Beta Sagittarii (β Sagittarii, abbreviated Beta Sgr, β Sgr) is the common designation shared by two star systems in the constellation of Sagittarius, themselves designated β1 Sagittarii (itself a probable binary star) and β2 Sagittarii. The two systems are separated by 0.36° in the sky.
β1 Sagittarii's two components are designated β1 Sagittarii A, also named Arkab Prior,[1] and β1 Sagittarii B (sometimes designated Arkab Prior A and B). β2 Sagittarii is named Arkab Posterior.[1] Beta Sagittarii is also referred to by the traditional name Arkab.