▁optical ▁reconna issance ▁satellite ▁which ▁was ▁lost ▁in ▁a ▁launch ▁failure ▁in ▁ 1 9 6 1 . ▁It ▁was ▁a ▁K H - 2 ▁Cor ona ' ▁satellite , ▁based ▁on ▁an ▁A gen a - B . ▁ ▁The ▁launch ▁of ▁Disc over er ▁ 2 2 ▁occurred ▁at ▁ 2 0 : 3 4 : 4 3 ▁UTC ▁on ▁ 3 0 ▁March ▁ 1 9 6 1 . ▁A ▁Thor ▁DM - 2 1 ▁A gen a - B ▁ro cket ▁was ▁used , ▁flying ▁from ▁launch ▁pad ▁ 7 5 - 3 - 4 ▁at ▁the ▁V anden berg ▁Air ▁Force ▁Base . ▁Due ▁to ▁a ▁mal function ▁of ▁the ▁ro cket ' s ▁second ▁stage , ▁it ▁failed ▁to ▁achieve ▁orbit . ▁ ▁Disc over er ▁ 2 2 ▁was ▁to ▁have ▁operated ▁in ▁a ▁low ▁Earth ▁orbit . ▁It ▁had ▁a ▁mass ▁of ▁, ▁and ▁was ▁equ ipped ▁with ▁a ▁pan or am ic ▁camera ▁with ▁a ▁foc al ▁length ▁of ▁, ▁which ▁had ▁a ▁maximum ▁resolution ▁of ▁. ▁Im ages ▁were ▁to ▁have ▁been ▁recorded ▁onto ▁ ▁film , ▁and ▁returned ▁in ▁a ▁Sat ellite ▁Rec overy ▁Ve h icle . ▁The ▁Sat ellite ▁Rec overy ▁Ve h icle ▁carried ▁ab o ard ▁Disc over er ▁ 2 2 ▁was ▁SR V - 5 0 9 . ▁ ▁References ▁ ▁Category : Space craft ▁launched ▁in ▁ 1 9 6 1 ▁Category : S at ellite ▁launch ▁fail ures <0x0A> </s> ▁A ▁chart ▁with ▁the