Messier 30
E247367
Messier 30 is a dense globular star cluster located in the constellation Capricornus, composed of hundreds of thousands of ancient stars bound tightly by gravity.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Messier 30 canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T2233498 — 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 30 Context triple: [Capricornus, containsDeepSkyObject, Messier 30]
-
A.
Messier 28
Messier 28 is a dense globular star cluster located in the constellation Sagittarius, composed of hundreds of thousands of ancient stars.
-
B.
Messier 70
Messier 70 is a dense globular star cluster located in the constellation Sagittarius near the center of the Milky Way galaxy.
-
C.
Messier 45
Messier 45, commonly known as the Pleiades, is a prominent open star cluster in the constellation Taurus, easily visible to the naked eye and famous in many cultures worldwide.
-
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 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.
- 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 30 Target entity description: Messier 30 is a dense globular star cluster located in the constellation Capricornus, composed of hundreds of thousands of ancient stars bound tightly by gravity.
-
A.
Messier 28
Messier 28 is a dense globular star cluster located in the constellation Sagittarius, composed of hundreds of thousands of ancient stars.
-
B.
Messier 70
Messier 70 is a dense globular star cluster located in the constellation Sagittarius near the center of the Milky Way galaxy.
-
C.
Messier 45
Messier 45, commonly known as the Pleiades, is a prominent open star cluster in the constellation Taurus, easily visible to the naked eye and famous in many cultures worldwide.
-
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 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.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
Messier object
ⓘ
deep-sky object ⓘ globular star cluster ⓘ |
| absoluteMagnitudeV | −7.45 ⓘ |
| age | about 12.9 billion years ⓘ |
| alsoKnownAs |
M30
ⓘ
NGC 7099 ⓘ |
| angularSize | 12 arcminutes ⓘ |
| apparentMagnitudeV | 7.2 ⓘ |
| bestViewingMonth | August ⓘ |
| binding | gravitationally bound star cluster ⓘ |
| catalog |
Messier catalogue
ⓘ
New General Catalogue ⓘ |
| contains |
RR Lyrae variable stars
ⓘ
surface form:
RR Lyrae variables
blue straggler stars ⓘ hundreds of thousands of stars ⓘ variable stars ⓘ |
| coreCollapseStatus | core-collapsed ⓘ |
| coreConcentration | high ⓘ |
| coreRadius | about 0.05 arcminutes ⓘ |
| declination | −23° 10′ 47″ ⓘ |
| discoveredBy | Charles Messier ⓘ |
| discovererRole | French astronomer ⓘ |
| discoveryDate | 1764 ⓘ |
| distanceFromEarth |
about 27,000 light-years
ⓘ
about 8.3 kiloparsecs ⓘ |
| dominantStellarType | old, low-metallicity stars ⓘ |
| galacticLatitude | −27.3 degrees ⓘ |
| galacticLongitude | 27.2 degrees ⓘ |
| halfLightRadius | about 1.0 arcminutes ⓘ |
| locatedIn | Milky Way ⓘ |
| locatedInConstellation | Capricornus ⓘ |
| mass | about 1.6×10^5 solar masses ⓘ |
| memberOf |
Milky Way stellar halo
ⓘ
surface form:
Milky Way halo
|
| metallicity | low ⓘ |
| metallicityFeH | about −2.3 ⓘ |
| observedBy | Hubble Space Telescope ⓘ |
| observedIn |
infrared wavelengths
ⓘ
optical wavelengths ⓘ |
| OosterhoffType | II ⓘ |
| radialVelocity | about −182 km/s ⓘ |
| reddeningEBV | about 0.03 ⓘ |
| rightAscension | 21h 40m 22s ⓘ |
| skyLocation | southern sky ⓘ |
| stellarPopulation | Population II ⓘ |
| surfaceBrightness | high ⓘ |
| tidalRadius | about 18 arcminutes ⓘ |
| visibility | best seen from southern and equatorial 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 30 Description of subject: Messier 30 is a dense globular star cluster located in the constellation Capricornus, composed of hundreds of thousands of ancient stars bound tightly by gravity.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Capricornus
subject surface form:
Capricornus