2 . 0 – 2 . 5   AU ▁once ▁every ▁ 3 ▁years ▁and ▁ 5 ▁months ▁( 1 , 2 4 2 ▁days ; ▁semi - major ▁axis ▁of ▁ 2 . 2 6   AU ). ▁Its ▁orbit ▁has ▁an ▁ecc ent ric ity ▁of ▁ 0 . 1 0 ▁and ▁an ▁incl ination ▁of ▁ 6 ° ▁with ▁respect ▁to ▁the ▁e cli ptic . ▁The ▁body ' s ▁observation ▁arc ▁begins ▁with ▁its ▁official ▁discovery ▁observation ▁at ▁Tur ku . ▁ ▁Phys ical ▁characteristics ▁▁ ▁N urm ela ▁is ▁an ▁assumed ▁carbon ace ous ▁C - type ▁astero id , ▁while ▁its ▁al bed o ▁and ▁membership ▁to ▁the ▁Bapt ist ina ▁family ▁is ▁indic ative ▁for ▁an ▁X - type . ▁ ▁Rot ation ▁period ▁▁ ▁In ▁March ▁and ▁April ▁ 2 0 0 7 , ▁two ▁rot ational ▁light cur ves ▁of ▁N urm ela ▁was ▁obtained ▁from ▁phot ometric ▁observations ▁by ▁Adri án ▁Gal ád ▁and ▁Robert ▁Steph ens . ▁They ▁gave ▁an ▁identical ▁rotation ▁period ▁of ▁ 3 . 1 5 8 7 ▁hours ▁with ▁a ▁bright ness ▁variation ▁of ▁ 0 . 3 3 ▁and ▁ 0 . 4 2 ▁magnitude , ▁respectively ▁( ). ▁In ▁April ▁ 2 0 1 7 , ▁another ▁observation ▁by ▁Steph ens ▁gave ▁a ▁conc urr ing ▁period ▁of ▁ 3 . 1 5 9 ▁hours ▁() ▁with ▁an ▁amplitude ▁of ▁ 0 . 5 8 ▁magnitude , ▁indic ative ▁for ▁an ▁el ong ated ▁shape .