Orion OB association
E459015
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.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Orion OB1 association | 6 |
| Orion OB1b subgroup | 2 |
| Orion OB association canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4617520 — 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: Orion OB association Context triple: [Gould Belt, contains, Orion OB association]
-
A.
Monoceros OB2 association
Monoceros OB2 association is a large stellar grouping in the constellation Monoceros, notable for its young, massive stars and active star-forming regions such as the Rosette Nebula.
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B.
Perseus OB2 association
Perseus OB2 association is a nearby group of young, massive OB-type stars located in the Perseus constellation region of the Milky Way.
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C.
Scorpius–Centaurus OB association
The Scorpius–Centaurus OB association is the nearest large group of young, massive stars to the Sun, spanning the constellations Scorpius and Centaurus and playing a key role in studies of recent star formation in our Galactic neighborhood.
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D.
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.
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E.
Cassiopeia OB associations
The Cassiopeia OB associations are large groupings of young, massive, hot stars located in the direction of the constellation Cassiopeia within the Milky Way.
- 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: Orion OB association Target entity description: 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.
-
A.
Monoceros OB2 association
Monoceros OB2 association is a large stellar grouping in the constellation Monoceros, notable for its young, massive stars and active star-forming regions such as the Rosette Nebula.
-
B.
Perseus OB2 association
Perseus OB2 association is a nearby group of young, massive OB-type stars located in the Perseus constellation region of the Milky Way.
-
C.
Scorpius–Centaurus OB association
The Scorpius–Centaurus OB association is the nearest large group of young, massive stars to the Sun, spanning the constellations Scorpius and Centaurus and playing a key role in studies of recent star formation in our Galactic neighborhood.
-
D.
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.
-
E.
Cassiopeia OB associations
The Cassiopeia OB associations are large groupings of young, massive, hot stars located in the direction of the constellation Cassiopeia within the Milky Way.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
OB association
ⓘ
stellar association ⓘ |
| affects | surrounding molecular clouds ⓘ |
| age | a few million years ⓘ |
| ageRange | approximately 1–12 million years ⓘ |
| associatedWith |
Orion A molecular cloud
NERFINISHED
ⓘ
Orion B molecular cloud NERFINISHED ⓘ |
| contains |
T Tauri stars
ⓘ
pre-main-sequence stars ⓘ young massive stars ⓘ |
| containsObject |
Flame Nebula region
NERFINISHED
ⓘ
Horsehead Nebula region NERFINISHED ⓘ NGC 1977 NERFINISHED ⓘ Orion Nebula (M42) NERFINISHED ⓘ |
| containsRegion |
Orion Belt region
NERFINISHED
ⓘ
Orion Sword region NERFINISHED ⓘ |
| containsSubgroup |
Orion OB1a subgroup
NERFINISHED
ⓘ
Orion OB1b subgroup NERFINISHED ⓘ Orion OB1c subgroup NERFINISHED ⓘ Orion OB1d subgroup NERFINISHED ⓘ |
| distanceFromEarth |
approximately 1100–1500 light-years
ⓘ
approximately 350–450 parsecs ⓘ |
| dominantStellarTypes |
B-type stars
ⓘ
O-type stars ⓘ |
| hasAlternativeName | Orion OB1 association NERFINISHED ⓘ |
| hasBeenStudiedUsing |
X-ray observations
ⓘ
infrared observations ⓘ optical observations ⓘ radio observations ⓘ |
| hasKinematicProperty | expanding stellar groups ⓘ |
| hasStarFormationHistory | sequential star formation ⓘ |
| importance | prototype OB association in the solar neighborhood ⓘ |
| influences | interstellar medium in Orion region ⓘ |
| isNearby | Sun NERFINISHED ⓘ |
| isPartOf | local spiral arm (Orion Arm) NERFINISHED ⓘ |
| locatedIn | Milky Way ⓘ |
| locatedInConstellation | Orion NERFINISHED ⓘ |
| partOf | Orion molecular cloud complex NERFINISHED ⓘ |
| radiationField | strong ultraviolet radiation from OB stars ⓘ |
| roleInAstrophysics |
important region for studying massive star formation
ⓘ
important region for studying triggered star formation ⓘ key laboratory for studying recent star formation ⓘ |
| skyLocation | near celestial equator ⓘ |
| stellarPopulation |
massive OB stars
ⓘ
predominantly young stars ⓘ |
| subdividedInto | Orion OB1 association NERFINISHED ⓘ |
| usedToStudy |
feedback from massive stars on molecular clouds
ⓘ
initial mass function of young stellar populations ⓘ |
| visibility | visible from both hemispheres ⓘ |
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: Orion OB association Description of subject: 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.
Referenced by (9)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Orion OB1 association
this entity surface form:
Orion OB1 association
this entity surface form:
Orion OB1b subgroup
this entity surface form:
Orion OB1 association