Algol
E554030
Beta Lyrae-type eclipsing binary
eclipsing binary star system
main-sequence star
spectroscopic binary
subgiant star
variable star
Algol is a famous eclipsing binary star system known for its regular brightness variations and is one of the best-studied variable stars in the night sky.
All labels observed (3)
How this entity was disambiguated
This entity first appeared as the object of triple T5911113 — 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: Algol Context triple: [Perseus constellation, contains, Algol]
-
A.
Algol family
The Algol family is a group of closely related imperative programming languages that pioneered block structure and influenced many later languages such as Pascal, C, and Java.
-
B.
Epsilon Scuti
Epsilon Scuti is a relatively faint star located in the small southern constellation Scutum.
-
C.
Zeta Tucanae
Zeta Tucanae is a main-sequence F-type star located in the southern constellation Tucana, visible to the naked eye from dark-sky locations.
-
D.
Beta Scuti
Beta Scuti is a prominent giant star in the constellation Scutum, notable as one of its brightest members.
-
E.
Alpha Scuti
Alpha Scuti is a relatively bright giant star in the constellation Scutum, visible to the naked eye from Earth.
- 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: Algol Target entity description: Algol is a famous eclipsing binary star system known for its regular brightness variations and is one of the best-studied variable stars in the night sky.
-
A.
Algol family
The Algol family is a group of closely related imperative programming languages that pioneered block structure and influenced many later languages such as Pascal, C, and Java.
-
B.
Epsilon Scuti
Epsilon Scuti is a relatively faint star located in the small southern constellation Scutum.
-
C.
Zeta Tucanae
Zeta Tucanae is a main-sequence F-type star located in the southern constellation Tucana, visible to the naked eye from dark-sky locations.
-
D.
Beta Scuti
Beta Scuti is a prominent giant star in the constellation Scutum, notable as one of its brightest members.
-
E.
Alpha Scuti
Alpha Scuti is a relatively bright giant star in the constellation Scutum, visible to the naked eye from Earth.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
Beta Lyrae-type eclipsing binary
ⓘ
eclipsing binary star system ⓘ main-sequence star ⓘ spectroscopic binary ⓘ subgiant star ⓘ variable star ⓘ |
| alsoKnownAs |
Beta Persei
ⓘ
Demon Star ⓘ β Persei ⓘ
linked to:
Beta Persei
|
| hasApparentMagnitudeAtMaximum | about 2.1 ⓘ |
| hasApparentMagnitudeAtMinimum | about 3.4 ⓘ |
| hasApparentMagnitudeRange | 2.1 to 3.4 ⓘ |
| hasBayerDesignation |
β Persei
ⓘ
linked to:
Beta Persei
|
| hasComponent |
Algol A
ⓘ
linked to:
Algol
Algol B ⓘ
linked to:
Algol
Algol C ⓘ |
| hasCulturalAssociation | traditionally associated with a demon or ghoul in Arabic astronomy ⓘ |
| hasDeclination | +40° 57′ 20″ ⓘ |
| hasDiscoveryAsVariableStarBy | Gemini astronomer John Goodricke ⓘ |
| hasDistanceFromEarth |
about 28 parsecs
ⓘ
about 90 light-years ⓘ |
| hasEccentricity | approximately 0 (nearly circular orbit) ⓘ |
| hasFlamsteedDesignation |
26 Persei
ⓘ
linked to:
Beta Persei
|
| hasInclination | about 81 degrees ⓘ |
| hasLightCurve | characteristic flat maxima with sharp eclipses ⓘ |
| hasLuminosityOfPrimary | about 100 times solar luminosity ⓘ |
| hasLuminosityOfSecondary | about 4 times solar luminosity ⓘ |
| hasMassOfPrimary | about 3.2 solar masses ⓘ |
| hasMassOfSecondary | about 0.8 solar masses ⓘ |
| hasOrbitalPeriod | about 2.867 days ⓘ |
| hasParallax | about 35.0 milliarcseconds ⓘ |
| hasPrimaryEclipseDuration | about 10 hours ⓘ |
| hasRadiusOfPrimary | about 2.9 solar radii ⓘ |
| hasRadiusOfSecondary | about 3.5 solar radii ⓘ |
| hasRightAscension | 03h 08m 10.1s ⓘ |
| hasSpectralType |
A7m
ⓘ
A7m for Algol C ⓘ B8V ⓘ B8V for Algol A ⓘ K2IV ⓘ K2IV for Algol B ⓘ |
| hasVariabilityPeriod | about 2.867 days ⓘ |
| hasVariableStarDesignation | Beta Persei ⓘ |
| hasVariableType | EA (Algol-type eclipsing binary) ⓘ |
| isOneOfBestStudiedVariableStars | true ⓘ |
| isPrototypeOf | Algol-type eclipsing binaries ⓘ |
| locatedInConstellation | Perseus ⓘ |
| nameOrigin | derived from Arabic "raʾs al-ghūl" meaning "head of the demon" ⓘ |
| wasIdentifiedAsEclipsingBinaryInYear | 1783 ⓘ |
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: Algol Description of subject: Algol is a famous eclipsing binary star system known for its regular brightness variations and is one of the best-studied variable stars in the night sky.
Referenced by (7)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Algol
linked to: Algol