Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Bayer designation Beta Sagittarii is shared by two star systems, ¹ Sagittarii and ² Sagittarii, in the constellation Sagittarius. Beta-1 Sagittarii, also called Arkab Prior since it leads ² 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.