Flamsteed designation 21 Tauri
E528148
Flamsteed designation 21 Tauri is a star in the Pleiades open star cluster in the constellation Taurus, traditionally known as Sterope I.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Flamsteed designation 21 Tauri canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5541467 — 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: Flamsteed designation 21 Tauri Context triple: [Sterope I, hasCatalogDesignation, Flamsteed designation 21 Tauri]
-
A.
23 Tauri
23 Tauri is a star in the constellation Taurus, cataloged as part of the Pleiades star cluster.
-
B.
Zeta Telescopii
Zeta Telescopii is a prominent star in the southern constellation Telescopium, visible to the naked eye under good observing conditions.
-
C.
Alpha Telescopii
Alpha Telescopii is a blue-white giant star that serves as the primary luminary of the southern constellation Telescopium.
-
D.
Kappa Tucanae
Kappa Tucanae is a star system located in the southern constellation Tucana.
-
E.
87 Tauri
87 Tauri is a star in the constellation Taurus, known as the Flamsteed-designated counterpart of the bright giant Aldebaran.
- 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: Flamsteed designation 21 Tauri Target entity description: Flamsteed designation 21 Tauri is a star in the Pleiades open star cluster in the constellation Taurus, traditionally known as Sterope I.
-
A.
23 Tauri
23 Tauri is a star in the constellation Taurus, cataloged as part of the Pleiades star cluster.
-
B.
Zeta Telescopii
Zeta Telescopii is a prominent star in the southern constellation Telescopium, visible to the naked eye under good observing conditions.
-
C.
Alpha Telescopii
Alpha Telescopii is a blue-white giant star that serves as the primary luminary of the southern constellation Telescopium.
-
D.
Kappa Tucanae
Kappa Tucanae is a star system located in the southern constellation Tucana.
-
E.
87 Tauri
87 Tauri is a star in the constellation Taurus, known as the Flamsteed-designated counterpart of the bright giant Aldebaran.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
Flamsteed star
ⓘ
Pleiades member ⓘ main-sequence star ⓘ star ⓘ |
| age | about 100 million years ⓘ |
| apparentMagnitudeV | 5.76 ⓘ |
| associatedWith |
Seven Sisters asterism
ⓘ
linked to:
Pleiades
|
| belongsTo |
Gould Belt region
ⓘ
linked to:
Gould Belt
|
| belongsToCluster | M45 ⓘ |
| catalogDesignation |
BD+23 474
ⓘ
Gaia DR3 330235979799822720 ⓘ
linked to:
Gaia Data Release 3
HD 23324 ⓘ HIP 17499 ⓘ HR 1140 ⓘ SAO 76199 ⓘ |
| colorIndexB−V | −0.06 ⓘ |
| componentOf |
Pleiades reflection nebula region
ⓘ
linked to:
Pleiades reflection nebulae
|
| constellation | Taurus ⓘ |
| declination | +24° 33′ 17″ ⓘ |
| distanceFromEarth |
about 135 parsecs
ⓘ
about 440 light-years ⓘ |
| effectiveTemperature | about 12000 K ⓘ |
| equatorialCoordinateSystem |
ICRS
ⓘ
linked to:
International Celestial Reference System
|
| galacticPopulation | Population I star ⓘ |
| hasBayerDesignation | none ⓘ |
| hasCompanion | visual companion ⓘ |
| hasFlamsteedNumber | 21 ⓘ |
| hasTraditionalNameOrigin | Greek mythology ⓘ |
| hemisphere | Northern celestial hemisphere ⓘ |
| isPartOfAsterism |
Pleiades
ⓘ
linked to:
Pleiades open cluster
|
| locatedIn |
Milky Way
ⓘ
Pleiades open cluster ⓘ |
| luminosity | about 160 times solar luminosity ⓘ |
| mass | about 3 solar masses ⓘ |
| metallicity | near-solar ⓘ |
| mythologicalAssociation | Sterope, one of the Pleiades sisters ⓘ |
| observedIn |
infrared wavelengths
ⓘ
optical wavelengths ⓘ |
| parallax | 7.45 mas ⓘ |
| properMotionDec | −45.50 mas/yr ⓘ |
| properMotionRA | +20.40 mas/yr ⓘ |
| radialVelocity | +6 km/s ⓘ |
| radius | about 3 solar radii ⓘ |
| rightAscension | 03h 45m 54s ⓘ |
| rotationalVelocity | about 140 km/s ⓘ |
| spectralType | B8V ⓘ |
| traditionalName |
Sterope I
ⓘ
linked to:
Sterope
|
| variableStarType | suspected variable ⓘ |
| visibleToNakedEye | yes ⓘ |
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: Flamsteed designation 21 Tauri Description of subject: Flamsteed designation 21 Tauri is a star in the Pleiades open star cluster in the constellation Taurus, traditionally known as Sterope I.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject linked to:
star Sterope I