Tags: Star.
Sigma Boötis (σ Boo σ Boötis) is a star in the constellation Boötes.Sigma Boötis is a yellow-white F-type main sequence dwarf with an apparent magnitude of +4.47. It is approximately 50.4 light years from Earth.In Chinese 梗河 (Gěng Hé) meaning Celestial Lance refers to an asterism consisting of σ Boötis ε Boötis and ρ Boötis.