▁magnitude ▁ 1 ▁star ▁is ▁exactly ▁ 1 0 0 ▁times ▁br ighter ▁than ▁a ▁magnitude ▁ 6 ▁star . ▁The ▁br ighter ▁an ▁object ▁appears , ▁the ▁lower ▁the ▁value ▁of ▁its ▁magnitude , ▁with ▁the ▁bright est ▁objects ▁reaching ▁negative ▁values . ▁ ▁Astronom ers ▁use ▁two ▁different ▁definitions ▁of ▁magnitude : ▁apparent ▁magnitude ▁and ▁absolute ▁magnitude . ▁The ▁apparent ▁magnitude ▁() ▁is ▁the ▁bright ness ▁of ▁an ▁object ▁as ▁it ▁appears ▁in ▁the ▁night ▁sky ▁from ▁Earth . ▁ ▁Appar ent ▁magnitude ▁depends ▁on ▁an ▁object ' s ▁intr insic ▁lum inos ity , ▁its ▁distance , ▁and ▁the ▁ext inction ▁reducing ▁its ▁bright ness . ▁The ▁absolute ▁magnitude ▁() ▁describes ▁the ▁intr insic ▁lum inos ity ▁em itted ▁by ▁an ▁object ▁and ▁is ▁defined ▁to ▁be ▁equal ▁to ▁the ▁apparent ▁magnitude ▁that ▁the ▁object ▁would ▁have ▁if ▁it ▁were ▁placed ▁at ▁a ▁certain ▁distance ▁from ▁Earth , ▁ 1 0 ▁parse cs ▁for ▁stars . ▁A ▁more ▁complex ▁definition ▁of ▁absolute ▁magnitude ▁is ▁used ▁for ▁plan ets ▁and ▁small ▁Sol ar ▁System ▁bodies , ▁based ▁on ▁its ▁bright ness ▁at ▁one ▁astronom ical ▁unit ▁from ▁the ▁observer ▁and ▁the ▁Sun . ▁ ▁The ▁Sun ▁has ▁an ▁apparent ▁magnitude ▁of ▁− 2 7 ▁and ▁Si ri us , ▁the ▁bright est ▁visible ▁star ▁in ▁the ▁night ▁sky , ▁− 1 . 4 6 . ▁Appar ent ▁magn itudes ▁can ▁also ▁be ▁assigned ▁to ▁artificial ▁objects ▁in ▁Earth ▁orbit ▁with ▁the ▁International ▁Space ▁Station ▁( I SS ) ▁sometimes ▁reaching ▁a