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.
Observed surface forms (3)
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
NERFINISHED
ⓘ
Demon Star NERFINISHED ⓘ β Persei NERFINISHED ⓘ |
| hasApparentMagnitudeAtMaximum | about 2.1 ⓘ |
| hasApparentMagnitudeAtMinimum | about 3.4 ⓘ |
| hasApparentMagnitudeRange | 2.1 to 3.4 ⓘ |
| hasBayerDesignation | β Persei NERFINISHED ⓘ |
| hasComponent |
Algol A
NERFINISHED
ⓘ
Algol B NERFINISHED ⓘ Algol C NERFINISHED ⓘ |
| hasCulturalAssociation | traditionally associated with a demon or ghoul in Arabic astronomy ⓘ |
| hasDeclination | +40° 57′ 20″ ⓘ |
| hasDiscoveryAsVariableStarBy | Gemini astronomer John Goodricke NERFINISHED ⓘ |
| hasDistanceFromEarth |
about 28 parsecs
ⓘ
about 90 light-years ⓘ |
| hasEccentricity | approximately 0 (nearly circular orbit) ⓘ |
| hasFlamsteedDesignation | 26 Persei NERFINISHED ⓘ |
| 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 NERFINISHED ⓘ |
| hasVariableType | EA (Algol-type eclipsing binary) ⓘ |
| isOneOfBestStudiedVariableStars | true ⓘ |
| isPrototypeOf | Algol-type eclipsing binaries ⓘ |
| locatedInConstellation | Perseus NERFINISHED ⓘ |
| nameOrigin | derived from Arabic "raʾs al-ghūl" meaning "head of the demon" ⓘ |
| wasIdentifiedAsEclipsingBinaryInYear | 1783 ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.