▁the ▁ σ ▁Or ion is ▁cluster ▁as ▁a ▁whole . ▁▁ σ ▁Or ion is ▁C ▁The ▁f ain test ▁member ▁of ▁the ▁main ▁ σ ▁Or ion is ▁stars ▁is ▁component ▁C . ▁ ▁It ▁is ▁also ▁the ▁closest ▁to ▁ σ ▁Ori ▁AB ▁at ▁ 1 1 ", ▁corresponding ▁to ▁ 3 , 9 6 0 ▁astronom ical ▁units . ▁ ▁It ▁is ▁an ▁A - type ▁main ▁sequence ▁star . ▁▁ σ ▁Ori ▁C ▁has ▁a ▁faint ▁companion ▁ 2 " ▁away , ▁referred ▁to ▁as ▁C b ▁and ▁M AD - 4 . ▁ ▁C b ▁is ▁five ▁magn itudes ▁f ain ter ▁than ▁ σ ▁Ori ▁Ca ▁at ▁inf ra red ▁w avel ength s , ▁K ▁band ▁magnitude ▁ 1 4 . 0 7 , ▁and ▁is ▁likely ▁to ▁be ▁a ▁brown ▁d war f . ▁▁ σ ▁Or ion is ▁D ▁Component ▁D ▁is ▁a ▁fairly ▁typical ▁B 2 ▁main ▁sequence ▁star ▁of ▁magnitude ▁ 6 . 6 2 . ▁ ▁It ▁is ▁ 1 3 " ▁from ▁ σ ▁Ori ▁AB , ▁corresponding ▁to ▁ 4 , 6 8 0 ▁A U . ▁ ▁Its ▁size , ▁temperature , ▁and ▁bright ness ▁are ▁very ▁similar ▁to ▁ σ ▁Ori ▁E ▁but ▁it ▁shows ▁none ▁of ▁the ▁unusual ▁spectral ▁features ▁or ▁vari ability ▁of ▁that ▁star . ▁▁ σ ▁Or ion is ▁E ▁Component ▁E ▁is ▁an ▁unusual ▁variable ▁star , ▁class ified ▁as ▁an ▁S X ▁Ari et is ▁variable ▁and ▁also ▁known ▁as