半人馬座ξ2 半人馬座Xi ξ Cen ξ Centauri是在南天半人馬座的三星系統這較寬的光學雙星視星等為裸眼可見的等略比半人馬座ξA型主序星暗等年週視差mas距離太陽大約光年在這樣的距離恆星會因為中間的星際塵埃造成消光而使視星等減弱等 已隱藏部分未翻譯内容歡迎參與翻譯 This system was discovered to be a singlelined spectroscopic binary in  by American astronomer Joseph Haines Moore The pair component A orbit each other with a period of  days and an eccentricity of  The primary is a Btype star with a stellar classification of B V or B IV depending on the source This indicates it may be a main sequence star or a more evolved subgiant star It has about  times the mass of the Sun and radiates  times the solar luminosity from its outer atmosphere at an effective temperature of  K It is a hybrid pulsator and shows spacings in both g and p modes A third star component B is a magnitude  Ftype main sequence star with a classification of F V It has  times the mass of the Sun and radiates  times the solar luminosity at an effective temperature of  K It lies at an angular separation of  arc seconds from the inner pair They share a common proper motion indicating they may be gravitationally bound with an orbital period of around  years The system has a peculiar velocity of  kms It belongs to the ScorpiusCentaurus association and appears to be a member of the Goulds Belt