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gptkbp:instanceOf
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gptkb:star
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gptkbp:age
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5.3–6.5 billion years
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gptkbp:alsoKnownAs
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gptkb:Alpha_Centauri
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gptkbp:apparentMagnitude
|
−0.27
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gptkbp:binarySystem
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gptkb:Alpha_Centauri_A_and_B
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gptkbp:catalogue
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gptkb:Gliese_Catalogue_of_Nearby_Stars
gptkb:Henry_Draper_Catalogue
gptkb:Hipparcos_Catalogue
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gptkbp:catalogueNumber
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gptkb:Gliese_559
gptkb:HR_5459
gptkb:HD_128620
gptkb:HIP_71683
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gptkbp:closestApproachToSun
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in about 27,000 years
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gptkbp:component
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gptkb:Proxima_Centauri
gptkb:Alpha_Centauri_A
gptkb:Alpha_Centauri_B
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gptkbp:declination
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−60° 50′ 02.3737″
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gptkbp:discoveredBy
|
unknown (known since antiquity)
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gptkbp:distanceFromEarth
|
4.37 light years
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gptkbp:hasExoplanet
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gptkb:Proxima_Centauri_b
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gptkbp:hasFlareStar
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gptkb:Proxima_Centauri
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gptkbp:hasHabitableZone
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gptkb:Alpha_Centauri_A
gptkb:Alpha_Centauri_B
|
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gptkbp:hasPlanetCandidate
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gptkb:Alpha_Centauri_Bb_(unconfirmed)
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|
https://www.w3.org/2000/01/rdf-schema#label
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Gliese 559
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gptkbp:isTripleSystem
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Alpha Centauri A, B, and Proxima Centauri
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gptkbp:locatedIn
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constellation Centaurus
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gptkbp:luminosity
|
Alpha Centauri A: 1.519 solar luminosities
Alpha Centauri B: 0.5002 solar luminosities
Proxima Centauri: 0.0017 solar luminosities
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gptkbp:mass
|
Alpha Centauri A: 1.1 solar masses
Alpha Centauri B: 0.907 solar masses
Proxima Centauri: 0.1221 solar masses
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gptkbp:metallicity
|
Alpha Centauri A: +0.22
Alpha Centauri B: +0.26
Proxima Centauri: −0.01
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gptkbp:nearestStarSystemToSun
|
true
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gptkbp:orbitType
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Alpha Centauri A and B: 79.91 years
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gptkbp:parallax
|
747.17 mas
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gptkbp:properMotionRA
|
−3678.19 mas/yr (RA), 481.84 mas/yr (Dec)
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gptkbp:radialVelocity
|
−22.4 km/s
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gptkbp:rightAscension
|
14h 39m 36.49400s
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gptkbp:separates
|
Alpha Centauri A and B: 23.6 AU (average)
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gptkbp:spectralType
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gptkb:G2V_(Alpha_Centauri_A)
gptkb:K1V_(Alpha_Centauri_B)
gptkb:M5.5Ve_(Proxima_Centauri)
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gptkbp:visibleToNakedEye
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gptkb:Southern_Hemisphere
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gptkbp:bfsParent
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gptkb:Alpha_Centauri
gptkb:Alpha_Centauri_system
gptkb:Alpha_Centauri_triple_star_system
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gptkbp:bfsLayer
|
6
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