▁at ▁ 7 . 4 5 ▁degrees ▁S , ▁ 1 7 9 . 8 ▁degrees ▁east . ▁A ▁second ▁par ach ute ▁opened ▁at ▁an ▁alt itude ▁of ▁ 5 5   km , ▁ 2 0 0 ▁seconds ▁after ▁entry , ▁extract ing ▁the ▁fur led ▁bal lo on . ▁ ▁The ▁bal lo on ▁was ▁infl ated ▁ 1 0 0 ▁seconds ▁later ▁at ▁ 5 4   km ▁and ▁the ▁par ach ute ▁and ▁infl ation ▁system ▁were ▁j ett ison ed . ▁The ▁ball ast ▁was ▁j ett ison ed ▁when ▁the ▁bal lo on ▁reached ▁roughly ▁ 5 0   km ▁and ▁the ▁bal lo on ▁flo ated ▁back ▁to ▁a ▁stable ▁height ▁between ▁ 5 3 ▁and ▁ 5 4   km ▁some ▁ 1 5 ▁to ▁ 2 5 ▁minutes ▁after ▁entry . ▁The ▁mean ▁stable ▁height ▁was ▁ 5 3 . 6   km , ▁with ▁a ▁pressure ▁of ▁ 5 3 5 ▁m bar ▁and ▁a ▁temperature ▁of ▁ ▁in ▁the ▁middle , ▁most ▁active ▁layer ▁of ▁the ▁Ven us ▁three - t ier ed ▁cloud ▁system . ▁The ▁bal lo on ▁dr ift ed ▁west ward ▁in ▁the ▁z onal ▁wind ▁flow ▁with ▁an ▁average ▁speed ▁of ▁about ▁ 6 6   m / s ▁at ▁nearly ▁constant ▁latitude . ▁The ▁pro be ▁crossed ▁the ▁termin ator ▁from ▁night ▁to ▁day ▁at ▁ 9 : 1 0 ▁U T ▁on ▁ 1 6 ▁June ▁after ▁travers ing ▁ 7 4 0 0