GRAIL
E648458
GRAIL was a NASA lunar mission that used twin spacecraft to map the Moon’s gravitational field in unprecedented detail to study its internal structure and evolution.
All labels observed (2)
| Label | Occurrences |
|---|---|
| GRAIL canonical | 1 |
| GRAIL mission | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7210433 — 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: GRAIL Context triple: [NASA Discovery Program, mission, GRAIL]
-
A.
Lunar Reconnaissance Orbiter
Lunar Reconnaissance Orbiter is a NASA robotic spacecraft launched in 2009 to map the Moon’s surface in high detail and search for resources such as water ice.
-
B.
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.
-
C.
Moon Ra
Moon Ra is a fictional character or element from Jon Anderson’s progressive rock concept album "Olias of Sunhillow," contributing to its mythic, science-fantasy narrative world.
-
D.
Dawn mission
The Dawn mission was a NASA space probe that studied the two largest bodies in the asteroid belt, Vesta and Ceres, to investigate the conditions and processes of the early solar system.
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E.
Selenological and Engineering Explorer
Selenological and Engineering Explorer, also known as Kaguya (SELENE), was a Japanese lunar orbiter mission launched by JAXA to study the Moon’s origin, evolution, and surface in unprecedented detail.
- 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: GRAIL Target entity description: GRAIL was a NASA lunar mission that used twin spacecraft to map the Moon’s gravitational field in unprecedented detail to study its internal structure and evolution.
-
A.
Lunar Reconnaissance Orbiter
Lunar Reconnaissance Orbiter is a NASA robotic spacecraft launched in 2009 to map the Moon’s surface in high detail and search for resources such as water ice.
-
B.
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.
-
C.
Moon Ra
Moon Ra is a fictional character or element from Jon Anderson’s progressive rock concept album "Olias of Sunhillow," contributing to its mythic, science-fantasy narrative world.
-
D.
Dawn mission
The Dawn mission was a NASA space probe that studied the two largest bodies in the asteroid belt, Vesta and Ceres, to investigate the conditions and processes of the early solar system.
-
E.
Selenological and Engineering Explorer
Selenological and Engineering Explorer, also known as Kaguya (SELENE), was a Japanese lunar orbiter mission launched by JAXA to study the Moon’s origin, evolution, and surface in unprecedented detail.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
NASA lunar mission
ⓘ
lunar gravity mission ⓘ |
| arrivalAtMoon | 2011-12 ⓘ |
| communicationBand | X-band ⓘ |
| countryOfOrigin |
United States of America
ⓘ
surface form:
United States
|
| dataType | high-resolution gravity field measurements ⓘ |
| endOfMissionEvent | controlled impact on the Moon ⓘ |
| fullName | Gravity Recovery and Interior Laboratory NERFINISHED ⓘ |
| fundingAgency | NASA Science Mission Directorate NERFINISHED ⓘ |
| heritageFrom | Gravity Recovery and Climate Experiment (GRACE) NERFINISHED ⓘ |
| impactFeatureName | Sally Ride Crater NERFINISHED ⓘ |
| impactLocation | near the lunar north pole ⓘ |
| institutionOfPI | Massachusetts Institute of Technology NERFINISHED ⓘ |
| launchDate | 2011-09-10 ⓘ |
| launchMass | approximately 307 kilograms per spacecraft ⓘ |
| launchSite | Cape Canaveral Air Force Station Space Launch Complex 17B NERFINISHED ⓘ |
| launchVehicle | Delta II 7920H-10C NERFINISHED ⓘ |
| managedBy | NASA Marshall Space Flight Center NERFINISHED ⓘ |
| measurementTechnique | microwave ranging between twin spacecraft ⓘ |
| missionClass | Discovery-class mission ⓘ |
| missionEnd | 2012-12-17 ⓘ |
| missionType | lunar gravity mapping mission ⓘ |
| namedFeatureHonors | Sally Ride NERFINISHED ⓘ |
| nickname |
Ebb
NERFINISHED
ⓘ
Flow NERFINISHED ⓘ |
| objective |
improve understanding of lunar crust and mantle structure
ⓘ
investigate the Moon’s thermal evolution ⓘ study the Moon’s internal structure ⓘ |
| operatedBy | NASA Jet Propulsion Laboratory NERFINISHED ⓘ |
| operator | NASA ⓘ |
| orbitAltitude | low lunar orbit ⓘ |
| orbitType | near-circular polar lunar orbit ⓘ |
| primaryObjective | map the Moon’s gravitational field in high detail ⓘ |
| principalInvestigator | Maria T. Zuber NERFINISHED ⓘ |
| program | NASA Discovery Program NERFINISHED ⓘ |
| relatedMission | GRACE NERFINISHED ⓘ |
| result |
constrained models of lunar interior structure
ⓘ
improved understanding of lunar impact basins ⓘ produced the most detailed global lunar gravity map to date ⓘ provided insights into the Moon’s thermal and magmatic history ⓘ revealed crustal thickness variations of the Moon ⓘ |
| scienceInstrument | Lunar Gravity Ranging System NERFINISHED ⓘ |
| sciencePhaseStart | 2012-03 ⓘ |
| spacecraft |
GRAIL-A
NERFINISHED
ⓘ
GRAIL-B NERFINISHED ⓘ |
| spacecraftBus | Lockheed Martin-built spacecraft bus ⓘ |
| status | completed ⓘ |
| target | Moon NERFINISHED ⓘ |
| uses | twin spacecraft ⓘ |
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: GRAIL Description of subject: GRAIL was a NASA lunar mission that used twin spacecraft to map the Moon’s gravitational field in unprecedented detail to study its internal structure and evolution.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Mare Cognitum
this entity surface form:
GRAIL mission