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U 0 -freestream velocity fps Z = altitude, ft a = standard deviation

Orbital lifetime estimates for long lifetimes (> 30 years) are presented for initial eccentricities from 0 to 0.95 and for perigee altitudes from 200 to 1600 km. The lifetime estimates are based on a semianalytic form of the equations of motion developed by King-Hele and the latest (1971) Jacchia atmospheric model. A mean 11 year solar cycle based on historical records of the Zurich sunspot number is employed in the calculations. Comparisons are made to previously published lifetime charts.