Cygnus OB2 association
E477914
Cygnus OB2 association is a massive, young stellar grouping rich in hot, luminous O- and B-type stars located in the constellation Cygnus.
All labels observed (5)
| Label | Occurrences |
|---|---|
| Cygnus OB2 association canonical | 4 |
| Cyg OB2 | 1 |
| Cygnus OB2 #12 | 1 |
| Cygnus OB9 association | 1 |
| DR21 star-forming region | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4617873 — 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: Cygnus OB2 association Context triple: [Local Arm, contains, Cygnus OB2 association]
-
A.
Vela OB2 association
Vela OB2 association is a nearby, young stellar grouping in the constellation Vela, rich in massive, hot stars and active star formation.
-
B.
Sagittarius OB association region
The Sagittarius OB association region is a vast star-forming complex in the constellation Sagittarius, rich in young, massive O- and B-type stars and embedded open clusters.
-
C.
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.
-
D.
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.
-
E.
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.
- 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: Cygnus OB2 association Target entity description: Cygnus OB2 association is a massive, young stellar grouping rich in hot, luminous O- and B-type stars located in the constellation Cygnus.
-
A.
Vela OB2 association
Vela OB2 association is a nearby, young stellar grouping in the constellation Vela, rich in massive, hot stars and active star formation.
-
B.
Sagittarius OB association region
The Sagittarius OB association region is a vast star-forming complex in the constellation Sagittarius, rich in young, massive O- and B-type stars and embedded open clusters.
-
C.
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.
-
D.
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.
-
E.
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.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
OB association
ⓘ
stellar association ⓘ young massive star cluster candidate ⓘ |
| age |
approximately 1 to 7 million years
ⓘ
young stellar population ⓘ |
| apparentSize | several degrees on the sky ⓘ |
| catalogDesignation |
Cyg OB2
ⓘ
linked to:
Cygnus OB2 association
|
| containsStarType |
B-type star
ⓘ
O-type star ⓘ low-mass star ⓘ massive star ⓘ pre-main-sequence star ⓘ |
| discoveryMethod | photographic surveys of the Cygnus region ⓘ |
| distanceFromEarth |
approximately 1.4 kiloparsecs
ⓘ
approximately 4,600 light-years ⓘ |
| environment |
dense molecular cloud complex
ⓘ
highly obscured region of the Galactic plane ⓘ |
| galacticEnvironment | inner region of the Local spiral arm ⓘ |
| galacticLatitude | low galactic latitude ⓘ |
| hasAssociatedObject |
Cygnus OB2 #12
ⓘ
linked to:
Cygnus OB2 association
Cygnus OB2 #5 ⓘ Cygnus OB2 #8A ⓘ |
| hasAssociatedPhenomenon |
X-ray emission from young stars
ⓘ
intense ultraviolet radiation field ⓘ ongoing star formation in surrounding molecular clouds ⓘ photoionization of surrounding gas ⓘ strong stellar winds ⓘ |
| locatedIn |
Cygnus X star-forming complex
ⓘ
linked to:
Cygnus X star-forming region
Milky Way ⓘ |
| locatedInConstellation | Cygnus ⓘ |
| mass | on the order of 10^4 to 10^5 solar masses ⓘ |
| notableFeature |
embedded in heavy interstellar extinction
ⓘ
one of the most massive OB associations in the Milky Way ⓘ rich in hot, luminous stars ⓘ |
| obscuration | heavily reddened by interstellar dust ⓘ |
| observedInWavelength |
X-ray
ⓘ
infrared ⓘ optical ⓘ radio ⓘ |
| partOf | Local Arm ⓘ |
| researchUse |
laboratory for massive star formation studies
ⓘ
study of feedback from massive stars ⓘ testbed for initial mass function in massive clusters ⓘ |
| stellarContent |
hundreds of O-type stars
ⓘ
tens of thousands of lower-mass stars ⓘ thousands of B-type stars ⓘ |
| visibility | visible from Northern Hemisphere ⓘ |
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: Cygnus OB2 association Description of subject: Cygnus OB2 association is a massive, young stellar grouping rich in hot, luminous O- and B-type stars located in the constellation Cygnus.
Referenced by (8)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Cygnus OB2 association
linked to: Cygnus OB2 association
linked to: Cygnus OB2 association
linked to: Cygnus OB2 association