Ophir Chasma
E485881
Ophir Chasma is a large, steep-walled canyon on Mars forming part of the northern section of the vast Valles Marineris canyon system.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Ophir Chasma canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T4885576 — 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: Ophir Chasma Context triple: [Valles Marineris, hasSubfeature, Ophir Chasma]
-
A.
Candor Chasma
Candor Chasma is a major canyon within Mars’s vast Valles Marineris system, characterized by its deep troughs and layered deposits that offer insights into the planet’s geological history.
-
B.
Tithonium Chasma
Tithonium Chasma is a large, steep-walled canyon forming the northwestern segment of Mars’s vast Valles Marineris system.
-
C.
Ius Chasma
Ius Chasma is a large, steep-walled canyon on Mars that forms part of the vast Valles Marineris rift system.
-
D.
Ithaca Chasma
Ithaca Chasma is a vast, linear canyon system that nearly encircles Saturn’s moon Tethys and is one of the largest known chasms in the solar system.
-
E.
Melas Chasma
Melas Chasma is a large, deep canyon within Mars’s Valles Marineris system, notable for its extensive layered deposits and evidence of past water-related activity.
- 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: Ophir Chasma Target entity description: Ophir Chasma is a large, steep-walled canyon on Mars forming part of the northern section of the vast Valles Marineris canyon system.
-
A.
Candor Chasma
Candor Chasma is a major canyon within Mars’s vast Valles Marineris system, characterized by its deep troughs and layered deposits that offer insights into the planet’s geological history.
-
B.
Tithonium Chasma
Tithonium Chasma is a large, steep-walled canyon forming the northwestern segment of Mars’s vast Valles Marineris system.
-
C.
Ius Chasma
Ius Chasma is a large, steep-walled canyon on Mars that forms part of the vast Valles Marineris rift system.
-
D.
Ithaca Chasma
Ithaca Chasma is a vast, linear canyon system that nearly encircles Saturn’s moon Tethys and is one of the largest known chasms in the solar system.
-
E.
Melas Chasma
Melas Chasma is a large, deep canyon within Mars’s Valles Marineris system, notable for its extensive layered deposits and evidence of past water-related activity.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
canyon
ⓘ
chasma ⓘ surface feature on Mars ⓘ |
| connectedTo |
Candor Chasma
ⓘ
Melas Chasma ⓘ Tithonium Chasma ⓘ |
| containsGeologicalUnit |
dune fields
ⓘ
landslide aprons ⓘ layered deposits ⓘ massive bedrock ⓘ |
| featureTypeInGazetteer | chasma ⓘ |
| formedByProcess |
crustal rifting
ⓘ
tectonic extension ⓘ |
| hasAtmosphereAbove | thin carbon-dioxide-dominated Martian atmosphere ⓘ |
| hasCoordinateSystem | planetocentric latitude/longitude ⓘ |
| hasEnvironment | cold desert ⓘ |
| hasFloorCharacteristic |
chaotic terrain in parts
ⓘ
relatively flat floor in places ⓘ tectonically disrupted floor ⓘ |
| hasMorphology | canyon-like trough ⓘ |
| hasScientificDiscipline |
geomorphology
ⓘ
planetary geology ⓘ |
| hasSideCharacteristic |
landslide deposits
ⓘ
terraced walls ⓘ |
| hasWallCharacteristic | steep-walled ⓘ |
| imagedByInstrument |
CTX
ⓘ
HiRISE ⓘ
linked to:
HiRISE instrument
THEMIS ⓘ
linked to:
THEMIS instrument
|
| isComponentOf | equatorial canyon belt of Mars ⓘ |
| locatedInHemisphere |
Martian southern hemisphere
ⓘ
Martian western hemisphere ⓘ |
| locatedInRegion | northern Valles Marineris ⓘ |
| locatedOnPlanet | Mars ⓘ |
| modifiedByProcess |
aeolian erosion
ⓘ
landsliding ⓘ mass wasting ⓘ |
| namedAfter | Ophir (biblical region) ⓘ |
| namingAuthority | International Astronomical Union ⓘ |
| observedByMission |
Mariner 9
ⓘ
Mars Global Surveyor ⓘ Mars Odyssey ⓘ
linked to:
Mars Odyssey mission
Mars Reconnaissance Orbiter ⓘ Viking Orbiter ⓘ |
| partOf | Valles Marineris ⓘ |
| partOfSystem |
Valles Marineris canyon system
ⓘ
linked to:
Valles Marineris
|
| scientificInterest |
potential evidence for past water-related processes
ⓘ
records tectonic and erosional history of Valles Marineris ⓘ |
| surfaceType | rocky ⓘ |
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: Ophir Chasma Description of subject: Ophir Chasma is a large, steep-walled canyon on Mars forming part of the northern section of the vast Valles Marineris canyon system.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.