Vanguard 3
E409859
Vanguard 3 was an early American scientific satellite launched in 1959 to study Earth's magnetic field, radiation environment, and upper atmosphere as part of the Vanguard program.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Vanguard 3 canonical | 4 |
| Vanguard 3 satellite | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4012951 — 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: Vanguard 3 Context triple: [Vanguard program, launchedSatellite, Vanguard 3]
-
A.
Vanguard 2
Vanguard 2 is an early American Earth-orbiting satellite, launched in 1959 to measure cloud cover and improve understanding of Earth’s weather and atmospheric conditions.
-
B.
Vanguard TV3
Vanguard TV3 was an early U.S. satellite launch attempt in 1957 that failed to reach orbit, becoming a notable setback in the opening phase of the Space Race.
-
C.
Vanguard 1 satellite
Vanguard 1 satellite is an early American artificial Earth satellite launched in 1958 that became the fourth human-made object in space and the oldest still in orbit, used primarily for geophysical and atmospheric research.
-
D.
Vanguard rocket
The Vanguard rocket was an early American expendable launch vehicle developed in the 1950s to place the first U.S. satellites into orbit during the early years of the Space Race.
-
E.
Pioneer 4
Pioneer 4 was an early U.S. space probe launched in 1959 that became the first American spacecraft to escape Earth's gravity and enter a heliocentric orbit while conducting lunar flyby experiments.
- 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: Vanguard 3 Target entity description: Vanguard 3 was an early American scientific satellite launched in 1959 to study Earth's magnetic field, radiation environment, and upper atmosphere as part of the Vanguard program.
-
A.
Vanguard 2
Vanguard 2 is an early American Earth-orbiting satellite, launched in 1959 to measure cloud cover and improve understanding of Earth’s weather and atmospheric conditions.
-
B.
Vanguard TV3
Vanguard TV3 was an early U.S. satellite launch attempt in 1957 that failed to reach orbit, becoming a notable setback in the opening phase of the Space Race.
-
C.
Vanguard 1 satellite
Vanguard 1 satellite is an early American artificial Earth satellite launched in 1958 that became the fourth human-made object in space and the oldest still in orbit, used primarily for geophysical and atmospheric research.
-
D.
Vanguard rocket
The Vanguard rocket was an early American expendable launch vehicle developed in the 1950s to place the first U.S. satellites into orbit during the early years of the Space Race.
-
E.
Pioneer 4
Pioneer 4 was an early U.S. space probe launched in 1959 that became the first American spacecraft to escape Earth's gravity and enter a heliocentric orbit while conducting lunar flyby experiments.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
Earth-orbiting satellite
ⓘ
artificial satellite ⓘ scientific satellite ⓘ |
| apoapsis | approximately 3,800 kilometers ⓘ |
| carriedInstrument |
Geiger–Müller tube
ⓘ
surface form:
Geiger–Müller tubes
ionization chambers ⓘ magnetometer ⓘ micrometeorite detectors ⓘ radio transmitters ⓘ |
| countryOfOrigin |
United States of America
ⓘ
surface form:
United States
|
| diameter | about 50.8 centimeters ⓘ |
| discovererOrDeveloper | Naval Research Laboratory ⓘ |
| epochOfOrbit | late 1959 ⓘ |
| followedBy | later American scientific satellites ⓘ |
| launchComplex |
Launch Complex 18
ⓘ
surface form:
Launch Complex 18A
|
| launchDate | 1959-09-18 ⓘ |
| launchOutcome | success ⓘ |
| launchSite |
Cape Canaveral
ⓘ
Cape Canaveral Space Force Station ⓘ
surface form:
Cape Canaveral Air Force Station
|
| launchVehicle | Vanguard rocket ⓘ |
| mass | about 22.7 kilograms ⓘ |
| missionObjective |
measure micrometeorite impacts
ⓘ
measure solar X-rays effects ⓘ measure trapped radiation ⓘ study Earth’s magnetic field ⓘ study Earth’s radiation environment ⓘ study Earth’s upper atmosphere ⓘ |
| missionType |
geophysics research
ⓘ
magnetospheric research ⓘ upper atmosphere research ⓘ |
| operator |
Naval Research Laboratory
ⓘ
United States Navy ⓘ |
| orbitInclination | about 33.4 degrees ⓘ |
| orbitPeriod | about 130 minutes ⓘ |
| orbitReference | geocentric orbit ⓘ |
| orbitRegime | highly elliptical orbit ⓘ |
| partOf | early United States space program ⓘ |
| periapsis | approximately 510 kilometers ⓘ |
| powerSource |
chemical batteries
ⓘ
solar cells ⓘ |
| precededBy | Vanguard 2 ⓘ |
| program | Vanguard program ⓘ |
| shape | spherical ⓘ |
| spacecraftBus | Vanguard series bus ⓘ |
| status | in orbit ⓘ |
| usedFor |
characterizing Van Allen radiation belts
ⓘ
mapping Earth’s magnetic field ⓘ studying upper atmospheric density ⓘ |
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: Vanguard 3 Description of subject: Vanguard 3 was an early American scientific satellite launched in 1959 to study Earth's magnetic field, radiation environment, and upper atmosphere as part of the Vanguard program.
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Vanguard 3 satellite