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@Article{OliveiraPrad:2020:SeStOr,
               author = "Oliveira, Thais Carneiro and Prado, Antonio Fernando Bertachini de 
                         Almeida",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)}",
                title = "Search for stable orbits around the binary asteroid systems 1999 
                         kw4 and didymos",
              journal = "Revista Mexicana de Astronomia y Astrofisica",
                 year = "2020",
               volume = "56",
                pages = "113--128",
             keywords = "Astrodin{\^a}mica, Astrodynamics, Manobras Orbitais, methods: 
                         numerical — minor planets, asteroids: general — space vehicles.",
             abstract = "This work includes analytical and numerical studies of spacecrafts 
                         orbiting two binary asteroid systems: 1999 KW4 and Didymos. The 
                         binary systems are modeled as full irregular bodies, such that the 
                         whole evolution of the results will show the impact of the 
                         irregular gravity field in the lifetime and dynamics of the 
                         spacecrafts orbit. The equations of motion of the binary system 
                         and the spacecraft are derived from Lagrange Equations. The solar 
                         radiation pressure is consired in the dynamics of the 
                         spacecraft.Two distinct methods are used to search for stable 
                         orbits around the binary systems. One is called the grid search 
                         method, which defines the main body as a point mass to estimate 
                         the initial state of the spacecraft based on a circular Keplerian 
                         orbit. The second method is the search for periodic orbits based 
                         on zero-velocity surfaces RESUMEN: Este trabajo presenta estudios 
                         anal´\ıticos y num´ericos sobre naves espaciales en ´orbita 
                         en torno a dos asteroides binarios: 1999 KW4 y Didymos. Se modelan 
                         los sistemas binarios como cuerpos irregulares, de modo que la 
                         evoluci´on muestre el impacto del campo de gravedad irregular 
                         sobre los tiempos de vida y la din´amica de la ´orbita de la nave. 
                         Se derivan las ecuaciones de movimiento del sistema binario y de 
                         la nave a partir de las ecuaciones de Lagrange. Se considera la 
                         presi´on de radiaci´on solar. Se buscan ´orbitas estables en torno 
                         a los sistemas binarios mediante dos m´etodos. El primero se 
                         conoce como el m´etodo de b´usqueda en la malla, y considera al 
                         cuerpo principal como punto masa para estimar el estado inicial de 
                         la nave a partir de una ´orbita Kepleriana circular. El segundo 
                         busca ´orbitas peri´odicas mediante las superficies de cero 
                         velocidad.",
                  doi = "10.22201/ia.01851101p.2020.56.01.12",
                  url = "http://dx.doi.org/10.22201/ia.01851101p.2020.56.01.12",
                 issn = "0185-1101",
                label = "lattes: 7340081273816424 2 OliveiraPrad:2020:SESTOR",
             language = "en",
           targetfile = "Oliveira_search.pdf",
        urlaccessdate = "25 jan. 2021"
}


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