Messier 25
E111360
Messier 25 is an open star cluster located in the constellation Sagittarius, visible to the naked eye under dark skies.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Messier 25 canonical | 4 |
How this entity was disambiguated
This entity first appeared as the object of triple T869230 — 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 25 Context triple: [Sagittarius, contains, Messier 25]
-
A.
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.
-
B.
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.
-
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 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.
-
E.
NGC 6822
NGC 6822 is a barred irregular dwarf galaxy located in the constellation Sagittarius and is one of the nearest and best-studied galaxies outside 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: Messier 25 Target entity description: Messier 25 is an open star cluster located in the constellation Sagittarius, visible to the naked eye under dark skies.
-
A.
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.
-
B.
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.
-
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 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.
-
E.
NGC 6822
NGC 6822 is a barred irregular dwarf galaxy located in the constellation Sagittarius and is one of the nearest and best-studied galaxies outside the Milky Way.
- F. None of above. chosen
Statements (34)
| Predicate | Object |
|---|---|
| instanceOf |
Messier object
ⓘ
NGC object ⓘ open star cluster ⓘ |
| addedToMessierCatalogueBy | Charles Messier ⓘ |
| age_Myr |
90
ⓘ
90–100 ⓘ |
| angularSize_arcmin | 32 ⓘ |
| apparentMagnitudeV | 4.6 ⓘ |
| bestSeenInMonth | August ⓘ |
| catalogue |
Index Catalogue
ⓘ
Messier catalogue ⓘ New General Catalogue ⓘ |
| cataloguedAsOpenCluster | true ⓘ |
| constellation | Sagittarius ⓘ |
| containsVariableStar | U Sagittarii ⓘ |
| declination | −19° 15′ ⓘ |
| discoveredBy | Philippe Loys de Chéseaux ⓘ |
| discoveryLocation | Switzerland ⓘ |
| discoveryYear | 1745 ⓘ |
| distanceFromEarth_ly |
2000
ⓘ
2000–2200 ⓘ |
| galacticLatitude_deg | −5.7 ⓘ |
| galacticLongitude_deg | 13.9 ⓘ |
| hasApproximateNumberOfStars | 80 ⓘ |
| hasBrightestStarApparentMagnitude | 6.0 ⓘ |
| locatedInHemisphere | southern celestial hemisphere ⓘ |
| locatedInMilkyWayArm | Sagittarius Arm ⓘ |
| locatedNear |
Galactic center
ⓘ
linked to:
Milky Way center
|
| messierCatalogueNumber | 25 ⓘ |
| otherName |
IC 4725
ⓘ
M25 ⓘ NGC 4725 ⓘ |
| rightAscension | 18h 31m ⓘ |
| visibleToNakedEye | true ⓘ |
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 25 Description of subject: Messier 25 is an open star cluster located in the constellation Sagittarius, visible to the naked eye under dark skies.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.