Messier 45
E120917
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.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Messier 45 canonical | 7 |
How this entity was disambiguated
This entity first appeared as the object of triple T869998 — 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 45 Context triple: [M45, alsoKnownAs, Messier 45]
-
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 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.
-
D.
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.
-
E.
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.
- 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 45 Target entity description: 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.
-
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 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.
-
D.
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.
-
E.
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.
- F. None of above. chosen
Statements (52)
| Predicate | Object |
|---|---|
| instanceOf |
Messier object
ⓘ
astronomical object ⓘ deep-sky object ⓘ open star cluster ⓘ |
| age | about 100 million years ⓘ |
| alsoKnownAs |
M45
ⓘ
Pleiades ⓘ Seven Sisters ⓘ |
| angularSize | about 110 arcminutes ⓘ |
| apparentMagnitudeV | 1.6 ⓘ |
| bestSeenIn |
Northern Celestial Hemisphere
ⓘ
surface form:
Northern Hemisphere
|
| bestViewingSeason | late autumn and winter ⓘ |
| brightestStarsVisibleToNakedEye | about 6 to 9 ⓘ |
| catalogCode |
M45
ⓘ
Melotte 22 ⓘ NGC 1432 ⓘ |
| clusterType | young open cluster ⓘ |
| containsStar |
Alcyone
ⓘ
Asterope ⓘ Atlas ⓘ Celaeno ⓘ Electra ⓘ Maia ⓘ Merope ⓘ Pleione ⓘ Taygeta ⓘ |
| culturalSignificance |
important in Greek mythology
ⓘ
important in Japanese folklore ⓘ important in Māori traditions ⓘ important in Native American traditions ⓘ |
| declination | +24° 07′ ⓘ |
| discoveredBy | known since antiquity ⓘ |
| distanceFromEarth |
about 136 parsecs
ⓘ
about 444 light-years ⓘ |
| dominantSpectralType | B-type main-sequence stars ⓘ |
| galacticLatitude | about -23° ⓘ |
| galacticLongitude | about 166° ⓘ |
| greekMythologyAssociation | the Seven Sisters, daughters of Atlas and Pleione ⓘ |
| hasFeature | reflection nebulae ⓘ |
| hasProperMotion | moving together through space as a bound cluster ⓘ |
| includedInCatalogBy | Charles Messier ⓘ |
| interstellarMediumOrigin | unrelated passing dust cloud ⓘ |
| japaneseName | Subaru ⓘ |
| locatedIn | Milky Way ⓘ |
| locatedInConstellation | Taurus ⓘ |
| mass | around 800 solar masses ⓘ |
| messierCatalogNumber | 45 ⓘ |
| nebulaType | reflection nebula ⓘ |
| numberOfStars | over 1000 ⓘ |
| rightAscension | 03h 47m ⓘ |
| usedInLogoOf | Subaru automobile brand ⓘ |
| visibility | visible to naked eye ⓘ |
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 45 Description of subject: 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.
Referenced by (7)
Full triples — surface form annotated when it differs from this entity's canonical label.