kosmos 526 | Meteor-M No.25 | Kosmos 527 | Kosmos 528 · Kosmos 529 · Kosmos 530 · Kosmos 531 · Kosmos 532 · Kosmos 533 · Kosmos 534 · Kosmos 535 | Kosmos 536 | OPS 7323 | Anik A1 | Explorer 48 | ESRO-4 | Unnamed | Kosmos 537 | Interkosmos 8 | Molniya-1 No.28 | Apollo 17 | Nimbus 5 | Molniya-2-4 | Kosmos 538 | Aeros 1 | OPS 9390 | Kosmos 539 | OPS 3978 | Kosmos 540 | Kosmos 541 | Kosmos 542 | | Payloads are separated by bullets ( · ), launches by pipes ( | ). Manned flights are indicated in bold text. Uncatalogued launch failures are listed in italics. Payloads deployed from other spacecraft are denoted in (brackets). |
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