Soyuz 21
E883030
Soyuz 21 was a 1976 Soviet crewed spaceflight that transported cosmonauts to the Salyut 5 space station for a long-duration military-related mission.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Soyuz 21 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T10691936 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Soyuz 21 Context triple: [Soyuz 19, followedBy, Soyuz 21]
-
A.
Soyuz T-15
Soyuz T-15 was a Soviet crewed spacecraft mission notable for inaugurating operations on the Mir space station while also visiting the aging Salyut 7 station in a unique dual-docking flight.
-
B.
Soyuz 18
Soyuz 18 was a Soviet crewed spacecraft mission in the mid-1970s that experienced a serious launch abort and is often noted for its dramatic emergency reentry and safe recovery of the cosmonauts.
-
C.
Soyuz 19
Soyuz 19 was the Soviet spacecraft that participated in the historic 1975 Apollo–Soyuz Test Project, enabling the first international crewed space docking between the USSR and the United States.
-
D.
Salyut 7
Salyut 7 was a Soviet-era modular space station that served as one of the last and most advanced stations in the Salyut program, paving the way for the later Mir space station.
-
E.
Soyuz TM-21
Soyuz TM-21 was a Russian crewed spacecraft mission notable for carrying U.S. astronaut Norman E. Thagard to the Mir space station as part of early Shuttle-Mir cooperation.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Soyuz 21 Target entity description: Soyuz 21 was a 1976 Soviet crewed spaceflight that transported cosmonauts to the Salyut 5 space station for a long-duration military-related mission.
-
A.
Soyuz T-15
Soyuz T-15 was a Soviet crewed spacecraft mission notable for inaugurating operations on the Mir space station while also visiting the aging Salyut 7 station in a unique dual-docking flight.
-
B.
Soyuz 18
Soyuz 18 was a Soviet crewed spacecraft mission in the mid-1970s that experienced a serious launch abort and is often noted for its dramatic emergency reentry and safe recovery of the cosmonauts.
-
C.
Soyuz 19
Soyuz 19 was the Soviet spacecraft that participated in the historic 1975 Apollo–Soyuz Test Project, enabling the first international crewed space docking between the USSR and the United States.
-
D.
Salyut 7
Salyut 7 was a Soviet-era modular space station that served as one of the last and most advanced stations in the Salyut program, paving the way for the later Mir space station.
-
E.
Soyuz TM-21
Soyuz TM-21 was a Russian crewed spacecraft mission notable for carrying U.S. astronaut Norman E. Thagard to the Mir space station as part of early Shuttle-Mir cooperation.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf | crewed spaceflight ⓘ |
| apoapsis | ~350 km (approximate station orbit) ⓘ |
| callSign | “Baikal” NERFINISHED ⓘ |
| commander | Boris Volynov NERFINISHED ⓘ |
| countryOfOrigin | Soviet Union ⓘ |
| crewMember |
Boris Volynov
NERFINISHED
ⓘ
Vitaly Zholobov NERFINISHED ⓘ |
| crewNationality | Soviet ⓘ |
| crewSize | 2 ⓘ |
| crewTransportRole | transported crew to Salyut 5 ⓘ |
| dockingDate | 1976-07-07 ⓘ |
| earlyTermination | yes ⓘ |
| earlyTerminationReason | crew health and environmental concerns on Salyut 5 ⓘ |
| flightEngineer | Vitaly Zholobov NERFINISHED ⓘ |
| followedBy | Soyuz 22 NERFINISHED ⓘ |
| inclination | ~51.6 degrees ⓘ |
| isPartOf | Salyut 5 long-duration expedition 1 NERFINISHED ⓘ |
| landingCountry | Soviet Union NERFINISHED ⓘ |
| landingDate | 1976-08-24 ⓘ |
| landingSite | Kazakh SSR NERFINISHED ⓘ |
| launchComplex | Baikonur Cosmodrome Site 1/5 NERFINISHED ⓘ |
| launchDate | 1976-07-06 ⓘ |
| launchSite | Baikonur Cosmodrome NERFINISHED ⓘ |
| launchVehicle | Soyuz-U NERFINISHED ⓘ |
| launchYear | 1976 ⓘ |
| missionDuration |
48 days
ⓘ
~1180 hours ⓘ |
| missionType |
long-duration space station mission
ⓘ
military-related mission ⓘ |
| operator | Soviet space program NERFINISHED ⓘ |
| orbitRegime | low Earth orbit ⓘ |
| periapsis | ~260 km (approximate station orbit) ⓘ |
| precededBy | Soyuz 20 NERFINISHED ⓘ |
| primaryObjective |
Earth observation
ⓘ
life sciences experiments ⓘ long-duration occupancy of Salyut 5 ⓘ materials science experiments ⓘ military reconnaissance experiments ⓘ |
| program | Soyuz program NERFINISHED ⓘ |
| returnTransportRole | returned crew from Salyut 5 ⓘ |
| spacecraftMassClass | ~6.8 metric tons (approximate for Soyuz 7K-T) ⓘ |
| spacecraftType | Soyuz 7K-T NERFINISHED ⓘ |
| spaceStationDocking | Salyut 5 NERFINISHED ⓘ |
| spaceStationProgram |
Almaz military space station program
ⓘ
Salyut program NERFINISHED ⓘ |
| spaceStationVisited | Salyut 5 NERFINISHED ⓘ |
| spaceStationVisitedInstanceOf | Almaz military space station ⓘ |
| undockingDate | 1976-08-24 ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Soyuz 21 Description of subject: Soyuz 21 was a 1976 Soviet crewed spaceflight that transported cosmonauts to the Salyut 5 space station for a long-duration military-related mission.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.