Alpha Geminorum
E531022
Alpha Geminorum, also known as Castor, is one of the brightest stars in the constellation Gemini and is actually a complex multiple-star system.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Alpha Geminorum canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T5573219 — 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: Alpha Geminorum Context triple: [Gemini, hasBayerDesignation, Alpha Geminorum]
-
A.
Alpha Telescopii
Alpha Telescopii is a blue-white giant star that serves as the primary luminary of the southern constellation Telescopium.
-
B.
Alpha Ophiuchi
Alpha Ophiuchi, traditionally known as Rasalhague, is the brightest star in the constellation Ophiuchus and a rapidly rotating A-type subgiant located relatively close to Earth.
-
C.
Canopus
Canopus was an ancient Egyptian coastal city near modern-day Alexandria, known as a major religious center and sanctuary dedicated to the goddess Isis.
-
D.
Alpha Doradus
Alpha Doradus is a bright blue-white binary star system in the southern constellation Dorado, notable as its most luminous member.
-
E.
Eta Canis Majoris
Eta Canis Majoris, also known as Aludra, is a luminous blue supergiant star in the constellation Canis Major and one of its brightest members.
- 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: Alpha Geminorum Target entity description: Alpha Geminorum, also known as Castor, is one of the brightest stars in the constellation Gemini and is actually a complex multiple-star system.
-
A.
Alpha Telescopii
Alpha Telescopii is a blue-white giant star that serves as the primary luminary of the southern constellation Telescopium.
-
B.
Alpha Ophiuchi
Alpha Ophiuchi, traditionally known as Rasalhague, is the brightest star in the constellation Ophiuchus and a rapidly rotating A-type subgiant located relatively close to Earth.
-
C.
Canopus
Canopus was an ancient Egyptian coastal city near modern-day Alexandria, known as a major religious center and sanctuary dedicated to the goddess Isis.
-
D.
Alpha Doradus
Alpha Doradus is a bright blue-white binary star system in the southern constellation Dorado, notable as its most luminous member.
-
E.
Eta Canis Majoris
Eta Canis Majoris, also known as Aludra, is a luminous blue supergiant star in the constellation Canis Major and one of its brightest members.
- F. None of above. chosen
Statements (41)
| Predicate | Object |
|---|---|
| instanceOf |
flare star
ⓘ
multiple star system ⓘ |
| alsoKnownAs |
Castor
NERFINISHED
ⓘ
YY Geminorum NERFINISHED ⓘ |
| apparentMagnitudeV | 1.58 ⓘ |
| bayerDesignation | α Geminorum NERFINISHED ⓘ |
| belongsToAsterism | Gemini constellation figure ⓘ |
| component |
Castor A
NERFINISHED
ⓘ
Castor Aa NERFINISHED ⓘ Castor Ab NERFINISHED ⓘ Castor B NERFINISHED ⓘ Castor Ba NERFINISHED ⓘ Castor Bb NERFINISHED ⓘ Castor C NERFINISHED ⓘ Castor Ca NERFINISHED ⓘ Castor Cb NERFINISHED ⓘ |
| constellation | Gemini NERFINISHED ⓘ |
| culturalAssociation | one of the twin stars of Gemini along with Pollux ⓘ |
| declination | +31° 53′ 18″ ⓘ |
| distanceFromEarth_ly | approximately 51 ⓘ |
| distanceFromEarth_pc | approximately 15.6 ⓘ |
| flamsteedDesignation | 66 Geminorum NERFINISHED ⓘ |
| hasVariableComponent | YY Geminorum NERFINISHED ⓘ |
| hemisphereVisibility | northern ⓘ |
| isOneOfBrightestInConstellation | true ⓘ |
| mass_relativeToSun | components range roughly 0.6–2.0 ⓘ |
| numberOfComponents | 6 ⓘ |
| orbitalRelationship |
Castor A and Castor B orbit common barycenter
ⓘ
Castor C orbits Castor AB pair NERFINISHED ⓘ |
| parallax_mas | about 66.9 ⓘ |
| properMotionDec_masPerYr | about −145 ⓘ |
| properMotionRA_masPerYr | about −191 ⓘ |
| radialVelocity_kmPerSec | about +1 ⓘ |
| rightAscension | 07h 34m 36s ⓘ |
| separationFromPollux_deg | about 4.5 ⓘ |
| spectralType |
A1V
ⓘ
A2V ⓘ M-type (for red dwarf components) ⓘ M-type dwarf ⓘ |
| systemConfiguration | hierarchical triple of spectroscopic binaries ⓘ |
| 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: Alpha Geminorum Description of subject: Alpha Geminorum, also known as Castor, is one of the brightest stars in the constellation Gemini and is actually a complex multiple-star system.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Castor