Theta1 Orionis C
E514710
Theta1 Orionis C is the most massive and luminous star in the Trapezium cluster at the heart of the Orion Nebula, dominating its energetic radiation and stellar environment.
All labels observed (4)
| Label | Occurrences |
|---|---|
| Theta1 Orionis C canonical | 9 |
| Theta-1 Orionis C | 1 |
| Theta1 Orionis multiple star system | 1 |
| θ1 Ori C | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5362868 — 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: Theta1 Orionis C Context triple: [Orion Nebula, primaryIonizingStar, Theta1 Orionis C]
-
A.
Orion Bar
Orion Bar is a bright, elongated photodissociation region at the edge of the Orion Nebula, where intense ultraviolet radiation from young massive stars shapes and illuminates dense molecular gas and dust.
-
B.
R136a1
R136a1 is an extremely massive and luminous Wolf–Rayet star in the Large Magellanic Cloud, considered one of the most massive stars known.
-
C.
Eta Carinae
Eta Carinae is a highly luminous and unstable massive stellar system in the constellation Carina, famous for its 19th-century "Great Eruption" and its surrounding Homunculus Nebula.
-
D.
Zeta Tucanae
Zeta Tucanae is a main-sequence F-type star located in the southern constellation Tucana, visible to the naked eye from dark-sky locations.
-
E.
Barnard 5
Barnard 5 is a dark molecular cloud and active star-forming region located within the Perseus molecular cloud complex.
- 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: Theta1 Orionis C Target entity description: Theta1 Orionis C is the most massive and luminous star in the Trapezium cluster at the heart of the Orion Nebula, dominating its energetic radiation and stellar environment.
-
A.
Orion Bar
Orion Bar is a bright, elongated photodissociation region at the edge of the Orion Nebula, where intense ultraviolet radiation from young massive stars shapes and illuminates dense molecular gas and dust.
-
B.
R136a1
R136a1 is an extremely massive and luminous Wolf–Rayet star in the Large Magellanic Cloud, considered one of the most massive stars known.
-
C.
Eta Carinae
Eta Carinae is a highly luminous and unstable massive stellar system in the constellation Carina, famous for its 19th-century "Great Eruption" and its surrounding Homunculus Nebula.
-
D.
Zeta Tucanae
Zeta Tucanae is a main-sequence F-type star located in the southern constellation Tucana, visible to the naked eye from dark-sky locations.
-
E.
Barnard 5
Barnard 5 is a dark molecular cloud and active star-forming region located within the Perseus molecular cloud complex.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
O-type main-sequence star
ⓘ
massive star ⓘ primary ionizing source ⓘ star ⓘ |
| affects |
dynamics of nearby young stars in Trapezium
ⓘ
structure of Orion Nebula H II region ⓘ |
| componentOf |
Orion OB1 association
ⓘ
linked to:
Orion OB association
|
| dominatesRadiationFieldOf | Orion Nebula ⓘ |
| dominatesStellarEnvironmentOf |
Trapezium cluster
ⓘ
linked to:
Trapezium Cluster
|
| drives | photoevaporation of protoplanetary disks in Orion Nebula ⓘ |
| hasAge | about 1 million years ⓘ |
| hasAlternativeName |
HD 37022
ⓘ
HIP 26241 ⓘ HR 1892 ⓘ Theta-1 Orionis C ⓘ
linked to:
Theta1 Orionis C
V1016 Orionis ⓘ θ1 Ori C ⓘ
linked to:
Theta1 Orionis C
|
| hasApparentMagnitudeV | about 5.1 ⓘ |
| hasApproximateDistanceFromEarth |
about 1,300 light-years
ⓘ
about 400 parsecs ⓘ |
| hasApproximateEffectiveTemperature | about 40,000 K ⓘ |
| hasApproximateLuminosity | several hundred thousand times solar luminosity ⓘ |
| hasApproximateMass |
30 solar masses
ⓘ
40 solar masses ⓘ |
| hasCompanionType | massive early-type star ⓘ |
| hasDeclination | −05° 23′ ⓘ |
| hasLuminosityClass | V ⓘ |
| hasMagneticField | strong, organized ⓘ |
| hasRightAscension | 05h 35m ⓘ |
| hasSpectralType |
O6
ⓘ
O7 ⓘ |
| hasStellarWind | strong ⓘ |
| hasVariableType | spectroscopic variable ⓘ |
| influences | evolution of proplyds in Orion Nebula ⓘ |
| ionizes | gas in the Orion Nebula ⓘ |
| isBinarySystem | true ⓘ |
| isMostLuminousStarOf |
Trapezium cluster
ⓘ
linked to:
Trapezium Cluster
|
| isMostMassiveStarOf |
Trapezium cluster
ⓘ
linked to:
Trapezium Cluster
|
| isPrimarySourceOf | ultraviolet radiation in the Orion Nebula core ⓘ |
| isYoungStar | true ⓘ |
| locatedIn |
Orion Molecular Cloud Complex
ⓘ
Orion Nebula ⓘ constellation Orion ⓘ |
| memberOf |
Trapezium cluster
ⓘ
linked to:
Trapezium Cluster
|
| observedIn |
X-ray wavelengths
ⓘ
optical wavelengths ⓘ ultraviolet wavelengths ⓘ |
| partOf |
Theta1 Orionis multiple star system
ⓘ
linked to:
Theta1 Orionis C
|
| shows | X-ray emission ⓘ |
| willEndAs | core-collapse supernova ⓘ |
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: Theta1 Orionis C Description of subject: Theta1 Orionis C is the most massive and luminous star in the Trapezium cluster at the heart of the Orion Nebula, dominating its energetic radiation and stellar environment.
Referenced by (12)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Theta1 Orionis C
linked to: Theta1 Orionis C
linked to: Theta1 Orionis C