Triple

T4885574
Position Surface form Disambiguated ID Type / Status
Subject Valles Marineris E109430 entity
Predicate hasSubfeature P25619 FINISHED
Object 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.
 E482625 NE FINISHED

How this triple was built (4 steps)

Every LLM step that produced this triple, in pipeline order — named-entity classification, the disambiguation choices (the exact options shown, with the pick highlighted), and the generated description. The batch + timestamp of each is in the Provenance table below.

NER Named-entity recognition gpt-5-mini
Instruction
Given a phrase, classify it is english named entity (e.g., persons, organizations, works of art) in Latin script, or not (e.g., literals, dates, URLs, verbose phrases). For disambiguation, the statement where the phrase occurs as object is also given. Please return a JSON object with `phrase` (string, the phrase being analyzed) and `is_ne` (boolean, indicating whether the phrase is a Named Entity).
Input
Phrase: Melas Chasma | Statement: [Valles Marineris, hasSubfeature, Melas Chasma]
NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07 
Target entity: Melas Chasma
Context triple: [Valles Marineris, hasSubfeature, Melas Chasma]
  • A. Tithonium Chasma
    Tithonium Chasma is a large, steep-walled canyon forming the northwestern segment of Mars’s vast Valles Marineris system.
  • B. Ius Chasma
    Ius Chasma is a large, steep-walled canyon on Mars that forms part of the vast Valles Marineris rift system.
  • 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. 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. Ares Vallis
    Ares Vallis is an ancient outflow channel on Mars, notable as a geologically diverse floodplain that was explored in situ by NASA’s Mars Pathfinder mission.
  • F. None of above. chosen
  • G. Unsure - the case is ambiguous/there is not enough information to decide.
NEDg Description generation gpt-5.1
Instruction
Generate a one-sentence description of the target entity. 
You are given a context triple in the form (subject, predicate, object), where the object is the target entity. 
# Instructions
Use the triple to infer relevant information about the entity. Describe the entity based on what is most defining, well-known. 
Avoid repeating the information from the triple, unless really essential.
# Response Format
Return only the sentence: "Description: [one-sentence description of the target entity]"
Input
Entity: Melas Chasma
Triple: [Valles Marineris, hasSubfeature, Melas Chasma]
Generated description
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.
NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07 
Target entity: Melas Chasma
Target entity description: 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.
  • A. Tithonium Chasma
    Tithonium Chasma is a large, steep-walled canyon forming the northwestern segment of Mars’s vast Valles Marineris system.
  • B. Ius Chasma
    Ius Chasma is a large, steep-walled canyon on Mars that forms part of the vast Valles Marineris rift system.
  • 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. 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. Ares Vallis
    Ares Vallis is an ancient outflow channel on Mars, notable as a geologically diverse floodplain that was explored in situ by NASA’s Mars Pathfinder mission.
  • F. None of above. chosen

Provenance (5 batches)

The batch behind each pipeline step, in order, with when it ran. Timestamps are batch-level — stages were processed in waves, so the object chain (NER → NED1 → NEDg → NED2) reads in order, but predicate / elicitation batches can sit in a different wave.

Step Stage Batch ID Status When
creating Elicitation batch_69bd440f71348190b99938e59fb7f9a1 completed March 20, 2026, 12:56 p.m.
NER Named-entity recognition batch_69bd6de3718881908521968fa6e6b444 completed March 20, 2026, 3:55 p.m.
NED1 Entity disambiguation (via context triple) batch_69be81b60ea48190ae8cd7ef9c30a388 completed March 21, 2026, 11:32 a.m.
NEDg Description generation batch_69be842c58a481909a0bd1d608a59d88 completed March 21, 2026, 11:42 a.m.
NED2 Entity disambiguation (via description) batch_69be848b0df88190aba28a258d8a706e completed March 21, 2026, 11:44 a.m.
Created at: March 20, 2026, 1:27 p.m.