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β¹ Sagittarii
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Sagittarius
Right ascension 19h 22m 38.3s
Declination -44° 27' 32"
Apparent magnitude (V) +3.96
Distance 378 ± 42 ly
(116 ± 13 pc)
Spectral type B9V
Other designations
Arkab Prior, HR 7337,
HD 181454, SAO 229646,
HIP 95241, CCDM 19226-4428

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.

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

β² Sagittarii
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Sagittarius
Right ascension 19h 23m 13.2s
Declination -44° 47' 59"
Apparent magnitude (V) +4.27
Distance 139 ± 5 ly
(43 ± 2 pc)
Spectral type F2III
Other designations
Arkab Posterior, HR 7343,
HD 181623, SAO 229654,
HIP 95294

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.

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