GRACE mission
E86308
The GRACE mission is a joint NASA–German Aerospace Center satellite project that precisely measures Earth's gravity field over time to study changes in ice sheets, sea level, groundwater, and other aspects of the global water cycle.
All labels observed (5)
| Label | Occurrences |
|---|---|
| GRACE | 1 |
| GRACE Follow-On | 1 |
| GRACE mission canonical | 1 |
| GRACE-FO | 1 |
| Gravity Recovery and Climate Experiment | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T727581 — 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: GRACE mission Context triple: [Jet Propulsion Laboratory, notableProject, GRACE mission]
-
A.
Deep Space Climate Observatory
The Deep Space Climate Observatory (DSCOVR) is a NOAA and NASA satellite positioned at the Sun–Earth L1 Lagrange point that continuously monitors solar wind conditions and provides real-time space weather and Earth observation data.
-
B.
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.
-
C.
Earth gravity model
The Earth gravity model is a mathematical representation of Earth's gravitational field used for precise positioning, navigation, and geodetic calculations.
-
D.
SCISAT-1
SCISAT-1 is a Canadian scientific satellite dedicated primarily to studying Earth's upper atmosphere and monitoring ozone layer chemistry and related trace gases.
-
E.
MICROSCOPE satellite mission
The MICROSCOPE satellite mission was a French-led space experiment designed to test the validity of Einstein’s equivalence principle with unprecedented precision by comparing the free fall of different materials in orbit.
- 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: GRACE mission Target entity description: The GRACE mission is a joint NASA–German Aerospace Center satellite project that precisely measures Earth's gravity field over time to study changes in ice sheets, sea level, groundwater, and other aspects of the global water cycle.
-
A.
Deep Space Climate Observatory
The Deep Space Climate Observatory (DSCOVR) is a NOAA and NASA satellite positioned at the Sun–Earth L1 Lagrange point that continuously monitors solar wind conditions and provides real-time space weather and Earth observation data.
-
B.
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.
-
C.
Earth gravity model
The Earth gravity model is a mathematical representation of Earth's gravitational field used for precise positioning, navigation, and geodetic calculations.
-
D.
SCISAT-1
SCISAT-1 is a Canadian scientific satellite dedicated primarily to studying Earth's upper atmosphere and monitoring ozone layer chemistry and related trace gases.
-
E.
MICROSCOPE satellite mission
The MICROSCOPE satellite mission was a French-led space experiment designed to test the validity of Einstein’s equivalence principle with unprecedented precision by comparing the free fall of different materials in orbit.
- F. None of above. chosen
Statements (55)
| Predicate | Object |
|---|---|
| instanceOf |
Earth observation mission
ⓘ
gravity field mission ⓘ satellite mission ⓘ |
| acronym |
GRACE mission
self-linksurface differs
ⓘ
surface form:
GRACE
|
| altitude | about 500 km at launch ⓘ |
| application |
drought monitoring
ⓘ
glacial isostatic adjustment studies ⓘ ice sheet mass loss estimation in Antarctica ⓘ ice sheet mass loss estimation in Greenland ⓘ sea level budget studies ⓘ solid Earth response to earthquakes ⓘ terrestrial water storage monitoring ⓘ |
| country |
Germany
ⓘ
United States of America ⓘ
surface form:
United States
|
| dataAvailability | publicly available ⓘ |
| dataProduct |
monthly gravity field solutions
ⓘ
time-variable gravity maps ⓘ |
| fullName |
GRACE mission
self-linksurface differs
ⓘ
surface form:
Gravity Recovery and Climate Experiment
|
| fundingAgency |
German Aerospace Center (DLR)
ⓘ
Jet Propulsion Laboratory ⓘ
surface form:
NASA Jet Propulsion Laboratory
|
| inclination | about 89 degrees ⓘ |
| launchDate | 2002-03-17 ⓘ |
| launchSite |
Plesetsk Cosmodrome
ⓘ
Plesetsk Cosmodrome ⓘ
surface form:
Plesetsk Cosmodrome Site 133
|
| launchVehicle |
Rokot
ⓘ
surface form:
Rockot
|
| measurementTechnique |
accelerometer measurements
ⓘ
microwave ranging between twin satellites ⓘ precise GPS tracking ⓘ satellite-to-satellite tracking in low Earth orbit ⓘ |
| missionDuration | about 15 years ⓘ |
| missionEnd | 2017 ⓘ |
| missionStart | 2002 ⓘ |
| notableContribution | first satellite mission to provide monthly global maps of Earth’s gravity field variations ⓘ |
| notableImpact |
enabled global groundwater depletion assessments
ⓘ
transformed understanding of large-scale ice mass loss ⓘ |
| numberOfSatellites | 2 ⓘ |
| operator |
German Aerospace Center (DLR)
ⓘ
surface form:
German Aerospace Center
NASA ⓘ |
| orbitRegime | low Earth orbit ⓘ |
| orbitType | near-polar orbit ⓘ |
| partnerInstitution |
German Research Centre for Geosciences
ⓘ
surface form:
GeoForschungsZentrum Potsdam
University of Texas at Austin Center for Space Research ⓘ |
| primaryObjective |
measure Earth’s gravity field variations over time
ⓘ
study changes in Earth’s water storage ⓘ |
| scienceTeamLeadAgency |
Jet Propulsion Laboratory
ⓘ
surface form:
NASA Jet Propulsion Laboratory
|
| scientificGoal |
improve models of Earth’s interior mass distribution
ⓘ
monitor groundwater storage changes ⓘ monitor ice sheet mass balance ⓘ monitor sea level change contributions from land ice ⓘ study ocean bottom pressure variations ⓘ study the global water cycle ⓘ |
| spacecraftType | twin-satellite formation ⓘ |
| status | completed ⓘ |
| successorMission |
GRACE mission
self-linksurface differs
ⓘ
surface form:
GRACE-FO
|
| successorMissionFullName |
GRACE mission
self-linksurface differs
ⓘ
surface form:
GRACE Follow-On
|
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: GRACE mission Description of subject: The GRACE mission is a joint NASA–German Aerospace Center satellite project that precisely measures Earth's gravity field over time to study changes in ice sheets, sea level, groundwater, and other aspects of the global water cycle.
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Gravity Recovery and Climate Experiment
this entity surface form:
GRACE
this entity surface form:
GRACE-FO
this entity surface form:
GRACE Follow-On