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Beta Sagittarii
The Bayer designation Beta Sagittarii (Beta Sgr, β Sagittarii, β Sgr) is shared by two star systems, β¹ Sagittarii and β² Sagittarii, in the constellation Sagittarius. The two stars are separated by 0.36° in the sky. Beta Sagittarii also has the traditional name Arkab.
==β¹ Sagittarii==
Beta¹ Sagittarii (Beta¹ Sgr, β¹ Sagittarii, β¹ Sgr), also called Arkab Prior since it leads β² across the sky, is a binary star lying 378 light years from Earth. Arkab Prior A is a spectral type B9 main sequence dwarf which has an apparent magnitude of +3.96. Arkab Prior B is a type A3 dwarf with an apparent magnitude of +7.4. The two stars are separated in the sky by 28 arcseconds, which puts them at least 3300 astronomical units apart.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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