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@PhDThesis{Gonçalves:2018:TrPeFo,
               author = "Gon{\c{c}}alves, Liana Dias",
                title = "Trajet{\'o}rias perturbadas por for{\c{c}}as de origem 
                         gravitacional e n{\~a}o gravitacional aplicadas a um 
                         sat{\'e}lite artificial na vizinhan{\c{c}}a de Marte, Fobos e 
                         Deimos",
               school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
                 year = "2018",
              address = "S{\~a}o Jos{\'e} dos Campos",
                month = "2018-03-28",
             keywords = "din{\^a}mica orbital, perturba{\c{c}}{\~o}es, sat{\'e}lites 
                         artificiais, sat{\'e}lites naturais, campo gravitacional n{\~a}o 
                         central, harm{\^o}nicos esf{\'e}ricos, orbital dynamics, 
                         perturbations, artificial satellites, natural satellites, 
                         non-central gravitational field, spherical harmonics.",
             abstract = "O sistema composto por Marte, Fobos e Deimos possui algumas 
                         caracter{\'{\i}}sticas particulares que comp{\~o}em um 
                         interessante objetivo de estudo: Fobos e Deimos possuem 
                         {\'o}rbitas pr{\'o}ximas a Marte cujos raios orbitais s{\~a}o 
                         de aproximadamente 9000 km e 23000 km, respectivamente, al{\'e}m 
                         de um formato irregular. Sendo assim, uma miss{\~a}o visando 
                         orbitar um dos sat{\'e}lites naturais de Marte, seja para um 
                         r{\'a}pido sobrevoo, ou objetivando pouso na superf{\'{\i}}cie, 
                         est{\'a} sujeita a uma intensa perturba{\c{c}}{\~a}o orbital 
                         devido {\`a} atra{\c{c}}{\~a}o gravitacional de Marte, o que 
                         dificulta de forma significativa manter o sat{\'e}lite em uma 
                         {\'o}rbita est{\'a}vel ao redor das luas por um longo 
                         per{\'{\i}}odo de tempo. Al{\'e}m disso, o formato n{\~a}o 
                         esf{\'e}rico das luas faz com que seu campo gravitacional 
                         n{\~a}o seja central. Levando em considera{\c{c}}{\~a}o as 
                         dificuldades citadas, o presente trabalho busca encontrar casos 
                         onde seja poss{\'{\i}}vel manter o sat{\'e}lite pr{\'o}ximo 
                         {\`a}s luas pelo m{\'a}ximo tempo poss{\'{\i}}vel. Para esse 
                         estudo foi considerada a perturba{\c{c}}{\~a}o devido ao 
                         potencial gravitacional de Marte, considerando a expans{\~a}o dos 
                         harm{\^o}nicos esf{\'e}ricos at{\'e} grau e ordem 80 e um 
                         modelo poliedral para distribui{\c{c}}{\~a}o de massa de Fobos, 
                         al{\'e}m da atra{\c{c}}{\~a}o gravitacional do Sol e de Deimos 
                         para o caso do sat{\'e}lite na vizinhan{\c{c}}a de Fobos, e de 
                         Fobos para o caso do sat{\'e}lite na vizinhan{\c{c}}a de Deimos. 
                         Tal estudo pretende contribuir com a busca por trajet{\'o}rias 
                         minimamente perturbadas na vizinhan{\c{c}}a de Fobos e Deimos, 
                         bem como estudar como manobrar o ve{\'{\i}}culo de modo a 
                         aproxim{\'a}-lo da superf{\'{\i}}cie da lua, quesitos 
                         significativamente importantes tanto para o sobrevoo quanto para o 
                         pouso. ABSTRACT: The moons system of Mars, composed by Phobos and 
                         Deimos, has some special features which represent an interesting 
                         study objective: Phobos and Deimos have orbits near to Mars whose 
                         orbital radius are approximately 9000 km and 23000 km 
                         respectively, in addition these bodies are characterized by 
                         irregular shapes. Thus, a mission aiming to orbit one of the 
                         natural satellites of Mars, whether for a rapid overflight or 
                         landing on the surface, is subject to intense orbital disturbance 
                         due to the Mars gravitational attraction, which makes it 
                         significantly difficult to maintain the artificial satellite in a 
                         stable orbit around the moons for a long period of time. Besides, 
                         the non-spherical shape of the moons makes their gravitational 
                         field not central. Taking into account the difficulties mentioned, 
                         the present work seeks to find cases where it is possible to keep 
                         the satellite near to the moons for the maximum possible time. For 
                         this study was considered the perturbation due to the 
                         gravitational potential of Mars, considering the expansion of the 
                         spherical harmonics up to degree and order 80 and a polyhedral 
                         model for the mass distribution of Phobos, and also the 
                         gravitational attraction of the Sun and Deimos for the case of the 
                         satellite in the Phobos vicinity, and Phobos for the case of the 
                         satellite in the Deimos vicinity. Therefore this study intends to 
                         contribute to the search for trajectories in the Phobos and Deimos 
                         vicinity, as well as to study how to maneuver the vehicle so as to 
                         bring it closer to the surface of the moon, which are 
                         significantly important knowledge for missions that aim to 
                         overflight and landing.",
            committee = "Pilchowski, Hans-Ulrich (presidente) and Rocco, Evandro Marconi 
                         (orientador) and Moraes, Rodolpho Vilhena de (orientador) and 
                         Costa Filho, Aguinaldo Cardozo da and Silva, William Reis",
         englishtitle = "Trajectories disturbed by gravitational and non-gravitational 
                         forces applied to an artificial satellite in the vicinity of Mars, 
                         Fobos and Deimos",
             language = "pt",
                pages = "197",
                  ibi = "8JMKD3MGP3W34R/3QTLK85",
                  url = "http://urlib.net/rep/8JMKD3MGP3W34R/3QTLK85",
           targetfile = "publicacao.pdf",
        urlaccessdate = "30 nov. 2020"
}


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