8 ▁to ▁ 2 0 0 2 , ▁a ▁more ▁ref ined ▁set ▁of ▁axes ' ▁r ati os ▁was ▁obtained ▁and ▁a ▁detailed ▁shape ▁model ▁was ▁obtained ▁through ▁in version . ▁ ▁New ▁values ▁for ▁the ▁axes ' ▁r ati os ▁are : ▁a / b ▁= ▁ 1 . 1 ▁and ▁b / c ▁= ▁ 1 . 5 . ▁ ▁Me asure ments ▁of ▁the ▁pole ▁direction ▁were ▁also ▁obtained , ▁however ▁like ▁D otto ▁et ▁al . ▁they ▁were ▁unable ▁to ▁differenti ate ▁between ▁their ▁two ▁possible ▁solutions ▁of ▁( β = + 5 8 ° , ▁ λ = 9 6 ° ) ▁and ▁( β = + 5 3 ° , ▁ λ = 2 7 4 ° ). ▁ ▁In ▁ 2 0 1 7 , ▁Han u š ▁et ▁al . ▁confirmed ▁that ▁the ▁correct ▁solution ▁is ▁ β = ° , ▁ λ = ° . ▁They ▁also ▁calculated ▁the ▁first ▁non - con vex ▁shape ▁model , ▁based ▁on ▁light cur ve ▁and ▁stell ar ▁occ ult ation ▁data . ▁ ▁Spect ral ▁classification ▁ ▁Although ▁Her tha ▁has ▁long ▁been ▁class ified ▁as ▁an ▁M - type ▁astero id ▁based ▁on ▁its ▁spectral ▁properties , ▁observations ▁carried ▁out ▁by ▁Riv kin ▁et ▁al . ▁in ▁ 1 9 9 6 ▁using ▁the ▁IR TF ▁at ▁Ma una ▁Ke a ▁Observ atory ▁have ▁raised ▁the ▁possibility ▁of ▁rec lass ification . ▁ ▁The ▁presence ▁of ▁a ▁dip ▁in ▁the ▁observed ▁spectrum ▁at ▁