Messier 75
E118336
Messier 75 is a densely concentrated globular star cluster located in the constellation Sagittarius, notable for its great distance from Earth and rich population of ancient stars.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Messier 75 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T869236 — 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 75 Context triple: [Sagittarius, contains, Messier 75]
-
A.
Messier 70
Messier 70 is a dense globular star cluster located in the constellation Sagittarius near the center of the Milky Way galaxy.
-
B.
Messier 69
Messier 69 is a dense, metal-rich globular star cluster located in the constellation Sagittarius near the center of the Milky Way.
-
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 54
Messier 54 is a dense globular star cluster located in the constellation Sagittarius, notable for being one of the first globular clusters found to belong to a dwarf galaxy outside the Milky Way.
-
E.
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.
- 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 75 Target entity description: Messier 75 is a densely concentrated globular star cluster located in the constellation Sagittarius, notable for its great distance from Earth and rich population of ancient stars.
-
A.
Messier 70
Messier 70 is a dense globular star cluster located in the constellation Sagittarius near the center of the Milky Way galaxy.
-
B.
Messier 69
Messier 69 is a dense, metal-rich globular star cluster located in the constellation Sagittarius near the center of the Milky Way.
-
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 54
Messier 54 is a dense globular star cluster located in the constellation Sagittarius, notable for being one of the first globular clusters found to belong to a dwarf galaxy outside the Milky Way.
-
E.
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.
- F. None of above. chosen
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
Messier object
ⓘ
NGC object ⓘ globular star cluster ⓘ |
| absoluteMagnitudeV | −8.57 ⓘ |
| age | ~13 billion years ⓘ |
| angularSize | 6.8 arcminutes ⓘ |
| apparentMagnitudeV | 8.5 ⓘ |
| belongsTo |
Milky Way stellar halo
ⓘ
surface form:
Milky Way halo
|
| bestObservedInMonth | August ⓘ |
| catalog |
Messier catalogue
ⓘ
surface form:
Messier Catalogue
New General Catalogue ⓘ |
| cataloguedBy | Charles Messier ⓘ |
| constellation | Sagittarius ⓘ |
| coreConcentrationClass | II ⓘ |
| coreRadius | ~0.44 arcminutes ⓘ |
| declination | −21° 55′ 17″ ⓘ |
| discoverer | Pierre Méchain ⓘ |
| discoveryDate | 1780 ⓘ |
| discoveryMethod | telescopic observation ⓘ |
| distanceFromEarth |
~20.7 kiloparsecs
ⓘ
~67,500 light-years ⓘ |
| distanceFromGalacticCenter | ~14.7 kiloparsecs ⓘ |
| galacticLatitude | −25.75° ⓘ |
| galacticLongitude | 12.18° ⓘ |
| halfLightRadius | ~0.86 arcminutes ⓘ |
| hemisphereVisibility | Southern sky ⓘ |
| locatedIn | Milky Way ⓘ |
| mass | ~1,000,000 solar masses ⓘ |
| MessierNumber | 75 ⓘ |
| metallicityFeH | −1.29 ⓘ |
| NGCNumber | 6864 ⓘ |
| notableFeature |
rich population of old, metal-poor stars
ⓘ
very high central concentration of stars ⓘ |
| observedIn | optical wavelengths ⓘ |
| otherName |
GCl 117
ⓘ
M75 ⓘ NGC 6864 ⓘ |
| population | ancient stars ⓘ |
| radialVelocity | ~−190 km/s ⓘ |
| rightAscension | 20h 06m 05.0s ⓘ |
| ShapleySawyerConcentrationClass | I ⓘ |
| skyLocation | near the border of Sagittarius and Capricornus ⓘ |
| stellarPopulationType | Population II ⓘ |
| surfaceBrightness | high ⓘ |
| visibility | best seen with small telescope ⓘ |
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 75 Description of subject: Messier 75 is a densely concentrated globular star cluster located in the constellation Sagittarius, notable for its great distance from Earth and rich population of ancient stars.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.