The lunar crater observation and sensing satellite (lcross) mission requires pre-calculation ofthe range of energies associated with the never-before-tried impact of a united launch alliance "centaur" upper rocket stage. solution: producing a set of pre-calculations for every contingency will allow mission directors to react tolikely scenarios as different events may arise.

calculation details: 1. lcross contained two sub-spacecraft that were intended to separate 9 hours and 40 minutes (a distance of 87,000km) before they reached the moon.
a. the centaur "impactor" vehicle
b. the shepherding spacecraft (s-s/c)