BETA SAGITTARII

(Redirected from Beta1 Sagittarii)

The Bayer designation 'Beta Sagittarii' (β Sgr / β Sagittarii) is shared by two star systems, 'β¹ Sagittarii' and 'β² Sagittarii', in the constellation Sagittarius. The two stars are separated by 0.36° on the sky. Beta Sagittarii also has the traditional name 'Arkab', from the Arabic عرقوب ''^carqūb'' meaning ''hamstring''.

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β¹ Sagittarii

β² Sagittarii

β¹ Sagittarii

'Beta-1 Sagittarii', 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 have a separation on the sky of 28 arcseconds, which puts them at least 3300 Astronomical Units apart.

β² Sagittarii

'Beta-2 Sagittarii', also called 'Arkab Posterior' since it trails β¹ across the sky, is a spectral type F2 giant which has an apparent magnitude of +4.27. It is 137 light years from Earth.