Messier 28
E111953
Messier 28 is a dense globular star cluster located in the constellation Sagittarius, composed of hundreds of thousands of ancient stars.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Messier 28 canonical | 4 |
How this entity was disambiguated
This entity first appeared as the object of triple T869231 — 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: Messier 28 Context triple: [Sagittarius, contains, Messier 28]
-
A.
Messier 22
Messier 22 is a bright globular star cluster located near the center of the Milky Way, visible in the constellation Sagittarius and notable for being one of the closest and most easily observed clusters of its kind.
-
B.
Messier 25
Messier 25 is an open star cluster located in the constellation Sagittarius, visible to the naked eye under dark skies.
-
C.
Messier 20
Messier 20, also known as the Trifid Nebula, is a bright, star-forming emission and reflection nebula famous for its striking three-lobed appearance.
-
D.
Messier 24
Messier 24 is a rich star cloud in the constellation Sagittarius, representing a dense, bright section of the Milky Way visible through a gap in interstellar dust.
-
E.
Messier 8
Messier 8, also known as the Lagoon Nebula, is a large, bright emission nebula and active star-forming region visible in the constellation Sagittarius.
- 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: Messier 28 Target entity description: Messier 28 is a dense globular star cluster located in the constellation Sagittarius, composed of hundreds of thousands of ancient stars.
-
A.
Messier 22
Messier 22 is a bright globular star cluster located near the center of the Milky Way, visible in the constellation Sagittarius and notable for being one of the closest and most easily observed clusters of its kind.
-
B.
Messier 25
Messier 25 is an open star cluster located in the constellation Sagittarius, visible to the naked eye under dark skies.
-
C.
Messier 20
Messier 20, also known as the Trifid Nebula, is a bright, star-forming emission and reflection nebula famous for its striking three-lobed appearance.
-
D.
Messier 24
Messier 24 is a rich star cloud in the constellation Sagittarius, representing a dense, bright section of the Milky Way visible through a gap in interstellar dust.
-
E.
Messier 8
Messier 8, also known as the Lagoon Nebula, is a large, bright emission nebula and active star-forming region visible in the constellation Sagittarius.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
Messier object
ⓘ
NGC object ⓘ globular star cluster ⓘ |
| age | ~12 billion years ⓘ |
| angularSize | 11.2 arcminutes ⓘ |
| apparentMagnitudeV | 6.8 ⓘ |
| belongsTo | Local Group ⓘ |
| bestViewingSeason | summer ⓘ |
| catalog |
Messier catalogue
ⓘ
New General Catalogue ⓘ |
| catalogNumber |
GCl 99
ⓘ
M28 ⓘ NGC 6626 ⓘ |
| constellation | Sagittarius ⓘ |
| contains |
ancient low-mass stars
ⓘ
horizontal branch stars ⓘ hundreds of thousands of stars ⓘ red giant branch stars ⓘ |
| coreConcentration | high ⓘ |
| declination | −24° 52′ ⓘ |
| discoveredBy | Charles Messier ⓘ |
| discoveryDate | 1764 ⓘ |
| discoveryInstrument | refracting telescope ⓘ |
| distanceFromEarth |
~18,000 light-years
ⓘ
~5,500 parsecs ⓘ |
| evolutionaryStage | dynamically evolved globular cluster ⓘ |
| galacticComponent |
Galactic bulge
ⓘ
linked to:
Milky Way center
|
| hasColorIndexB−V | ~0.7 ⓘ |
| hostGalaxy | Milky Way ⓘ |
| is | dense globular star cluster ⓘ |
| locatedIn | Sagittarius constellation region rich in star fields ⓘ |
| locatedNear |
Galactic center
ⓘ
linked to:
Milky Way center
|
| locationInGalaxy | Milky Way ⓘ |
| metallicity | low ⓘ |
| notableFeature | contains millisecond pulsars ⓘ |
| observationalClass | visual telescopic deep-sky object ⓘ |
| observedIn |
X-ray wavelengths
ⓘ
optical wavelengths ⓘ radio wavelengths ⓘ |
| otherName |
GCl 99
ⓘ
M28 ⓘ
linked to:
M22
NGC 6626 ⓘ |
| rightAscension | 18h 24m ⓘ |
| stellarPopulation | Population II ⓘ |
| surfaceBrightness | high ⓘ |
| visibility | best seen from southern latitudes ⓘ |
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: Messier 28 Description of subject: Messier 28 is a dense globular star cluster located in the constellation Sagittarius, composed of hundreds of thousands of ancient stars.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.