Merlin 1D sea-level
E187985
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.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Merlin 1D sea-level canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1666927 — 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 1D sea-level Context triple: [Merlin 1D, variant, Merlin 1D sea-level]
-
A.
ICE Data Services
ICE Data Services is a financial market data and analytics provider offering real-time and historical pricing, reference data, and related services to global market participants.
-
B.
SEAS
SEAS is the acronym for Yale University's School of Engineering & Applied Science, which houses its engineering and applied science programs.
-
C.
Aqua satellite
Aqua is a NASA Earth observation satellite focused on studying the planet’s water cycle, including oceans, atmosphere, and ice.
-
D.
GRACE mission
The GRACE mission is a joint NASA–German Aerospace Center satellite project that precisely measures Earth's gravity field over time to study changes in ice sheets, sea level, groundwater, and other aspects of the global water cycle.
-
E.
Global Ocean Observing System
The Global Ocean Observing System is an international collaborative framework that coordinates and advances sustained ocean observations to support climate research, weather forecasting, marine services, and environmental management.
- 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 1D sea-level Target entity description: 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.
-
A.
ICE Data Services
ICE Data Services is a financial market data and analytics provider offering real-time and historical pricing, reference data, and related services to global market participants.
-
B.
SEAS
SEAS is the acronym for Yale University's School of Engineering & Applied Science, which houses its engineering and applied science programs.
-
C.
Aqua satellite
Aqua is a NASA Earth observation satellite focused on studying the planet’s water cycle, including oceans, atmosphere, and ice.
-
D.
GRACE mission
The GRACE mission is a joint NASA–German Aerospace Center satellite project that precisely measures Earth's gravity field over time to study changes in ice sheets, sea level, groundwater, and other aspects of the global water cycle.
-
E.
Global Ocean Observing System
The Global Ocean Observing System is an international collaborative framework that coordinates and advances sustained ocean observations to support climate research, weather forecasting, marine services, and environmental management.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
Merlin 1D engine variant
ⓘ
liquid-fueled rocket engine ⓘ |
| application | reusable launch vehicle first stages ⓘ |
| chamberPressure | approximately 9.7 MPa ⓘ |
| clusterNameOnFalcon9 | Octaweb engine arrangement ⓘ |
| combustionChamberCount | 1 ⓘ |
| configurationOnFalcon9 | nine engines per first stage ⓘ |
| coolingMethod | regenerative cooling ⓘ |
| countryOfOrigin |
United States of America
ⓘ
surface form:
United States
|
| designedBy | SpaceX propulsion engineering team ⓘ |
| developer | SpaceX ⓘ |
| engineCycle | gas-generator cycle ⓘ |
| family | Merlin engine family ⓘ |
| firstUseVehicle |
Falcon 9 rocket
ⓘ
surface form:
Falcon 9 v1.1
|
| fuel | RP-1 kerosene ⓘ |
| gimbalRange | approximately ±5 degrees ⓘ |
| hasVariant |
Merlin 1D
ⓘ
surface form:
Merlin 1D Vacuum
|
| ignitionSystem | TEA-TEB pyrophoric ignition ⓘ |
| manufacturer | SpaceX ⓘ |
| mixtureRatio | approximately 2.5:1 (oxidizer to fuel mass ratio) ⓘ |
| nozzleExpansionRatio | approximately 16 ⓘ |
| optimizedFor |
atmospheric flight
ⓘ
sea-level operation ⓘ |
| oxidizer | liquid oxygen ⓘ |
| predecessor | Merlin 1C sea-level ⓘ |
| propellantFeedSystem | turbopump-fed ⓘ |
| propellantType |
RP-1 kerosene
ⓘ
liquid oxygen (LOX) ⓘ |
| reusability | designed for multiple restarts and reuse ⓘ |
| role |
primary propulsion for Falcon 9 first stage
ⓘ
provides thrust for liftoff and initial ascent ⓘ |
| specificImpulseAtSeaLevel | approximately 282 s ⓘ |
| specificImpulseInVacuum | approximately 311 s ⓘ |
| status | operational ⓘ |
| throttleCapability | approximately 70% to 100% of rated thrust ⓘ |
| thrustAtSeaLevel |
approximately 190,000 lbf
ⓘ
approximately 845 kN ⓘ |
| usedFor |
cargo missions to the International Space Station
ⓘ
commercial satellite launches ⓘ crewed missions on Falcon 9 with Crew Dragon ⓘ orbital launch vehicles ⓘ |
| usedOn |
Falcon 9 first stage
ⓘ
surface form:
Falcon 9 Block 5 first stage
Falcon 9 first stage ⓘ
surface form:
Falcon 9 Full Thrust first stage
Falcon 9 first stage ⓘ Falcon 9 first stage ⓘ
surface form:
Falcon 9 v1.1 first stage
Falcon Heavy rocket ⓘ
surface form:
Falcon Heavy center core
Falcon Heavy rocket ⓘ
surface form:
Falcon Heavy side boosters
|
| variantOf | Merlin 1D ⓘ |
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 1D sea-level Description of subject: 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.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.