Soyuz T-4

Soyuz T-4 was a Soviet space mission which launched the crew of Salyut 6 EO-6, the sixth and final long-duration crew of the Salyut 6 space station. It was launched on 12 March 1981 and docked with the station the next day.^[2] During their stay, the EO-6 crew was visited by Soyuz 39 and Soyuz 40. Soyuz T-4 returned to Earth on 26 May 1981.

Crew

Position	Crew
Commander	Vladimir Kovalyonok Third spaceflight
Flight Engineer	Viktor Savinykh First spaceflight

Backup crew

Position	Crew
Commander	Vyacheslav Zudov
Flight Engineer	Boris Andreyev

Mission parameters

Mass: 6850 kg
Perigee: 201 km
Apogee: 250 km
Inclination: 51.6°
Period: 88.7 minutes

Mission highlights

The docking with Salyut 6 was delayed after the Soyuz's onboard Argon computer determined it would occur outside radio range with the TsUP. Despite this, the docking occurred successfully on 13 March 1981. The Progress 12 spacecraft was already docked to the station by the time the crew arrived, and they spent several days unloading the Progress before its undocking on 19 March.^[2] This freed the remaining docking port for the arrival of the Soyuz 39/EP-9 crew on 22 March.

In mid-May, Kovalyonok and Savinykh replaced the spacecraft's probe with a Salyut drogue. This may have been an experiment to see if a Soyuz-T docked to a space station could act as a rescue vehicle in the event that an approaching Soyuz-T equipped with a probe experienced docking difficulties and could not return to Earth.^[2]

The EO-6 crew undocked from Salyut 6 on 26 May, leaving behind the Soyuz's orbital module. Soyuz T-4 landed over three hours later, touching down 125 kilometres (78 mi) east of Dzhezkazgan, Kazakh SSR.^[2]

References

1 2 McDowell, Jonathan. "SATCAT". Jonathan's Space Pages. Retrieved 24 March 2014.
1 2 3 4 5 6 "Soyuz T-4". Spacefacts. 24 November 2013. Retrieved 24 March 2014.

Soyuz programme

Main topics

Uncrewed
missions

Soyuz 7K-OK	Kosmos 133 Kosmos 140 Kosmos 186 Kosmos 188 Kosmos 212 Kosmos 213 Kosmos 238 Soyuz 2

Soyuz 7K-L1/L1S (Zond lunar programme)	Kosmos 146 Kosmos 154 Zond 1967A Zond 1967B Zond 4 Zond 1968A Zond 1968B Zond 5 Zond 6 Zond 1969A Zond-M 1 Zond-M 2 Zond 7 Zond 8 Zond 9 Zond 10

Soyuz 7K-T	Kosmos 496 Kosmos 573 Kosmos 613 Kosmos 656 Soyuz 32 (uncrewed landing) Soyuz 34 (uncrewed launch)

Soyuz 7K-TM	Kosmos 638 Kosmos 672

Soyuz 7K-S	Kosmos 670 Kosmos 772 Kosmos 869

Soyuz 7K-T/A9	Soyuz 20

Soyuz-T ("Soyuz 7K-ST")	Kosmos 1001 Kosmos 1074 Soyuz T-1

Soyuz-TM ("Soyuz 7K-STM")	Soyuz TM-1

Crewed
missions

Past

Soyuz 7K-OK (1967–1970)	1 3 4 5 6 7 8 9

Soyuz 7K-OKS (1971)	10 11

Soyuz 7K-T (1973–1981)	12 13 14 15 17 18a 18 21 23 24 25 26 27 28 29 30 31 32 (crewed launch) 33 34 (crewed landing) 35 36 37 38 39 40

Soyuz 7K-TM (1974–1976)	16 19 22

Soyuz-T (1976–1986)	T-2 T-3 T-4 T-5 T-6 T-7 T-8 T-9 T-10-1 T-10 T-11 T-12 T-13 T-14 T-15

Soyuz-TM (1986–2003)	TM-2 TM-3 TM-4 TM-5 TM-6 TM-7 TM-8 TM-9 TM-10 TM-11 TM-12 TM-13 TM-14 TM-15 TM-16 TM-17 TM-18 TM-19 TM-20 TM-21 TM-22 TM-23 TM-24 TM-25 TM-26 TM-27 TM-28 TM-29 TM-30 TM-31 TM-32 TM-33 TM-34

Soyuz-TMA (2003–2012)	TMA-1 TMA-2 TMA-3 TMA-4 TMA-5 TMA-6 TMA-7 TMA-8 TMA-9 TMA-10 TMA-11 TMA-12 TMA-13 TMA-14 TMA-15 TMA-16 TMA-17 TMA-18 TMA-19 TMA-20 TMA-21 TMA-22

Soyuz-TMA-M (2010–2016)	TMA-01M TMA-02M TMA-03M TMA-04M TMA-05M TMA-06M TMA-07M TMA-08M TMA-09M TMA-10M TMA-11M TMA-12M TMA-13M TMA-14M TMA-15M TMA-16M TMA-17M TMA-18M

Current

Soyuz-TMA-M (2016)	TMA-19M TMA-20M

Planned

Soyuz-MS (2016–present)	MS-01 MS-02 MS-03 MS-04 MS-05 MS-06

← 1980 · Orbital launches in 1981 · 1982 →

Kosmos 1237 \| Molniya-3 No.25 \| Kosmos 1238 \| Kosmos 1239 \| Kosmos 1240 \| Kosmos 1241 \| Musson No.11 \| Progress 12 \| Kosmos 1242 \| Molniya 1-49 \| Kosmos 1243 \| Interkosmos 21 \| Kiku 3 \| Kosmos 1244 \| Kosmos 1245 \| Kosmos 1246 \| Kosmos 1247 \| Hinotori \| Comstar D4 \| OPS 1166 \| Kosmos 1248 \| Kosmos 1249 \| Kosmos 1250 · Kosmos 1251 · Kosmos 1252 · Kosmos 1253 · Kosmos 1254 · Kosmos 1255 · Kosmos 1256 · Kosmos 1257 \| Soyuz T-4 \| Kosmos 1258 \| OPS 7350 \| Kosmos 1259 \| Gran' No.18L \| Kosmos 1260 \| Soyuz 39 \| Molniya-3 No.24 \| Yantar-2K No.979 \| Kosmos 1261 \| Kosmos 1262 \| Kosmos 1263 \| STS-1 \| Kosmos 1264 \| Kosmos 1265 \| Kosmos 1266 \| OPS 7225 \| Kosmos 1267 \| Kosmos 1268 \| Kosmos 1269 \| Soyuz 40 \| Meteor-2 No.8 \| Nova-1 \| Kosmos 1270 \| Kosmos 1271 \| Kosmos 1272 \| Kosmos 1273 \| GOES 5 \| Intelsat V F-1 \| Rohini RS-D1 \| Kosmos 1274 \| Kosmos 1275 \| Molniya-3 No.30 \| Kosmos 1276 \| Kosmos 1277 \| Meteosat 2 · APPLE · CAT-3 \| Kosmos 1278 \| NOAA-7 \| Molniya 1-50 \| Ekran No.21L \| Kosmos 1279 \| Kosmos 1280 \| Kosmos 1281 \| Meteor-Priroda 2-4 · Iskra 1 \| Kosmos 1282 \| Kosmos 1283 \| Kosmos 1284 \| Gran' No.19L \| DE-1 · DE-2 \| Kosmos 1285 \| Kosmos 1286 \| FLTSATCOM 5 \| Kosmos 1287 · Kosmos 1288 · Kosmos 1289 · Kosmos 1290 · Kosmos 1291 · Kosmos 1292 · Kosmos 1293 · Kosmos 1294 \| Bulgaria 1300 \| Himawari 2 \| Kosmos 1295 \| Kosmos 1296 \| Kosmos 1297 \| Kosmos 1298 \| Kosmos 1299 \| Kosmos 1300 \| Kosmos 1301 \| Kosmos 1302 \| OPS 3984 \| Kosmos 1303 \| Kosmos 1304 \| Kosmos 1305 \| Kosmos 1306 \| Kosmos 1307 \| Kosmos 1308 \| Kosmos 1309 \| Shijian 2 · Shijian 2-01 · Shijian 2-02 \| Oreol 3 \| Kosmos 1310 \| SBS-2 \| Kosmos 1311 \| Kosmos 1312 \| Kosmos 1313 \| SME · UoSAT-1 \| Kosmos 1314 \| Gran' No.20L \| Kosmos 1315 \| Kosmos 1316 \| Molniya-3 No.31 \| Venera 13 \| OPS 4029 \| Kosmos 1317 \| Kosmos 1318 \| Venera 14 \| STS-2 \| Kosmos 1319 \| Molniya 1-51 \| Satcom 3R \| Bhaskara 2 \| Kosmos 1320 · Kosmos 1321 · Kosmos 1322 · Kosmos 1323 · Kosmos 1324 · Kosmos 1325 · Kosmos 1326 · Kosmos 1327 \| Kosmos 1328 \| Kosmos 1329 \| Intelsat V F-3 \| RS-3 · RS-4 · RS-5 · RS-6 · RS-7 · RS-8 \| Navstar 7 \| Kosmos 1330 \| MARECS-1 · CAT-4 \| Molniya-1 No.55

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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