Cassiopeia OB associations
E109443
The Cassiopeia OB associations are large groupings of young, massive, hot stars located in the direction of the constellation Cassiopeia within the Milky Way.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Cassiopeia OB association | 1 |
| Cassiopeia OB associations canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T934101 — 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: Cassiopeia OB associations Context triple: [Perseus Arm, contains, Cassiopeia OB associations]
-
A.
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.
-
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.
Open cluster NGC 6530
Open cluster NGC 6530 is a young, bright star cluster embedded in the Lagoon Nebula in the constellation Sagittarius, serving as a prominent site of active star formation within the Milky Way.
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D.
Messier 17
Messier 17, also known as the Omega or Swan Nebula, is a bright star-forming emission nebula located in the constellation Sagittarius.
-
E.
Orion Molecular Cloud Complex
The Orion Molecular Cloud Complex is a vast star-forming region in the constellation Orion, rich in gas, dust, and young stellar objects, and one of the most studied nurseries of massive stars in 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: Cassiopeia OB associations Target entity description: The Cassiopeia OB associations are large groupings of young, massive, hot stars located in the direction of the constellation Cassiopeia within the Milky Way.
-
A.
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.
-
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.
Open cluster NGC 6530
Open cluster NGC 6530 is a young, bright star cluster embedded in the Lagoon Nebula in the constellation Sagittarius, serving as a prominent site of active star formation within the Milky Way.
-
D.
Messier 17
Messier 17, also known as the Omega or Swan Nebula, is a bright star-forming emission nebula located in the constellation Sagittarius.
-
E.
Orion Molecular Cloud Complex
The Orion Molecular Cloud Complex is a vast star-forming region in the constellation Orion, rich in gas, dust, and young stellar objects, and one of the most studied nurseries of massive stars in the Milky Way.
- F. None of above. chosen
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
OB association
ⓘ
stellar association ⓘ |
| ageRange | a few million years ⓘ |
| associatedWith |
H II regions
ⓘ
molecular clouds ⓘ star-forming regions ⓘ |
| composedOf |
hot stars
ⓘ
massive stars ⓘ young stars ⓘ |
| contains |
blue supergiants
ⓘ
early-type stars ⓘ massive main-sequence stars ⓘ |
| distanceFromEarth | several kiloparsecs ⓘ |
| drives | stellar winds ⓘ |
| environment |
dust-rich regions
ⓘ
gas-rich regions ⓘ |
| hasKinematics | similar space motion of member stars ⓘ |
| hasMemberType |
OB stars
ⓘ
pre-main-sequence stars ⓘ runaway stars ⓘ |
| influences | interstellar medium ⓘ |
| isPartOf | Galactic OB associations ⓘ |
| locatedIn |
Galactic disk
ⓘ
Perseus Arm ⓘ |
| locatedInConstellation | Cassiopeia ⓘ |
| locatedInGalaxy | Milky Way ⓘ |
| membershipCriterion |
common proper motion
ⓘ
similar age ⓘ similar radial velocity ⓘ |
| observationalChallenge | line-of-sight confusion in the Galactic plane ⓘ |
| observationalMethod |
Gaia astrometry
ⓘ
photometric surveys ⓘ spectroscopic surveys ⓘ |
| observedIn |
optical wavelengths
ⓘ
radio wavelengths ⓘ ultraviolet wavelengths ⓘ |
| roleInGalaxy |
drivers of feedback in the interstellar medium
ⓘ
sites of recent star formation ⓘ sources of ionizing radiation ⓘ |
| stellarPopulationType | Population I ⓘ |
| studiedIn |
Galactic structure studies
ⓘ
massive star formation research ⓘ |
| traces | spiral structure of the Milky Way ⓘ |
| typicalSpectralTypes |
B-type stars
ⓘ
O-type 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: Cassiopeia OB associations Description of subject: The Cassiopeia OB associations are large groupings of young, massive, hot stars located in the direction of the constellation Cassiopeia within the Milky Way.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
IC 1805
this entity surface form:
Cassiopeia OB association