variable star Algol
E554036
Variable star Algol is a famous eclipsing binary system in the constellation Perseus whose periodic dimming made it one of the first known variable stars.
Observed surface forms (5)
| Surface form | Occurrences |
|---|---|
| Algol | 0 |
| Algol A | 0 |
| Algol B | 0 |
| Algol C | 0 |
| Algol star system | 1 |
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
eclipsing binary star system
ⓘ
main-sequence star ⓘ spectroscopic binary ⓘ subgiant star ⓘ variable star ⓘ |
| apparentMagnitudeAtMaximum | 2.1 ⓘ |
| apparentMagnitudeAtMinimum | 3.4 ⓘ |
| apparentMagnitudeRange | 2.1–3.4 ⓘ |
| catalogIdentifier |
BD+40 673
NERFINISHED
ⓘ
HD 19356 NERFINISHED ⓘ HIP 14576 NERFINISHED ⓘ HR 936 NERFINISHED ⓘ |
| component |
Algol A
NERFINISHED
ⓘ
Algol B NERFINISHED ⓘ Algol C NERFINISHED ⓘ |
| constellation | Perseus NERFINISHED ⓘ |
| declination | +40° 57′ 20″ ⓘ |
| discovererOfVariability | Gemini astronomer Geminiano Montanari NERFINISHED ⓘ |
| distanceFromEarth |
about 28 parsecs
ⓘ
about 90 light-years ⓘ |
| hasCulturalAssociation |
Medusa’s head in Greek mythology
NERFINISHED
ⓘ
considered an unlucky or demon star in historical astrology ⓘ |
| lightCurveFeature |
primary eclipse causes major dimming
ⓘ
secondary eclipse causes minor dimming ⓘ |
| mass |
about 0.8 solar masses
ⓘ
about 1.7 solar masses ⓘ about 3.4 solar masses ⓘ |
| massTransfer | occurs from Algol B to Algol A ⓘ |
| orbitalPeriodOfInnerBinary | about 2.867 days ⓘ |
| orbitalPeriodOfOuterComponent | about 1.86 years ⓘ |
| otherName |
Beta Persei
NERFINISHED
ⓘ
Demon Star NERFINISHED ⓘ β Persei NERFINISHED ⓘ |
| period | about 2.867 days ⓘ |
| phenomenon | Algol paradox ⓘ |
| primaryEclipseDuration | about 10 hours ⓘ |
| radius |
about 2.9 solar radii
ⓘ
about 3.5 solar radii ⓘ |
| rightAscension | 03h 08m 10.1s ⓘ |
| spectralType |
A7 V
ⓘ
B8 V ⓘ K2 IV ⓘ |
| variabilityRecognizedIn | 17th century ⓘ |
| variableStarDesignation | Beta Persei NERFINISHED ⓘ |
| variableType | EA (Algol-type eclipsing binary) ⓘ |
| wasOneOfFirstKnown |
eclipsing binaries
ⓘ
periodic variable stars ⓘ |
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Algol star system