▁also ▁been ▁found ▁in ▁models ▁of ▁this ▁star . ▁The ▁spectrum ▁also ▁shows ▁variation , ▁leading ▁to ▁different ▁class ifications ▁being ▁given ▁for ▁the ▁star . ▁ ▁The ▁exact ▁properties ▁of ▁ 5 5 ▁C yg ni ▁are ▁not ▁known ▁precisely ▁and ▁are ▁also ▁variable . ▁ ▁It ▁is ▁a ▁hot ▁l umin ous ▁super gi ant ▁several ▁hundred ▁thousand ▁times ▁as ▁l umin ous ▁as ▁the ▁sun . ▁ ▁This ▁star ▁was ▁originally ▁a ▁standard ▁for ▁the ▁B 3 ▁I a ▁spectral ▁type . ▁ ▁The ▁type ▁of ▁p uls ations ▁that ▁ 5 5 ▁C yg ▁exhib its ▁suggest ▁that ▁it ▁was ▁previously ▁a ▁red ▁super gi ant ▁that ▁has ▁shed ▁its ▁outer ▁layers . ▁ ▁The ▁most ▁massive ▁red ▁super gi ants ▁are ▁expected ▁to ▁pass ▁through ▁a ▁blue ▁super gi ant ▁phase ▁before ▁becoming ▁a ▁Wolf - R ay et ▁star ▁and ▁eventually ▁expl oding ▁as ▁a ▁type ▁Ib ▁or ▁I c ▁super n ova . ▁ ▁References ▁ ▁Category : C yg n us ▁( const ell ation ) ▁Category : B - type ▁super gi ants ▁C yg ni , ▁ 5 5 ▁C yg ni , ▁V 1 6 6 1 ▁ 7 9 7 7 ▁ 1 9 8 4 7 8 ▁ 1 0 2 7 2 4 ▁B D + 4 5 ▁ 3 2 9 1 ▁Category : Alpha ▁C yg ni ▁variables <0x0A> </s> ▁The ▁ 2 0 1 4 ▁A FC ▁Challenge ▁Cup ▁Final ▁was ▁an ▁association ▁football ▁match ▁between