NGC 1818
E516572
NGC 1818 is a young, massive star cluster located in the Large Magellanic Cloud, notable for its dense population of hot, blue stars.
All labels observed (1)
| Label | Occurrences |
|---|---|
| NGC 1818 canonical | 3 |
How this entity was disambiguated
This entity first appeared as the object of triple T4943498 — 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: NGC 1818 Context triple: [Dorado, contains, NGC 1818]
-
A.
NGC 1850
NGC 1850 is a massive, young star cluster in the Large Magellanic Cloud notable for its unusual structure and intense star-forming activity.
-
B.
NGC 185
NGC 185 is a dwarf spheroidal satellite galaxy of the Andromeda Galaxy, notable for its proximity to the Milky Way and its population of old stars and star clusters.
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C.
NGC 6618
NGC 6618 is a young, massive open star cluster embedded in the Omega Nebula (M17), notable for its intense star formation and luminous, hot stars.
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D.
NGC 6868
NGC 6868 is an elliptical galaxy located in the southern constellation Telescopium, notable for its membership in a small galaxy group and its relatively bright, smooth stellar profile.
-
E.
NGC 1763
NGC 1763 is a bright emission nebula and star-forming region located in the Large Magellanic Cloud.
- 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: NGC 1818 Target entity description: NGC 1818 is a young, massive star cluster located in the Large Magellanic Cloud, notable for its dense population of hot, blue stars.
-
A.
NGC 1850
NGC 1850 is a massive, young star cluster in the Large Magellanic Cloud notable for its unusual structure and intense star-forming activity.
-
B.
NGC 185
NGC 185 is a dwarf spheroidal satellite galaxy of the Andromeda Galaxy, notable for its proximity to the Milky Way and its population of old stars and star clusters.
-
C.
NGC 6618
NGC 6618 is a young, massive open star cluster embedded in the Omega Nebula (M17), notable for its intense star formation and luminous, hot stars.
-
D.
NGC 6868
NGC 6868 is an elliptical galaxy located in the southern constellation Telescopium, notable for its membership in a small galaxy group and its relatively bright, smooth stellar profile.
-
E.
NGC 1763
NGC 1763 is a bright emission nebula and star-forming region located in the Large Magellanic Cloud.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
open star cluster
ⓘ
stellar cluster in the Large Magellanic Cloud ⓘ young massive star cluster ⓘ |
| catalogCode | NGC 1818 ⓘ |
| discoveredBy | James Dunlop ⓘ |
| discoveryYear | 1826 (approx) ⓘ |
| distanceFromEarth |
~160000 light-years
ⓘ
~49 kiloparsecs ⓘ |
| hasAge | ~25–40 million years ⓘ |
| hasAlternativeDescription | dense cluster of hot blue stars in the LMC ⓘ |
| hasAngularSize | ~2.0 arcminutes ⓘ |
| hasApparentMagnitudeV | ~9.7 ⓘ |
| hasClusterType | young populous cluster ⓘ |
| hasColorMagnitudeDiagram |
extended main-sequence turnoff
ⓘ
well-populated main sequence ⓘ |
| hasCoreRadius | a few parsecs (approx) ⓘ |
| hasDeclination | −66° (approx) ⓘ |
| hasEnvironment | star-forming region in the LMC ⓘ |
| hasHighStellarDensity | true ⓘ |
| hasIntegratedSpectralType | dominated by early-type stars ⓘ |
| hasLuminosityClass | cluster of luminous main-sequence stars ⓘ |
| hasMass | several 10^4 solar masses (approx) ⓘ |
| hasMetallicity | sub-solar metallicity ⓘ |
| hasRightAscension | 05h 04m (approx) ⓘ |
| hasStellarPopulation |
blue straggler stars
ⓘ
hot blue stars ⓘ massive main-sequence stars ⓘ pre-main-sequence stars ⓘ |
| hostGalaxy | Large Magellanic Cloud ⓘ |
| isExampleOf |
extragalactic star cluster
ⓘ
young massive cluster outside the Milky Way ⓘ |
| isPartOf | LMC bar region (approx) ⓘ |
| isRichCluster | true ⓘ |
| isTargetIn | HST imaging surveys of LMC clusters ⓘ |
| isYoungerThan | 100 million years ⓘ |
| locatedIn |
Large Magellanic Cloud
ⓘ
constellation Dorado ⓘ |
| memberOf | New General Catalogue ⓘ |
| observedBy | Hubble Space Telescope ⓘ |
| observedIn |
optical wavelengths
ⓘ
ultraviolet wavelengths ⓘ |
| showsMassSegregation | true ⓘ |
| usedForStudyOf |
blue straggler formation mechanisms
ⓘ
dynamical evolution of young star clusters ⓘ mass segregation in star clusters ⓘ stellar evolution in low-metallicity environments ⓘ |
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: NGC 1818 Description of subject: NGC 1818 is a young, massive star cluster located in the Large Magellanic Cloud, notable for its dense population of hot, blue stars.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject linked to:
constellation Dorado