▁It ▁is ▁radi ating ▁ 5 , 0 0 0 ▁times ▁the ▁lum inos ity ▁of ▁the ▁Sun ▁from ▁its ▁outer ▁atmosphere ▁at ▁an ▁effective ▁temperature ▁of ▁ 6 , 3 5 0   K , ▁which ▁creates ▁the ▁yellow - white ▁g low ▁of ▁an ▁F - type ▁star . ▁In ▁the ▁H ert z spr ung – Russ ell ▁diagram , ▁Al pha ▁Per se i ▁lies ▁inside ▁the ▁region ▁in ▁which ▁C ep heid ▁variables ▁are ▁found . ▁It ▁is ▁thus ▁useful ▁in ▁the ▁study ▁of ▁these ▁stars , ▁which ▁are ▁important ▁standard ▁cand les . ▁ ▁Un conf ir med ▁ex op lan et ▁▁ ▁In ▁ 2 0 1 0 ▁evidence ▁was ▁presented ▁of ▁a ▁planet ▁orbit ing ▁Mir f ak . ▁Rad ial ▁velocity ▁data ▁from ▁repeated ▁observations ▁of ▁the ▁star ▁found ▁a ▁periodic ▁variation ▁with ▁an ▁amplitude ▁of ▁ 7 0 . 8 ▁ ± ▁ 1 . 6 ▁m / s . ▁The ▁proposed ▁planet ▁is ▁estimated ▁to ▁have ▁a ▁minimum ▁mass ▁of ▁approximately ▁ 6 . 6 ▁times ▁that ▁of ▁Jup iter ▁and ▁an ▁orb ital ▁period ▁of ▁ 1 2 8 ▁days , ▁but ▁the ▁claimed ▁period ▁may ▁not ▁be ▁stable ▁over ▁ 2 0 ▁years ▁so ▁the ▁ex op lan et ▁is ▁considered ▁doubt ful . ▁Rot ational ▁mod ulation ▁due ▁to ▁surface ▁activity ▁such ▁as ▁star sp ots ▁seem ▁a ▁more ▁likely ▁explanation ▁of ▁the ▁radial ▁velocity ▁variations . ▁ ▁In ▁previous ▁publications , ▁periodic ▁radial ▁velocity ▁variations ▁of ▁ 8