σ Orionis cluster
E460826
The σ Orionis cluster is a young, compact star cluster in the Orion constellation, notable for its massive central multiple star system and role in illuminating and shaping the surrounding Orion Molecular Cloud Complex.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Sigma Orionis | 1 |
| σ Orionis cluster canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4617569 — 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: σ Orionis cluster Context triple: [Orion Molecular Cloud Complex, contains, σ Orionis cluster]
-
A.
Jewel Box cluster
The Jewel Box cluster is a bright and colorful open star cluster in the constellation Crux, renowned for its striking mix of blue and red stars visible even in small telescopes.
-
B.
Beti-Fang cluster
The Beti-Fang cluster is a group of closely related Bantu languages spoken primarily in Cameroon, Equatorial Guinea, and neighboring Central African regions.
-
C.
Hyades
The Hyades are a sisterhood of nymphs in Greek mythology, best known for their association with rain and their representation as a prominent open star cluster in the constellation Taurus.
-
D.
Trapezium Cluster
The Trapezium Cluster is a compact group of young, massive stars in the heart of the Orion Nebula that illuminates and shapes the surrounding star-forming region.
-
E.
Orion OB association
The Orion OB association is a nearby stellar grouping dominated by young, massive O- and B-type stars in the Orion constellation, serving as a key region for studying recent star formation in our galactic neighborhood.
- 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: σ Orionis cluster Target entity description: The σ Orionis cluster is a young, compact star cluster in the Orion constellation, notable for its massive central multiple star system and role in illuminating and shaping the surrounding Orion Molecular Cloud Complex.
-
A.
Jewel Box cluster
The Jewel Box cluster is a bright and colorful open star cluster in the constellation Crux, renowned for its striking mix of blue and red stars visible even in small telescopes.
-
B.
Beti-Fang cluster
The Beti-Fang cluster is a group of closely related Bantu languages spoken primarily in Cameroon, Equatorial Guinea, and neighboring Central African regions.
-
C.
Hyades
The Hyades are a sisterhood of nymphs in Greek mythology, best known for their association with rain and their representation as a prominent open star cluster in the constellation Taurus.
-
D.
Trapezium Cluster
The Trapezium Cluster is a compact group of young, massive stars in the heart of the Orion Nebula that illuminates and shapes the surrounding star-forming region.
-
E.
Orion OB association
The Orion OB association is a nearby stellar grouping dominated by young, massive O- and B-type stars in the Orion constellation, serving as a key region for studying recent star formation in our galactic neighborhood.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
astronomical object
ⓘ
open star cluster ⓘ young stellar cluster ⓘ |
| age | approximately 2–5 million years ⓘ |
| angularSeparationFrom |
Alnilam
ⓘ
Alnitak ⓘ Mintaka ⓘ |
| associatedWith |
Horsehead Nebula region
ⓘ
linked to:
Horsehead Nebula
IC 434 emission nebula ⓘ |
| contains |
Herbig Ae/Be stars
ⓘ
T Tauri stars ⓘ brown dwarfs ⓘ low-mass pre-main-sequence stars ⓘ massive OB-type stars ⓘ planetary-mass objects ⓘ protoplanetary disks ⓘ |
| declination | approximately −02° 36′ ⓘ |
| distanceFromEarth |
approximately 1,200 light-years
ⓘ
approximately 380 parsecs ⓘ |
| embeddedIn |
Orion B molecular cloud
ⓘ
linked to:
Orion Molecular Cloud Complex
|
| hasCentralObject |
Sigma Orionis multiple star system
ⓘ
linked to:
Sigma Orionis
|
| hasCentralStarType |
B-type companions
ⓘ
O9.5V (Sigma Orionis A) ⓘ |
| hasMemberCount | several hundred confirmed members ⓘ |
| hasObservationWavelength |
X-ray
ⓘ
infrared ⓘ optical ⓘ |
| hasProperty |
compact
ⓘ
low extinction ⓘ rich in low-mass members ⓘ well-studied initial mass function ⓘ |
| illuminates |
IC 434
ⓘ
linked to:
IC 434 emission nebula
|
| isNamedAfter | Sigma Orionis ⓘ |
| isUsedForStudyOf |
X-ray emission from young stars
ⓘ
brown dwarf formation ⓘ initial mass function ⓘ protoplanetary disk evolution ⓘ star formation ⓘ |
| locatedIn |
Milky Way
ⓘ
Orion Molecular Cloud Complex ⓘ Orion OB1 association ⓘ
linked to:
Orion OB association
|
| locatedInConstellation | Orion ⓘ |
| partOf |
Orion OB1b subgroup
ⓘ
linked to:
Orion OB association
|
| rightAscension | approximately 05h 38m ⓘ |
| surveyedBy |
Chandra X-ray Observatory
ⓘ
Gaia spacecraft ⓘ
linked to:
Gaia observatory
Spitzer Space Telescope ⓘ XMM-Newton ⓘ
linked to:
XMM-Newton mission
|
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: σ Orionis cluster Description of subject: The σ Orionis cluster is a young, compact star cluster in the Orion constellation, notable for its massive central multiple star system and role in illuminating and shaping the surrounding Orion Molecular Cloud Complex.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: σ Orionis cluster