This paper presents an investigation of dual launch lunar architecture options for conducting missions to the Moon. Altair and Orion payload requirements for the dual launch mission concept with Lunar Orbit Rendezvous (LOR) are computed for three architecture options, each with a different way of accommodating multiple Orion launch opportunities at the Earth. Benefits and drawbacks of each option are discussed and the overall mission performance is compared with that of the Constellation Program lunar architecture.
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