Service Propulsion System
E256003
The Service Propulsion System was the main rocket engine of the Apollo Service Module, used for major course corrections, lunar orbit insertion, and trans-Earth injection during Apollo missions.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Service Propulsion System canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2330350 — 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: Service Propulsion System Context triple: [Apollo 12, serviceModuleEngine, Service Propulsion System]
-
A.
Space Shuttle Main Engines
The Space Shuttle Main Engines were highly efficient, reusable liquid-fuel rocket engines that powered NASA’s Space Shuttle orbiters during launch and ascent into space.
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B.
Orbital Maneuvering System
The Orbital Maneuvering System was the Space Shuttle’s pair of rear-mounted rocket engines used for orbital insertion, adjustment, and deorbit burns.
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C.
Space Propulsion Laboratory
The Space Propulsion Laboratory is an MIT research lab specializing in advanced spacecraft propulsion technologies, particularly electric and micro-propulsion systems for space missions.
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D.
Draco thrusters
Draco thrusters are small hypergolic rocket engines developed by SpaceX to provide attitude control and orbital maneuvering for its spacecraft.
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E.
Space Systems
Space Systems is a Northrop Grumman business segment focused on developing and producing spacecraft, launch systems, and related space technologies for civil, military, and commercial customers.
- 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: Service Propulsion System Target entity description: The Service Propulsion System was the main rocket engine of the Apollo Service Module, used for major course corrections, lunar orbit insertion, and trans-Earth injection during Apollo missions.
-
A.
Space Shuttle Main Engines
The Space Shuttle Main Engines were highly efficient, reusable liquid-fuel rocket engines that powered NASA’s Space Shuttle orbiters during launch and ascent into space.
-
B.
Orbital Maneuvering System
The Orbital Maneuvering System was the Space Shuttle’s pair of rear-mounted rocket engines used for orbital insertion, adjustment, and deorbit burns.
-
C.
Space Propulsion Laboratory
The Space Propulsion Laboratory is an MIT research lab specializing in advanced spacecraft propulsion technologies, particularly electric and micro-propulsion systems for space missions.
-
D.
Draco thrusters
Draco thrusters are small hypergolic rocket engines developed by SpaceX to provide attitude control and orbital maneuvering for its spacecraft.
-
E.
Space Systems
Space Systems is a Northrop Grumman business segment focused on developing and producing spacecraft, launch systems, and related space technologies for civil, military, and commercial customers.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
rocket engine
ⓘ
spacecraft propulsion system ⓘ |
| combustionCycle | pressure-fed ⓘ |
| controlledBy |
Apollo Guidance Computer
ⓘ
Service Module reaction control system valves ⓘ |
| countryOfOrigin |
United States of America
ⓘ
surface form:
United States
|
| designedFor |
deep-space operations
ⓘ
high-reliability crewed missions ⓘ |
| developedBy |
Aerojet Rocketdyne
ⓘ
surface form:
Aerojet
|
| fuel | Aerozine 50 ⓘ |
| heritage | Aerojet AJ10 engine family ⓘ |
| locatedIn | Service Module engine bay ⓘ |
| missionPhase |
abort-to-Earth maneuvers
ⓘ
lunar orbit departure burns ⓘ lunar orbit insertion burns ⓘ midcourse corrections ⓘ translunar injection corrections ⓘ |
| mountingLocation | rear of Apollo Service Module ⓘ |
| nozzleType | fixed nozzle ⓘ |
| operatedBy | NASA ⓘ |
| operator |
Johnson Space Center
ⓘ
surface form:
NASA Manned Spacecraft Center
|
| oxidizer | nitrogen tetroxide ⓘ |
| partOf |
Apollo command and service module
ⓘ
surface form:
Apollo Service Module
|
| primaryFunction | service module main propulsion ⓘ |
| propellantType | hypergolic ⓘ |
| restartCapability | multiple restarts ⓘ |
| safetyFeature |
hypergolic ignition reliability
ⓘ
pressure-fed simplicity ⓘ |
| status | retired ⓘ |
| throttleCapability | non-throttleable ⓘ |
| usedFor |
lunar orbit insertion
ⓘ
major course corrections ⓘ trans-Earth injection ⓘ |
| usedInProgram | Apollo program ⓘ |
| usedOnMission |
Apollo 10
ⓘ
Apollo 11 ⓘ Apollo 12 ⓘ Apollo 13 ⓘ Apollo 14 ⓘ Apollo 15 ⓘ Apollo 16 ⓘ Apollo 17 ⓘ Apollo 7 ⓘ Apollo 8 ⓘ Apollo 9 ⓘ Apollo–Soyuz Test Project ⓘ |
| usedOnMissionType | crewed lunar missions ⓘ |
| usedOnVehicle |
Apollo command and service module
ⓘ
surface form:
Apollo Command and Service Module
|
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: Service Propulsion System Description of subject: The Service Propulsion System was the main rocket engine of the Apollo Service Module, used for major course corrections, lunar orbit insertion, and trans-Earth injection during Apollo missions.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.