Alpha Centauri triple star system

GPTKB entity

Predicate	Object
gptkbp:instanceOf	gptkb:star
gptkbp:age	5.3–6.5 billion years
gptkbp:alsoKnownAs	gptkb:Rigil_Kentaurus gptkb:Toliman
gptkbp:apparentMagnitude	-0.27
gptkbp:brightestStar	gptkb:Alpha_Centauri_A gptkb:Alpha_Centauri_B
gptkbp:catalogueNumber	gptkb:Gliese_559 gptkb:HD_128620_(A) gptkb:HD_128621_(B) gptkb:HR_5459 HD 128620/1/2
gptkbp:component	gptkb:Proxima_Centauri gptkb:Alpha_Centauri_A gptkb:Alpha_Centauri_B
gptkbp:declination	-60° 50′ 02.3737″
gptkbp:discoveredBy	unknown (known since antiquity)
gptkbp:distanceFromEarth	4.37 light-years
gptkbp:hasExoplanet	gptkb:Proxima_Centauri_b
gptkbp:hasViewOf	gptkb:Southern_Hemisphere
https://www.w3.org/2000/01/rdf-schema#label	Alpha Centauri triple star system
gptkbp:locatedIn	constellation Centaurus
gptkbp:mass	2.18 solar masses (A+B)
gptkbp:metallicity	[Fe/H] = +0.22 (A) [Fe/H] = +0.26 (B)
gptkbp:nearestStarSystemToSun	true
gptkbp:nearestStarToSun	gptkb:Proxima_Centauri
gptkbp:notableFor	closest star system to the Solar System
gptkbp:orbitalPeriod_(A_and_B)	79.91 years
gptkbp:parallax	747.17 mas
gptkbp:ProximaDistanceFromAB	~13,000 AU
gptkbp:rightAscension	14h 39m 36.49400s
gptkbp:separation_(A_and_B)	11.2 AU (average)
gptkbp:spectralType	gptkb:G2V_(Alpha_Centauri_A) gptkb:K1V_(Alpha_Centauri_B) gptkb:M5.5Ve_(Proxima_Centauri)
gptkbp:bfsParent	gptkb:Proxima_Centauri gptkb:Centaurus
gptkbp:bfsLayer	5