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.
Observed surface forms (3)
| Surface form | Occurrences |
|---|---|
| Beta Persei C | 0 |
| Beta Persei A | 0 |
| Beta Persei B | 0 |
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 ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.