S-IV
E259959
S-IV was the liquid-fueled second stage of the early Saturn I launch vehicle, powered by a cluster of RL10 engines and used in NASA’s Apollo-era test flights.
All labels observed (4)
| Label | Occurrences |
|---|---|
| S-IV canonical | 1 |
| S-IV stage | 1 |
| Saturn I upper stage | 1 |
| Saturn IB upper stage | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2372454 — 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: S-IV Context triple: [Saturn I, secondStageName, S-IV]
-
A.
S-IVB
The S-IVB was the single-engine upper stage of NASA’s Saturn launch vehicles, used to place Apollo spacecraft into Earth orbit and send them toward the Moon.
-
B.
Saturn V S-II second stage
The Saturn V S-II second stage was the liquid hydrogen–fueled second stage of NASA’s Saturn V Moon rocket, providing the crucial mid-ascent propulsion that enabled Apollo missions to reach Earth orbit and proceed toward the Moon.
-
C.
Inertial Upper Stage
The Inertial Upper Stage was a two-stage, solid-fueled rocket used primarily with the Space Shuttle and Titan launch vehicles to boost satellites from low Earth orbit to higher orbits such as geostationary transfer orbit.
-
D.
J-2
The J-2 was a liquid-fueled rocket engine used on NASA’s Saturn rockets to power upper stages during the Apollo and early Skylab missions.
-
E.
Saturn IB
Saturn IB was a two-stage American launch vehicle used by NASA in the 1960s and early 1970s to test Apollo spacecraft in Earth orbit and support missions such as Apollo–Soyuz.
- 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: S-IV Target entity description: S-IV was the liquid-fueled second stage of the early Saturn I launch vehicle, powered by a cluster of RL10 engines and used in NASA’s Apollo-era test flights.
-
A.
S-IVB
The S-IVB was the single-engine upper stage of NASA’s Saturn launch vehicles, used to place Apollo spacecraft into Earth orbit and send them toward the Moon.
-
B.
Saturn V S-II second stage
The Saturn V S-II second stage was the liquid hydrogen–fueled second stage of NASA’s Saturn V Moon rocket, providing the crucial mid-ascent propulsion that enabled Apollo missions to reach Earth orbit and proceed toward the Moon.
-
C.
Inertial Upper Stage
The Inertial Upper Stage was a two-stage, solid-fueled rocket used primarily with the Space Shuttle and Titan launch vehicles to boost satellites from low Earth orbit to higher orbits such as geostationary transfer orbit.
-
D.
J-2
The J-2 was a liquid-fueled rocket engine used on NASA’s Saturn rockets to power upper stages during the Apollo and early Skylab missions.
-
E.
Saturn IB
Saturn IB was a two-stage American launch vehicle used by NASA in the 1960s and early 1970s to test Apollo spacecraft in Earth orbit and support missions such as Apollo–Soyuz.
- F. None of above. chosen
Statements (30)
| Predicate | Object |
|---|---|
| instanceOf |
launch vehicle upper stage
ⓘ
rocket stage ⓘ |
| agency |
NASA Marshall Space Flight Center (program management)
ⓘ
linked to:
Marshall Space Flight Center
|
| countryOfOrigin |
United States
ⓘ
linked to:
United States of America
|
| engineConfiguration | cluster of RL10 engines ⓘ |
| engineType | RL10 ⓘ |
| era | Apollo era ⓘ |
| firstFlightVehicle |
Saturn I Block II
ⓘ
linked to:
Saturn I
|
| launchVehicleFamily | Saturn ⓘ |
| manufacturer | Douglas Aircraft Company ⓘ |
| numberOfEngines | 6 ⓘ |
| operator | NASA ⓘ |
| oxidizer | liquid oxygen ⓘ |
| partOf | Saturn I ⓘ |
| program |
Saturn I program
ⓘ
linked to:
Saturn I
|
| propellant | liquid hydrogen ⓘ |
| propulsionType | liquid-fueled ⓘ |
| stageNumber | second stage ⓘ |
| status | retired ⓘ |
| successor | S-IVB ⓘ |
| usedFor |
Apollo program test flights
ⓘ
early Saturn I test missions ⓘ orbital test missions ⓘ suborbital test missions ⓘ |
| usedOnLaunchVehicle |
Saturn I SA-10
ⓘ
linked to:
Saturn I
Saturn I SA-5 ⓘ
linked to:
Saturn I
Saturn I SA-6 ⓘ
linked to:
Saturn I
Saturn I SA-7 ⓘ
linked to:
Saturn I
Saturn I SA-8 ⓘ
linked to:
Saturn I
Saturn I SA-9 ⓘ
linked to:
Saturn I
|
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: S-IV Description of subject: S-IV was the liquid-fueled second stage of the early Saturn I launch vehicle, powered by a cluster of RL10 engines and used in NASA’s Apollo-era test flights.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.