Merlin 1C sea-level
E707032
Merlin 1C sea-level is an earlier sea-level variant of SpaceX’s Merlin rocket engine, used on initial Falcon 9 launches before being succeeded by the Merlin 1D.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Merlin 1C sea-level canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T8055414 — 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: Merlin 1C sea-level Context triple: [Merlin 1D sea-level, predecessor, Merlin 1C sea-level]
-
A.
Merlin 1D sea-level
Merlin 1D sea-level is the atmospheric-optimized version of SpaceX’s Merlin 1D rocket engine, used on the Falcon 9 first stage to provide high thrust and efficiency during liftoff and ascent.
-
B.
NEPTUNE observatory
NEPTUNE observatory is a large cabled ocean observatory off Canada’s Pacific coast that provides continuous, real-time monitoring of seafloor and ocean processes for scientific research.
-
C.
Aqua satellite
Aqua is a NASA Earth observation satellite focused on studying the planet’s water cycle, including oceans, atmosphere, and ice.
-
D.
NASA Sentinel-6 Michael Freilich
NASA Sentinel-6 Michael Freilich is an oceanography satellite mission dedicated to precisely measuring global sea level and monitoring changes in Earth’s oceans and climate.
-
E.
Halley II
Halley II was an early British Antarctic research station on the Brunt Ice Shelf, used primarily for geophysical and atmospheric science studies.
- 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: Merlin 1C sea-level Target entity description: Merlin 1C sea-level is an earlier sea-level variant of SpaceX’s Merlin rocket engine, used on initial Falcon 9 launches before being succeeded by the Merlin 1D.
-
A.
Merlin 1D sea-level
Merlin 1D sea-level is the atmospheric-optimized version of SpaceX’s Merlin 1D rocket engine, used on the Falcon 9 first stage to provide high thrust and efficiency during liftoff and ascent.
-
B.
NEPTUNE observatory
NEPTUNE observatory is a large cabled ocean observatory off Canada’s Pacific coast that provides continuous, real-time monitoring of seafloor and ocean processes for scientific research.
-
C.
Aqua satellite
Aqua is a NASA Earth observation satellite focused on studying the planet’s water cycle, including oceans, atmosphere, and ice.
-
D.
NASA Sentinel-6 Michael Freilich
NASA Sentinel-6 Michael Freilich is an oceanography satellite mission dedicated to precisely measuring global sea level and monitoring changes in Earth’s oceans and climate.
-
E.
Halley II
Halley II was an early British Antarctic research station on the Brunt Ice Shelf, used primarily for geophysical and atmospheric science studies.
- F. None of above. chosen
Statements (42)
| Predicate | Object |
|---|---|
| instanceOf |
Merlin engine variant
ⓘ
liquid-fuel rocket engine ⓘ rocket engine ⓘ |
| chamberPressure_bar | about 67 ⓘ |
| configurationOnFalcon9 | nine engines on first stage ⓘ |
| countryOfOrigin |
United States
ⓘ
linked to:
United States of America
|
| cycle | gas-generator cycle ⓘ |
| designedFor | orbital launch vehicles ⓘ |
| developer | SpaceX ⓘ |
| family | Merlin 1C ⓘ |
| firstUseYear | 2007 ⓘ |
| fuel | RP-1 kerosene ⓘ |
| generation | early Merlin engine generation ⓘ |
| gimbalRange_deg | about 5 ⓘ |
| intendedUse | booster engine ⓘ |
| manufacturer | SpaceX ⓘ |
| nozzleType | regeneratively cooled nozzle ⓘ |
| oxidizer | liquid oxygen ⓘ |
| predecessor | Merlin 1A ⓘ |
| propellantFeed | turbopump-fed ⓘ |
| propellantType | LOX/RP-1 ⓘ |
| replacedOnFalcon9By | Merlin 1D sea-level ⓘ |
| reusability | expendable ⓘ |
| role | first-stage engine ⓘ |
| specificImpulseSeaLevel_s | about 275 ⓘ |
| specificImpulseVacuum_s | about 304 ⓘ |
| status | retired ⓘ |
| successor | Merlin 1D sea-level ⓘ |
| thrustAtSeaLevel_kN | about 420 ⓘ |
| thrustInVacuum_kN | about 480 ⓘ |
| thrustVectorControl | gimbaled engine ⓘ |
| usedBy | SpaceX ⓘ |
| usedOn |
Falcon 1
ⓘ
linked to:
Falcon 1 rocket
Falcon 9 ⓘ
linked to:
Falcon 9 rocket
|
| usedOnMission |
Falcon 1 Flight 4
ⓘ
linked to:
Falcon 1 rocket
Falcon 1 Flight 5 ⓘ
linked to:
Falcon 1 rocket
Falcon 9 Flight 1 ⓘ Falcon 9 Flight 2 ⓘ
linked to:
Falcon 9 Flight 1
|
| usedOnVehicleStage |
Falcon 1 first stage
ⓘ
linked to:
Falcon 1 rocket
|
| usedOnVehicleStage | Falcon 9 first stage ⓘ |
| usedUntil | early Falcon 9 v1.0 era ⓘ |
| variantOf | Merlin 1C ⓘ |
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: Merlin 1C sea-level Description of subject: Merlin 1C sea-level is an earlier sea-level variant of SpaceX’s Merlin rocket engine, used on initial Falcon 9 launches before being succeeded by the Merlin 1D.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.