Messier 12
E486469
Messier 12 is a globular star cluster located in the constellation Ophiuchus, notable for its relatively loose structure and rich population of ancient stars.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Messier 12 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4911776 — 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 12 Context triple: [Ophiuchus, containsDeepSkyObject, Messier 12]
-
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 11
Messier 11 is a rich, compact open star cluster in the constellation Scutum, notable for its high stellar density and nickname "the Wild Duck Cluster."
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C.
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.
-
D.
Messier 55
Messier 55 is a large, relatively loose globular star cluster located in the constellation Sagittarius, visible in small telescopes as a faint, diffuse ball of stars.
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E.
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.
- 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 12 Target entity description: Messier 12 is a globular star cluster located in the constellation Ophiuchus, notable for its relatively loose structure 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 11
Messier 11 is a rich, compact open star cluster in the constellation Scutum, notable for its high stellar density and nickname "the Wild Duck Cluster."
-
C.
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.
-
D.
Messier 55
Messier 55 is a large, relatively loose globular star cluster located in the constellation Sagittarius, visible in small telescopes as a faint, diffuse ball of stars.
-
E.
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.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
Messier object
ⓘ
NGC object ⓘ globular star cluster ⓘ |
| absoluteMagnitudeV | about −7.3 ⓘ |
| age | about 12.6 billion years ⓘ |
| alsoKnownAs |
M12
NERFINISHED
ⓘ
NGC 6218 NERFINISHED ⓘ |
| angularSize | 14.5 arcminutes ⓘ |
| apparentMagnitudeB | 7.68 ⓘ |
| apparentMagnitudeRangeOfStars | down to about magnitude 13 ⓘ |
| apparentMagnitudeV | 6.7 ⓘ |
| belongsTo | Milky Way globular cluster system NERFINISHED ⓘ |
| bestSeenFrom | Northern Hemisphere NERFINISHED ⓘ |
| bestViewingSeason | late spring ⓘ |
| canBeObservedWith | small telescope ⓘ |
| catalog |
Messier catalogue
NERFINISHED
ⓘ
New General Catalogue NERFINISHED ⓘ |
| contains |
ancient stars
ⓘ
blue straggler stars ⓘ horizontal branch stars ⓘ red giant branch stars ⓘ |
| coreRadius | about 1.77 arcminutes ⓘ |
| declination | −01° 56′ 54″ ⓘ |
| discoveredAs | nebula without stars ⓘ |
| discoveredBy | Charles Messier NERFINISHED ⓘ |
| discoveryDate | 1764 ⓘ |
| distanceFromEarth |
about 16,000 light-years
ⓘ
about 4.9 kiloparsecs ⓘ |
| epoch | J2000 ⓘ |
| galacticLatitude | 26.31 degrees ⓘ |
| galacticLongitude | 15.72 degrees ⓘ |
| halfLightRadius | about 3.0 arcminutes ⓘ |
| hasColorIndexBminusV | about 0.73 ⓘ |
| hasLooseStructure | true ⓘ |
| heliocentricRadialVelocity | about +16 km/s ⓘ |
| isNearOnSky | Messier 10 NERFINISHED ⓘ |
| locatedIn |
Galactic halo
ⓘ
Milky Way ⓘ |
| locatedInConstellation | Ophiuchus NERFINISHED ⓘ |
| metallicityFeH | about −1.3 ⓘ |
| notableFor |
relatively loose structure
ⓘ
rich population of ancient stars ⓘ |
| observedBy | Hubble Space Telescope NERFINISHED ⓘ |
| partOf | Ophiuchus constellation region NERFINISHED ⓘ |
| rightAscension | 16h 47m 14s ⓘ |
| ShapleySawyerConcentrationClass | IX ⓘ |
| tidalRadius | about 17.6 arcminutes ⓘ |
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 12 Description of subject: Messier 12 is a globular star cluster located in the constellation Ophiuchus, notable for its relatively loose structure and rich population of ancient stars.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.