Ithaca Chasma
E170948
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.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Ithaca Chasma canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1488046 — 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: Ithaca Chasma Context triple: [Tethys, hasFeature, Ithaca Chasma]
-
A.
Gale Crater
Gale Crater is a large impact crater on Mars that has been extensively explored for its layered geological history and past habitability clues.
-
B.
Occator Crater
Occator Crater is a prominent impact crater on the dwarf planet Ceres, best known for its bright salt deposits that suggest past subsurface brine activity.
-
C.
Valles Marineris
Valles Marineris is a vast canyon system on Mars, stretching thousands of kilometers and ranking among the largest known canyons in the Solar System.
-
D.
Jezero Crater
Jezero Crater is an ancient impact basin on Mars that once hosted a lake and river delta, making it a prime site for studying past habitability and searching for signs of ancient life.
-
E.
Lyell Canyon
Lyell Canyon is a scenic glacial valley in Yosemite National Park known for its meadows, the Lyell Fork of the Tuolumne River, and access to high Sierra backcountry.
- 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: Ithaca Chasma Target entity description: 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.
-
A.
Gale Crater
Gale Crater is a large impact crater on Mars that has been extensively explored for its layered geological history and past habitability clues.
-
B.
Occator Crater
Occator Crater is a prominent impact crater on the dwarf planet Ceres, best known for its bright salt deposits that suggest past subsurface brine activity.
-
C.
Valles Marineris
Valles Marineris is a vast canyon system on Mars, stretching thousands of kilometers and ranking among the largest known canyons in the Solar System.
-
D.
Jezero Crater
Jezero Crater is an ancient impact basin on Mars that once hosted a lake and river delta, making it a prime site for studying past habitability and searching for signs of ancient life.
-
E.
Lyell Canyon
Lyell Canyon is a scenic glacial valley in Yosemite National Park known for its meadows, the Lyell Fork of the Tuolumne River, and access to high Sierra backcountry.
- F. None of above. chosen
Statements (30)
| Predicate | Object |
|---|---|
| instanceOf |
canyon system
ⓘ
chasma ⓘ |
| celestialBody | Tethys ⓘ |
| coordinateSystem | Tethys coordinate system ⓘ |
| depthApproxKm | 3 ⓘ |
| discoveredBy |
Voyager 1
ⓘ
Voyager 2 ⓘ |
| extendsOver | most of Tethys circumference ⓘ |
| featureTypeDesignation | chasma ⓘ |
| formationHypothesis |
cooling and expansion of Tethys interior
ⓘ
global tectonic fracturing ⓘ impact-related fracturing ⓘ |
| governingBodyForName | International Astronomical Union ⓘ |
| imagedInDetailBy | Cassini–Huygens ⓘ |
| isOneOf | largest chasms in the Solar System ⓘ |
| lengthApproxKm | 2000 ⓘ |
| locatedIn |
Saturnian system
ⓘ
surface form:
Saturn system
outer Solar System ⓘ |
| locatedOn | Tethys ⓘ |
| namedAfter | Ithaca ⓘ |
| nameOrigin | island of Ithaca from Greek mythology ⓘ |
| nearlyEncircles | Tethys ⓘ |
| observedIn |
infrared wavelengths
ⓘ
visible light ⓘ |
| orbits | Saturn ⓘ |
| planetaryBodyType | satellite surface feature ⓘ |
| surfaceContext | heavily cratered terrain of Tethys ⓘ |
| surfaceFeatureOf | Tethys ⓘ |
| surfaceType | tectonic trough ⓘ |
| widthRangeKm | 20–100 ⓘ |
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: Ithaca Chasma Description of subject: 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.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.