@Article{MeloMacaWint:2009:AlTrNE,
               author = "Melo, Cristiano Fiorilo de and Macau, Elbert E. Neher and Winter, 
                         Othon Cabo",
          affiliation = "{} and {Instituto Nacional de Pesquisas Espaciais (INPE)} and 
                         Mechanical engineering Schol, state university of Sao Paulo at 
                         Guaratinguet{\'a}, Brazil",
                title = "Alternative Transfers to the NEOs 99942 Apophis, 1994 WR12, and 
                         2007 UW1 via Derived Trajectories from Periodic Orbits of Family 
                         G",
              journal = "Mathematical Problems in Engineering",
                 year = "2009",
               volume = "Article ID 303604",
             abstract = "Swing-by techniques are extensively used in interplanetary 
                         missions to minimize fuel consumption and to raise payloads of 
                         spacecrafts. The effectiveness of this type of maneuver has been 
                         proven since the beginning of space exploration. According to this 
                         premise, we have explored the existence of a natural and direct 
                         link between low Earth orbits and the lunar sphere of influence to 
                         get low-energy transfer trajectories to the Near Earth Objects 
                         (NEOs) 99942 Apophis, 1994 WR12, and 2007 UW1 through swing-bys 
                         with the Moon. The existence of this link is related to a family 
                         of retrograde periodic orbits around the Lagrangian equilibrium 
                         point L1 predicted for the circular, planar, restricted three-body 
                         Earth-Moon-particle problem. The trajectories in this link are 
                         sensitive to small disturbances. This enables them to be 
                         conveniently diverted reducing so the cost of the swing-by 
                         maneuver. These maneuvers allow a gain in energy sufficient for 
                         the trajectories to escape from the Earth-Moon system and to 
                         stabilize in heliocentric orbits between the Earth and Venus or 
                         Earth and Mars. Therefore, the trajectories have sufficient reach 
                         to intercept the NEOs' orbits.",
                  doi = "10.1155/2009/303604",
                  url = "http://dx.doi.org/10.1155/2009/303604",
                 issn = "1024-123X and 1563-5147",
             language = "en",
           targetfile = "303604.pdf",
        urlaccessdate = "29 jun. 2024"
}