Apollo 15 subsatellite
E867326
The Apollo 15 subsatellite (PFS-1) was a small scientific satellite released into lunar orbit by the Apollo 15 mission to study the Moon’s gravitational and magnetic fields.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Apollo 15 subsatellite canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T10501667 — 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: Apollo 15 subsatellite Context triple: [PFS-1, alternativeName, Apollo 15 subsatellite]
-
A.
Luna spacecraft
The Luna spacecraft were a series of Soviet robotic probes launched between the late 1950s and 1970s that achieved many lunar exploration firsts, including the first human-made object to reach the Moon and the first soft landing on its surface.
-
B.
SLIM lunar lander
The SLIM lunar lander is a Japanese spacecraft designed by JAXA to demonstrate high-precision, lightweight landing technology on the Moon’s surface.
-
C.
Altair lunar lander
The Altair lunar lander was NASA’s planned next-generation crewed spacecraft for landing astronauts on the Moon as part of the post-Apollo Constellation program.
-
D.
Luna 11
Luna 11 was a Soviet unmanned spacecraft from the Luna program, launched in 1966 to study the Moon from lunar orbit.
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E.
Moon Impact Probe
The Moon Impact Probe was a small Indian lunar probe designed to detach from the Chandrayaan-1 spacecraft and intentionally crash onto the Moon’s surface to conduct scientific measurements and demonstrate landing technologies.
- 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: Apollo 15 subsatellite Target entity description: The Apollo 15 subsatellite (PFS-1) was a small scientific satellite released into lunar orbit by the Apollo 15 mission to study the Moon’s gravitational and magnetic fields.
-
A.
Luna spacecraft
The Luna spacecraft were a series of Soviet robotic probes launched between the late 1950s and 1970s that achieved many lunar exploration firsts, including the first human-made object to reach the Moon and the first soft landing on its surface.
-
B.
SLIM lunar lander
The SLIM lunar lander is a Japanese spacecraft designed by JAXA to demonstrate high-precision, lightweight landing technology on the Moon’s surface.
-
C.
Altair lunar lander
The Altair lunar lander was NASA’s planned next-generation crewed spacecraft for landing astronauts on the Moon as part of the post-Apollo Constellation program.
-
D.
Luna 11
Luna 11 was a Soviet unmanned spacecraft from the Luna program, launched in 1966 to study the Moon from lunar orbit.
-
E.
Moon Impact Probe
The Moon Impact Probe was a small Indian lunar probe designed to detach from the Chandrayaan-1 spacecraft and intentionally crash onto the Moon’s surface to conduct scientific measurements and demonstrate landing technologies.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
Apollo program hardware
ⓘ
PFS-1 ⓘ artificial satellite ⓘ lunar orbiter ⓘ scientific satellite ⓘ |
| alsoKnownAs |
PFS-1
NERFINISHED
ⓘ
Particles and Fields Subsatellite 1 NERFINISHED ⓘ |
| carriedInstrument |
S-band transponder
ⓘ
charged particle detector ⓘ magnetometer ⓘ plasma probe ⓘ |
| communicationBand | S-band ⓘ |
| countryOfOrigin |
United States of America
ⓘ
surface form:
United States
|
| dataUse |
characterizing lunar magnetic field structure
ⓘ
mapping lunar gravity field via tracking ⓘ |
| decay | reentered lunar surface ⓘ |
| deploymentMethod | spring-ejected from Service Module bay ⓘ |
| followedBy | Apollo 16 subsatellite NERFINISHED ⓘ |
| impactBody | Moon NERFINISHED ⓘ |
| impactDate | 1972-01-15 ⓘ |
| initialAposelene | ~141 km ⓘ |
| initialPeriselene | ~89 km ⓘ |
| launchDate | 1971-07-26 ⓘ |
| launchSite | Kennedy Space Center Launch Complex 39A ⓘ |
| launchVehicle | Saturn V NERFINISHED ⓘ |
| manufacturer | NASA Marshall Space Flight Center NERFINISHED ⓘ |
| mass | ~36 kg ⓘ |
| mission | Apollo 15 NERFINISHED ⓘ |
| missionDurationAfterRelease | several months ⓘ |
| missionOutcome | partially successful ⓘ |
| operator | NASA ⓘ |
| orbit | lunar orbit ⓘ |
| orbitInclination | ~28 degrees ⓘ |
| orbitPeriod | ~2 hours ⓘ |
| powerSource |
battery
ⓘ
solar cells ⓘ |
| precededBy | Explorer 35 NERFINISHED ⓘ |
| primaryMission |
measure charged particles near the Moon
ⓘ
study lunar gravitational field ⓘ study lunar magnetic field ⓘ |
| program | Apollo program NERFINISHED ⓘ |
| releaseDateInLunarOrbit | 1971-08-04 ⓘ |
| releasedBy | Apollo 15 Command and Service Module NERFINISHED ⓘ |
| shape | octagonal prism ⓘ |
| studied |
lunar environment particles and fields
ⓘ
lunar gravity anomalies ⓘ lunar magnetic anomalies ⓘ |
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: Apollo 15 subsatellite Description of subject: The Apollo 15 subsatellite (PFS-1) was a small scientific satellite released into lunar orbit by the Apollo 15 mission to study the Moon’s gravitational and magnetic fields.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
PFS-1