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gptkbp:instanceOf
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gptkb:star
eclipsing binary star
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gptkbp:age
|
about 570 million years
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gptkbp:apparentMagnitude
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2.12
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gptkbp:catalogueNumber
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gptkb:ADS_2362
gptkb:BD+40_673
gptkb:HD_19356
gptkb:HIP_14576
gptkb:HR_936
gptkb:SAO_38592
gptkb:FK5_111
gptkb:WDS_J03082+4057
GC 3737
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gptkbp:component
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gptkb:Algol_A
gptkb:Algol_B
gptkb:Algol_C
Algol A: B8V main sequence
Algol B: K0IV subgiant
Algol C: A7m main sequence
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gptkbp:culturalSignificance
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associated with misfortune in ancient cultures
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gptkbp:declination
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+40° 57′ 20.3280″
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gptkbp:diameter
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Algol A: 2.73 solar radii
Algol B: 3.48 solar radii
Algol C: 1.73 solar radii
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gptkbp:discoveredBy
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gptkb:John_Goodricke
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gptkbp:discoveredIn
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1782
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gptkbp:distanceFromEarth
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about 90 light-years
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gptkbp:eccentricity
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0.0 (circular orbit for A-B pair)
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gptkbp:hasExoplanet
|
no
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|
https://www.w3.org/2000/01/rdf-schema#label
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Algol (Beta Persei)
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gptkbp:inclination
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81°
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gptkbp:locatedIn
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gptkb:constellation_Perseus
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gptkbp:luminosity
|
Algol A: 98 L☉
Algol B: 4.5 L☉
Algol C: 10 L☉
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gptkbp:mass
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Algol A: 3.17 solar masses
Algol B: 0.70 solar masses
Algol C: 1.76 solar masses
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gptkbp:metallicity
|
[Fe/H] = -0.15
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gptkbp:nameOrigin
|
from Arabic 'al-ghūl', meaning 'the ghoul' or 'demon'
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gptkbp:notableFor
|
first known eclipsing binary
prototype of Algol variable stars
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gptkbp:orbitalSeparation
|
0.062 AU (A-B pair)
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gptkbp:otherName
|
gptkb:Beta_Persei
Demon Star
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gptkbp:parallax
|
35.4371 mas
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gptkbp:period
|
2.867 days
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gptkbp:rightAscension
|
03h 08m 10.13299s
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gptkbp:spectralType
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B8V + K0IV + A7m
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gptkbp:variabilityRange
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magnitude 2.1 to 3.4
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gptkbp:variableType
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gptkb:Algol_variable
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gptkbp:visibleToNakedEye
|
yes
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gptkbp:bfsParent
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gptkb:Algol_A
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gptkbp:bfsLayer
|
7
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