author = "Marchi, Luis Ot{\'a}vio and Venditti, Flaviane and Misra, Arun 
                         and Prado, Antonio Fernando Bertachini de Almeida",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Arecibo 
                         Observatory} and {Mc Gill Institute for Aerospace Engineering} and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)}",
                title = "Effect of earth-moon perturbation ont he deflection of tethered 
                         asteroid systems",
                 year = "2018",
         organization = "International Astronautical Congress, 69.",
             abstract = "In recent years, several celestial bodies with different shapes 
                         and sizes have been detected as they approach dangerously the 
                         Earths orbit. The threat of an impact with our planet has 
                         encouraged many studies of Potentially Hazardous Asteroids (PHA). 
                         In the literature, one can find several techniques for the 
                         deflection of PHAs according to the available time to plan and 
                         execute the mission. In 2022, for example, NASAs DART mission 
                         plans to perform the first kinetic impact experiment of a 
                         spacecraft on the moon of a double asteroid system. In this work, 
                         a previously studied deflection method is considered, which 
                         consists of a PHA connected to a smaller asteroid with a tether. 
                         The physical principle of the chosen technique is the displacement 
                         of the center of mass of the system. The dynamics of all bodies 
                         involved are assumed to be on the plane of the PHA, therefore 
                         asteroids Bennu and Itokawa were adopted for having low 
                         inclination orbit. The tethered system rotates with the angular 
                         velocity of the main body due to the constraint imposed by 
                         connecting the two bodies with a tether (rigid and negligible 
                         mass). The focus of the present work is to analyze the influence 
                         of the Earth-Moon perturbation on the dynamics of the 
                         PHA-tether-asteroid system. It is expected that this effect 
                         becomes more evident in regions of orbital interaction between the 
                         planet and these rocky bodies. The effects of the gravitational 
                         perturbation caused by the interaction between the binary asteroid 
                         system and the Earth-Moon system is quantified as the difference 
                         between the perturbed and unperturbed positions of the PHA after a 
                         certain time, and also its minimum distance from the Earth. The 
                         tether technique was adopted as a solution to avoid fragmentation 
                         debris that can be generated by the impact method, allowing to 
                         deflect the whole body without causing unpredictable consequences. 
                         In addition, another application would be to transfer these bodies 
                         closer to the Earths orbit to explore them scientifically as well 
                         as commercially. In this regard, the ongoing Osiris-Rex mission 
                         plans to collect a small sample of asteroid Bennu, which can 
                         possibly provide important information about the origin of the 
                         Solar System.",
  conference-location = "Bremen",
      conference-year = "01-05 oct.",
             language = "pt",
           targetfile = "IAC-18,marchi.pdf",
        urlaccessdate = "28 nov. 2020"