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@InProceedings{NegriSarlPrad:2018:MaTrAs,
               author = "Negri, Rodolfo Batista and Sarli, Bruno and Prado, Antonio 
                         Fernando Bertachini de Almeida",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Catholic 
                         University of America} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)}",
                title = "Mapping trajectories of an asterois that is deflected by a 
                         collision",
                 year = "2018",
         organization = "International Astronautical Congress, 69.",
             abstract = "The evidences of collisions between celestial bodies in the solar 
                         system are well known, from small craters on asteroids to large 
                         impacts on Mercury and the Moon. As recent events showed, an 
                         important contribution to the field of planetary defense is the 
                         study of the best form to deflect asteroids from a possible Earth 
                         collision, saving countless lives (BOARD; COUNCIL et al., 2010). 
                         Several options have been considered, however, most studies are 
                         based in deflections generated by an impulse applied to the 
                         asteroid target. One of the mechanisms used to generate this 
                         impulsive relies in a kinetic impact momentum transfer generated 
                         by the impact of one or more spacecrafts on the asteroids surface. 
                         This, in turn, instantaneously changes the target velocity and, by 
                         extension, its orbit characteristics. The impulse is to be 
                         calculated in such a way that the asteroids orbit is modified 
                         enough to avoid a collision with Earth. In this context, the 
                         objective of this work is to search for the best impulse geometry 
                         for a planetary collision avoidance. All the possible angles to 
                         hit the asteroid are simulated, generating a map of the effects of 
                         this collision in the minimum orbit intersection distance (MOID), 
                         between the Earth and the asteroid. Several values are assumed for 
                         the impulse, velocity increment, applied to the asteroid, as well 
                         as for the deflection time before the predicted closest approach. 
                         The impact mapping gives a general idea of the best conditions to 
                         deflect the asteroid, as well as the associated value of the 
                         velocity variation. In order to do so, it is assumed a Circular 
                         Restricted Three-Body Problem system, composed by an asteroid, the 
                         Earth and the Sun; where the asteroid is in a collision course 
                         with the Earth. The problem consist in applying an impulse to the 
                         asteroid, producing a variation in its velocity, in such a way 
                         that it modifies its trajectory enough to avoid a collision with 
                         the Earth. The velocity variation is defined by a magnitude and 
                         two angles in the asteroids local reference frame. This type of 
                         map can show the general behavior of the trajectories and guide 
                         more detailed studies about this topic.",
  conference-location = "Bremen",
      conference-year = "01-05 oct.",
             language = "pt",
           targetfile = "IAC-2018_negri.pdf",
        urlaccessdate = "24 nov. 2020"
}


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