Eratosthenes (lunar crater)
E518070
Eratosthenes is a prominent lunar impact crater located near the eastern edge of Mare Imbrium, notable for its well-defined terraced walls and central peak.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Eratosthenes (lunar crater) canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5412516 — 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: Eratosthenes (lunar crater) Context triple: [Copernicus (lunar crater), nearbyCrater, Eratosthenes (lunar crater)]
-
A.
Levi-Civita crater
Levi-Civita crater is a large, heavily eroded impact crater on the Moon’s far side, named after Italian mathematician Tullio Levi-Civita.
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B.
Ernst Mach crater
Ernst Mach crater is a large impact crater on the Moon’s far side named in honor of the Austrian physicist and philosopher Ernst Mach.
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C.
Kepler (lunar crater)
Kepler (lunar crater) is a prominent, relatively young impact crater on the Moon’s near side, noted for its bright ray system and association with the astronomer Johannes Kepler.
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D.
Baade lunar crater
Baade lunar crater is a large impact feature on the Moon’s far side named in honor of German astronomer Walter Baade.
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E.
Chaplygin crater
Chaplygin crater is an impact crater on the Moon’s far side, notable for its heavily eroded rim and location near the large walled plain Gagarin.
- 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: Eratosthenes (lunar crater) Target entity description: Eratosthenes is a prominent lunar impact crater located near the eastern edge of Mare Imbrium, notable for its well-defined terraced walls and central peak.
-
A.
Levi-Civita crater
Levi-Civita crater is a large, heavily eroded impact crater on the Moon’s far side, named after Italian mathematician Tullio Levi-Civita.
-
B.
Ernst Mach crater
Ernst Mach crater is a large impact crater on the Moon’s far side named in honor of the Austrian physicist and philosopher Ernst Mach.
-
C.
Kepler (lunar crater)
Kepler (lunar crater) is a prominent, relatively young impact crater on the Moon’s near side, noted for its bright ray system and association with the astronomer Johannes Kepler.
-
D.
Baade lunar crater
Baade lunar crater is a large impact feature on the Moon’s far side named in honor of German astronomer Walter Baade.
-
E.
Chaplygin crater
Chaplygin crater is an impact crater on the Moon’s far side, notable for its heavily eroded rim and location near the large walled plain Gagarin.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf | lunar impact crater ⓘ |
| ageSystem | Eratosthenian system NERFINISHED ⓘ |
| cataloguedIn | IAU Gazetteer of Planetary Nomenclature NERFINISHED ⓘ |
| colongitude | 348 degrees ⓘ |
| depth | approximately 3.6 kilometers ⓘ |
| diameter | approximately 58 kilometers ⓘ |
| eponymOccupation |
Greek mathematician
ⓘ
astronomer ⓘ geographer ⓘ |
| floorCondition | relatively flat ⓘ |
| floorFeature | central peak rising from floor ⓘ |
| geologicAge | Eratosthenian NERFINISHED ⓘ |
| givesNameTo | Eratosthenian period NERFINISHED ⓘ |
| hasFeature |
central peak complex
ⓘ
ejecta blanket ⓘ ray system (faint and degraded) ⓘ sharp rim ⓘ well-defined terraced inner walls ⓘ |
| hasMorphologicalType | complex crater ⓘ |
| hasSatelliteCrater |
Eratosthenes A
NERFINISHED
ⓘ
Eratosthenes B NERFINISHED ⓘ Eratosthenes C NERFINISHED ⓘ Eratosthenes D NERFINISHED ⓘ Eratosthenes E NERFINISHED ⓘ Eratosthenes F NERFINISHED ⓘ Eratosthenes G NERFINISHED ⓘ Eratosthenes H NERFINISHED ⓘ Eratosthenes K NERFINISHED ⓘ Eratosthenes L NERFINISHED ⓘ Eratosthenes M NERFINISHED ⓘ Eratosthenes N NERFINISHED ⓘ Eratosthenes P NERFINISHED ⓘ Eratosthenes R NERFINISHED ⓘ |
| liesAt | transition between lunar maria and highlands ⓘ |
| locatedIn | near eastern edge of Mare Imbrium ⓘ |
| locatedNear |
Mare Imbrium
NERFINISHED
ⓘ
Montes Apenninus NERFINISHED ⓘ |
| locatedOn | Moon NERFINISHED ⓘ |
| namedAfter | Eratosthenes of Cyrene NERFINISHED ⓘ |
| namedBy | International Astronomical Union NERFINISHED ⓘ |
| observedFrom | Earth NERFINISHED ⓘ |
| quadrant | Moon’s near side ⓘ |
| rayPreservationState | rays mostly faded ⓘ |
| rimCondition | sharp and well-preserved ⓘ |
| sitedAt | southeastern edge of Mare Imbrium ⓘ |
| usedAsStratigraphicMarkerFor | start of Eratosthenian period ⓘ |
| visibleIn | small amateur telescopes ⓘ |
| wallStructure | terraced ⓘ |
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: Eratosthenes (lunar crater) Description of subject: Eratosthenes is a prominent lunar impact crater located near the eastern edge of Mare Imbrium, notable for its well-defined terraced walls and central peak.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Copernicus (lunar crater)