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Sagittarius β ¹, or Tianyuan II[1], is abinary star , 378 light-years from the Earth.Sagittarius β ¹ A is a main sequence band dwarf with spectral type B9, and its apparent magnitude is+3.96.Sagittarius β ¹ B is an A3 dwarf star with an apparent magnitude of+7.4.The distance between the two stars in the air is 28 angular seconds, and the actual distance is 3300AU。[2]
