 analysi corridor guidanc requir supercircular entri planetari atmospher analysi corridor guidanc requir supercircular entri planetari atmospher analysi present supercircular entri planet's atmospher attent corridor spacecraft guid order accomplish maneuv dimensionless paramet base condit conic perige altitud introduc character supercircular entri conveni prescrib corridor width associ ellipt parabol hyperbol approach trajectori analysi appli vehicl arbitrari weight shape size illustr calcul venu earth mar jupit titan nonlift vehicl fix aerodynam coeffici curv present dimensionless paramet calcul maximum deceler maximum rate laminar convect heat total laminar heat absorb singl-pass entri veloc circular veloc lift vehicl curv present maximum deceler overshoot boundari entri corridor equat present estim laminar aerodynam heat maximum deceler corridor width independ vehicl weight dimens drag coeffici provid overshoot boundari undershoot corridor planet broaden markedli applic aerodynam lift exampl 10-earth-g corridor width singl-pass nonlift parabol entri increas 52 51 52 mile emploi lift-drag ratio 1 aerodynam lift increas appreci corridor mar titan corridor width decreas rapidli entri veloc increas termin guidanc requir accuraci veloc flight path angl enter corridor compar analog requir put satellit orbit hit moon earth achiev icbm accuraci consider termin guidanc problem involv planet's atmospher--rather rocket fuel--to orbit transfer heliocentr planeto-centric motion convert hyperbol approach trajectori ellipt orbit target planet fuel save maneuv appear technolog feasibl planetari voyag impli possibl achiev larg reduct requir earth lift-off weight chemic propuls system 