▁resolution ▁of ▁HE FT ▁is ▁c . ▁ 1 . 5 '. ▁R ather ▁than ▁using ▁a ▁gra zing - angle ▁X - ray ▁teles cope , ▁HE FT ▁makes ▁use ▁of ▁a ▁novel ▁t ung sten - sil icon ▁mult il ayer ▁coat ings ▁to ▁extend ▁the ▁reflect ivity ▁of ▁nested ▁gra zing - inc idence ▁mirror s ▁beyond ▁ 1 0 ▁ke V . ▁HE FT ▁has ▁an ▁energy ▁resolution ▁of ▁ 1 . 0 ▁ke V ▁full ▁width ▁at ▁half ▁maximum ▁at ▁ 6 0 ▁ke V . ▁HE FT ▁was ▁launched ▁for ▁a ▁ 2 5 - hour ▁bal lo on ▁flight ▁in ▁May ▁ 2 0 0 5 . ▁The ▁instrument ▁performed ▁within ▁specification ▁and ▁observed ▁T au ▁X - 1 , ▁the ▁C rab ▁Neb ula . ▁ ▁High - resol ution ▁g amma - ray ▁and ▁hard ▁X - ray ▁spect rom eter ▁( HI RE GS ) ▁A ▁bal lo on - bor ne ▁experiment ▁called ▁the ▁High - resol ution ▁g amma - ray ▁and ▁hard ▁X - ray ▁spect rom eter ▁( HI RE GS ) ▁observed ▁X - ray ▁and ▁g amma - ray s ▁em issions ▁from ▁the ▁Sun ▁and ▁other ▁astronom ical ▁objects . ▁It ▁was ▁launched ▁from ▁Mc M ur do ▁Station , ▁Ant arct ica ▁in ▁December ▁ 1 9 9 1 ▁and ▁ 1 9 9 2 . ▁Ste ady ▁wind s ▁carried ▁the ▁bal lo on ▁on ▁a ▁circ ump olar ▁flight ▁last ing ▁about ▁two