Ko te wāhanga tino marama o te pūnaha, ko Sigma Scorpii Aa, he takirua spectroscopic takirua, e te tikanga e kore te rua kua whakatauhia mā te whakamahi i te telescope. Engari, kua whakaritea to ratou aorangi e huringa i roto i to ratou spectrum ngā meinga e te nekehanga Doppler. tohu tenei e oti te tokorua i te aorangi ia 33.01 ra, me te whai i te excentricity orbital o 0.32. te wāhanga matua o te takirua spectroscopic, ko Sigma Scorpii Aa1, ko te whetu nui tupu ki te whakarōpūtanga stellar o B1 III. Ko reira e pā ana ki 18 nga wa te papatipu o te ra, me te 12 wa te radius o te ra. whetu e radiating e pā ana ki 29000 nga wa te luminosity o te ra i tona envelope waho i te pāmahana o 26150 K. Ko tenei whetu he whetu rerekē o te momo Beta Cephei, meinga ia huringa i roto i to ratou spectrum ngā meinga e te nekehanga Doppler.
He whetū rerekē tēnei o te momo Beta Cephei