Abstract
Although preliminary orbit methods do not appear to be urgently needed at the present time (because nominal or design orbits are in themselves satisfactory preliminary orbits), it will not be too long until our observation stations may have the requirement thrust upon them to acquire and to determine the orbit of a vehicle whose orbit was previously unknown to them. This may be particularly true of a lunar observatory where communication problems may be grave, and where an erroneous mid-course correction may cause the space vehicle to be so far from its normal orbit that a new preliminary orbit would have to be generated.
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