Beta Persei
E554031
A-type main-sequence star
B-type main-sequence star
K-type subgiant star
eclipsing binary star system
variable star
Beta Persei, better known as Algol, is a famous eclipsing binary star system whose periodic dimming made it one of the first variable stars recognized in the night sky.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Beta Persei canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T5911114 — 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: Beta Persei Context triple: [Perseus constellation, contains, Beta Persei]
-
A.
ζ Persei
ζ Persei is a bright, massive B-type star in the constellation Perseus, notable as a prominent member of the Perseus OB2 stellar association.
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B.
Beta Geminorum
Beta Geminorum, also known as Pollux, is the brightest star in the constellation Gemini and an orange giant located relatively close to Earth.
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C.
Beta Tucanae
Beta Tucanae is a multiple star system in the southern constellation Tucana, visible to the naked eye and notable for its bright, closely spaced stellar components.
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D.
ξ Persei
ξ Persei is a hot, massive O-type star in the constellation Perseus, known as a bright runaway star with strong stellar winds.
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E.
Beta Capricorni
Beta Capricorni is a bright multiple star system in the constellation Capricornus, visible to the naked eye and often used as a reference point in the southern sky.
- 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: Beta Persei Target entity description: Beta Persei, better known as Algol, is a famous eclipsing binary star system whose periodic dimming made it one of the first variable stars recognized in the night sky.
-
A.
ζ Persei
ζ Persei is a bright, massive B-type star in the constellation Perseus, notable as a prominent member of the Perseus OB2 stellar association.
-
B.
Beta Geminorum
Beta Geminorum, also known as Pollux, is the brightest star in the constellation Gemini and an orange giant located relatively close to Earth.
-
C.
Beta Tucanae
Beta Tucanae is a multiple star system in the southern constellation Tucana, visible to the naked eye and notable for its bright, closely spaced stellar components.
-
D.
ξ Persei
ξ Persei is a hot, massive O-type star in the constellation Perseus, known as a bright runaway star with strong stellar winds.
-
E.
Beta Capricorni
Beta Capricorni is a bright multiple star system in the constellation Capricornus, visible to the naked eye and often used as a reference point in the southern sky.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
A-type main-sequence star
ⓘ
B-type main-sequence star ⓘ K-type subgiant star ⓘ eclipsing binary star system ⓘ variable star ⓘ |
| hasAlternativeName |
Algol
NERFINISHED
ⓘ
Beta Per NERFINISHED ⓘ Demon Star NERFINISHED ⓘ Gorgona NERFINISHED ⓘ β Persei NERFINISHED ⓘ |
| hasApparentMagnitudeAtMaximum | 2.1 ⓘ |
| hasApparentMagnitudeAtMinimum | 3.4 ⓘ |
| hasApparentMagnitudeRange | 2.1–3.4 ⓘ |
| hasBayerDesignation | β Persei NERFINISHED ⓘ |
| hasComponent |
Beta Persei A
NERFINISHED
ⓘ
Beta Persei B NERFINISHED ⓘ Beta Persei C NERFINISHED ⓘ |
| hasDeclination | +40° 57′ 20″ ⓘ |
| hasDistanceFromEarth |
about 28 parsecs
ⓘ
about 90 light-years ⓘ |
| hasEpoch | J2000.0 ⓘ |
| hasFlamsteedDesignation | 26 Persei ⓘ |
| hasHDDesignation | HD 19356 NERFINISHED ⓘ |
| hasHIPDesignation | HIP 14576 NERFINISHED ⓘ |
| hasHRDesignation | HR 936 NERFINISHED ⓘ |
| hasLuminosityOfPrimary | about 100 times solar luminosity ⓘ |
| hasLuminosityOfSecondary | about 4 times solar luminosity ⓘ |
| hasMassOfPrimary | about 3.6 solar masses ⓘ |
| hasMassOfSecondary | about 0.8 solar masses ⓘ |
| hasMassOfTertiary | about 1.7 solar masses ⓘ |
| hasNameEtymology | from Arabic al-ghūl meaning ‘the ghoul’ or ‘demon’ ⓘ |
| hasOrbitalInclination | about 82.5 degrees ⓘ |
| hasOrbitalPeriod | 2.867 days ⓘ |
| hasParallax | 35.14 mas ⓘ |
| hasProperMotionInDec | −1.43 mas/yr ⓘ |
| hasProperMotionInRA | +2.39 mas/yr ⓘ |
| hasRadialVelocity | +4.0 km/s ⓘ |
| hasRadiusOfPrimary | about 2.9 solar radii ⓘ |
| hasRadiusOfSecondary | about 3.5 solar radii ⓘ |
| hasRightAscension | 03h 08m 10.1s ⓘ |
| hasSAODesignation | SAO 38592 NERFINISHED ⓘ |
| hasSpectralType | A7m ⓘ |
| hasSpectralTypeOfPrimary | B8V ⓘ |
| hasSpectralTypeOfSecondary | K2IV ⓘ |
| hasTraditionalNameOrigin | Arabic ⓘ |
| hasVariableType | Algol-type eclipsing binary ⓘ |
| isKnownSinceAntiquity | true ⓘ |
| locatedInConstellation | Perseus NERFINISHED ⓘ |
| wasOneOfFirstKnownVariableStars | 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: Beta Persei Description of subject: Beta Persei, better known as Algol, is a famous eclipsing binary star system whose periodic dimming made it one of the first variable stars recognized in the night sky.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.