▁Her tha ▁bright ness ▁indicating ▁a ▁variation ▁of ▁half ▁a ▁magnitude ▁and ▁a ▁short ▁period . ▁ ▁In ▁October ▁ 1 9 9 2 ▁D otto ▁et ▁al . ▁performed ▁ 2 0 ▁hours ▁of ▁observations ▁spread ▁over ▁ 6 ▁night s ▁to ▁investigate ▁Her tha ▁rot ational ▁period , ▁approximate ▁shape , ▁and ▁the ▁coordinates ▁of ▁its ▁rot ational ▁axis . ▁ ▁They ▁were ▁able ▁to ▁confirm ▁a ▁rot ational ▁period ▁of ▁ 8 . 3 9 8 ▁ ± ▁. 0 0 1 ▁hours ▁as ▁previously ▁measured ▁by ▁Harris ▁et ▁al . ▁published ▁earlier ▁in ▁ 1 9 9 2 . ▁ ▁In ▁the ▁same ▁study , ▁D otto ▁et ▁al . ▁measured ▁the ▁astero id ' s ▁shape ▁and ▁rot ational ▁axis . ▁ ▁The ▁axes ' ▁r ati os ▁were ▁found ▁to ▁be : ▁a / b ▁= ▁ 1 . 3 4 ▁ ± ▁. 0 3 ▁and ▁b / c ▁= ▁ 1 . 2 2 ▁ ± ▁. 0 5 . ▁ ▁Two ▁possible ▁values ▁were ▁determined ▁for ▁the ▁rot ational ▁axis , ▁however ▁further ▁measurements ▁at ▁different ▁e cli ptic ▁long itudes ▁are ▁required ▁to ▁determine ▁which ▁is ▁correct . ▁ ▁In ▁August ▁ 2 0 0 3 ▁Tor ppa ▁et ▁al . ▁published ▁their ▁results ▁on ▁the ▁shape ▁and ▁rot ational ▁properties ▁of ▁a ▁number ▁of ▁astero ids , ▁including ▁Her tha . ▁ ▁Util izing ▁data ▁from ▁ 4 2 ▁light cur ves ▁of ▁Her tha ▁sp anning ▁from ▁ 1 9 7