Messier 2
E867055
Messier 2 is a bright, densely populated globular star cluster located in the constellation Aquarius, notable for its great age and rich population of ancient stars.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Messier 2 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T10489008 — 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 2 Context triple: [Aquarius, containsDeepSkyObject, Messier 2]
-
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 4
Messier 4 is a bright, nearby globular star cluster located in the constellation Scorpius and is one of the easiest globular clusters to observe with small telescopes.
-
C.
Messier 28
Messier 28 is a dense globular star cluster located in the constellation Sagittarius, composed of hundreds of thousands of ancient stars.
-
D.
Messier 26
Messier 26 is an open star cluster located in the constellation Scutum, notable for its relatively compact grouping of stars and moderate brightness.
-
E.
Messier 21
Messier 21 is a young open star cluster in the constellation Sagittarius, notable for its bright, densely packed hot stars and proximity to the Trifid Nebula.
- 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 2 Target entity description: Messier 2 is a bright, densely populated globular star cluster located in the constellation Aquarius, notable for its great age and rich population 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 4
Messier 4 is a bright, nearby globular star cluster located in the constellation Scorpius and is one of the easiest globular clusters to observe with small telescopes.
-
C.
Messier 28
Messier 28 is a dense globular star cluster located in the constellation Sagittarius, composed of hundreds of thousands of ancient stars.
-
D.
Messier 26
Messier 26 is an open star cluster located in the constellation Scutum, notable for its relatively compact grouping of stars and moderate brightness.
-
E.
Messier 21
Messier 21 is a young open star cluster in the constellation Sagittarius, notable for its bright, densely packed hot stars and proximity to the Trifid Nebula.
- F. None of above. chosen
Statements (43)
| Predicate | Object |
|---|---|
| instanceOf | globular star cluster ⓘ |
| absoluteMagnitudeV | about −9.0 ⓘ |
| addedToMessierCatalogueBy | Charles Messier ⓘ |
| age | about 13 billion years ⓘ |
| angularSize | 16 arcminutes ⓘ |
| apparentMagnitudeV | 6.3 ⓘ |
| belongsTo | outer halo globular cluster population ⓘ |
| bestSeenIn | September ⓘ |
| concentrationClass | II ⓘ |
| contains | blue straggler stars ⓘ |
| declination | −00° 49′ 24″ ⓘ |
| discoveredBy | Jean-Dominique Maraldi ⓘ |
| discoveryDate | 1746 ⓘ |
| distanceFromEarth |
about 11.5 kiloparsecs
ⓘ
about 37,500 light-years ⓘ |
| galacticLatitude | −35.77 degrees ⓘ |
| galacticLongitude | 53.37 degrees ⓘ |
| hasAlternativeName |
M 2
ⓘ
NGC7089 ⓘ
linked to:
NGC 7089
|
| hasColorIndexBminusV | about 0.80 ⓘ |
| hasCoreRadius | about 0.34 arcminutes ⓘ |
| hasDesignation |
M2
ⓘ
NGC 7089 ⓘ |
| hasHalfLightRadius | about 1.02 arcminutes ⓘ |
| hasShape | slightly elliptical ⓘ |
| hasStellarPopulation | Population II ⓘ |
| isCataloguedIn |
Messier catalogue
ⓘ
New General Catalogue ⓘ |
| isNotableFor |
great age
ⓘ
high central stellar density ⓘ low metallicity ⓘ |
| isRichIn |
old stars
ⓘ
red giant stars ⓘ |
| isVisibleWith |
binoculars under dark skies
ⓘ
small telescope ⓘ |
| locatedIn |
Galactic halo
ⓘ
Milky Way ⓘ |
| locatedInConstellation | Aquarius ⓘ |
| messierCatalogueEntryYear | 1760 ⓘ |
| metallicityFeH | about −1.6 ⓘ |
| radialVelocity | about −5 km/s ⓘ |
| rightAscension | 21h 33m 27s ⓘ |
| totalLuminosity | about 100,000 times solar luminosity ⓘ |
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 2 Description of subject: Messier 2 is a bright, densely populated globular star cluster located in the constellation Aquarius, notable for its great age and rich population of ancient stars.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.