By Jeffrey S. Parker
"Based on years of study performed on the NASA Jet Propulsion Laboratory, Low-Energy Lunar Trajectory layout presents high-level info to project managers and distinctive details to project designers approximately low-energy transfers among Earth and the moon. The e-book solutions high-level questions about the supply and function of such transfers in any given month and yr. Low-energy lunar transfers are in comparison with a number of different forms of transfers, and put in the context of old missions. utilizing this e-book, designers may possibly reconstruct any move defined therein, in addition to layout related transfers with specific layout parameters." -- �Read more...
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Extra info for Low-energy lunar trajectory design
The GRAIL targets included the right ascension and declination of the instantaneous apogee vector at the target interface time, referred to as RAV and DAV . Trans-Lunar Cruise. A spacecraft's trans-lunar cruise on its low-energy lunar transfer takes it beyond the orbit of the Moon and typically in a direction toward either the second or fourth quadrant in the Sun-Earth synodic coordinate system . The spacecraft typically ventures 1-2 million kilometers away from the Earth, where the Sun's gravity becomes very influential.
20 INTRODUCTION AND EXECUTIVE SUMMARY Figure 1-11 The transfer trajectory of WMAP . Genesis. On August 8, 2001, Genesis launched and was quickly injected into a halo orbit about the Sun-Earth Li point. It traversed the halo orbit approximately five times, spending more than 2 years in the libration orbit collecting solar wind samples before turning back toward the Earth. 8 x 106 km) detour to visit the Sun-Earth L2 point. The detour allowed it to deposit its science pay load on the sunlit-side of the Earth.
6-hour transfer to the Moon: longer to save fuel mass so that it would be capable of returning to the Earth. 1-hour lunar transfer. The first human landing, and first successful sample return was performed earlier, by Apollo 11. The direct transfer that Apollo 11 took required about 73 hours, which was shorter in time and required more fuel, but required less total consumable mass than a longer transfer since the mission involved human occupants. 2 Low-Energy Missions to the Sun-Earth Lagrange Points ISEE-3.
Low-energy lunar trajectory design by Jeffrey S. Parker