Cepheus OB2 association
E492802
The Cepheus OB2 association is a large, young stellar grouping in the constellation Cepheus, containing numerous massive O- and B-type stars and active star-forming regions.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Cepheus OB2 association canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T4886097 — 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: Cepheus OB2 association Context triple: [NGC 7538, partOf, Cepheus OB2 association]
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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.
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.
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D.
Cygnus OB2 association
Cygnus OB2 association is a massive, young stellar grouping rich in hot, luminous O- and B-type stars located in the constellation Cygnus.
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E.
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.
- 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: Cepheus OB2 association Target entity description: The Cepheus OB2 association is a large, young stellar grouping in the constellation Cepheus, containing numerous massive O- and B-type stars and active star-forming regions.
-
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.
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.
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D.
Cygnus OB2 association
Cygnus OB2 association is a massive, young stellar grouping rich in hot, luminous O- and B-type stars located in the constellation Cygnus.
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E.
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.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
OB association
ⓘ
stellar association ⓘ |
| age | a few million years ⓘ |
| ageGroup | young stellar population ⓘ |
| angularExtent | several degrees on the sky ⓘ |
| catalogDesignation | Cep OB2 ⓘ |
| constellation | Cepheus ⓘ |
| contains |
Cepheus Bubble
ⓘ
H II regions ⓘ Herbig Ae/Be stars ⓘ IC 1396 H II region ⓘ IC 1396A Elephant Trunk Nebula ⓘ
linked to:
IC 1396 H II region
T Tauri stars ⓘ active star-forming regions ⓘ massive B-type stars ⓘ massive O-type stars ⓘ molecular clouds ⓘ open cluster NGC 7160 ⓘ open cluster Trumpler 37 ⓘ pre-main-sequence stars ⓘ reflection nebulae ⓘ young stellar objects ⓘ |
| discoveredBy | early 20th century stellar surveys ⓘ |
| distanceFromEarth |
approximately 2600 to 3300 light-years
ⓘ
approximately 800 to 1000 parsecs ⓘ |
| feedbackProcesses |
stellar winds from massive stars
ⓘ
supernova explosions ⓘ |
| galacticEnvironment | local spiral arm segment near the Sun ⓘ |
| hasMember |
massive star HD 206183
ⓘ
massive star HD 206267 ⓘ massive star HD 239710 ⓘ |
| hasSubgroup |
Cep OB2a
ⓘ
Cep OB2b ⓘ |
| influences | surrounding molecular clouds ⓘ |
| locatedIn |
Milky Way
ⓘ
Orion Arm ⓘ |
| observedIn |
X-ray wavelengths
ⓘ
infrared wavelengths ⓘ optical wavelengths ⓘ |
| researchTopic |
circumstellar disks in young clusters
ⓘ
evolution of OB associations ⓘ massive star formation ⓘ triggered star formation ⓘ |
| skyLocation | northern celestial hemisphere ⓘ |
| starFormationActivity | ongoing ⓘ |
| starFormationHistory | sequential star formation ⓘ |
| stellarPopulation |
low-mass pre-main-sequence stars
ⓘ
massive OB stars ⓘ |
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: Cepheus OB2 association Description of subject: The Cepheus OB2 association is a large, young stellar grouping in the constellation Cepheus, containing numerous massive O- and B-type stars and active star-forming regions.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.