author = "Carvalho, J. P. S. and Vilhena De Moraes, R. and Prado, Antonio 
                         Fernando Bertachini de Almeida",
          affiliation = "{Universidade Federal de S{\~a}o Paulo (UNIFESP)} and 
                         {Universidade Federal de S{\~a}o Paulo (UNIFESP)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)}",
                title = "Searching less perturbed circular orbits for a spacecraft 
                         travelling around Europa",
              journal = "Mathematical Problems in Engineering",
                 year = "2014",
               volume = "2014",
             keywords = "Gravitation, Interplanetary flight, Satellites, Circular orbit, 
                         Dynamical model, Gravitational potential, Natural satellites, 
                         Orbital element, Perturbing forces, Space activities, Third-body 
                         perturbations, Orbits.",
             abstract = "Space missions to visit the natural satellite of Jupiter, Europa, 
                         constitute an important topic in space activities today, because 
                         missions to this moon are under study now. Several considerations 
                         have to be made for these missions. The present paper searches for 
                         less perturbed circular orbits around Europa. This search is made 
                         based on the total effects of the perturbing forces over the time, 
                         evaluated by the integral of those forces over the time. This 
                         value depends on the dynamical model and on the orbit of the 
                         spacecraft. The perturbing forces considered are the third-body 
                         perturbation that comes from Jupiter and the J 2, J 3, and C 22 
                         terms of the gravitational potential of Europa. Several numerical 
                         studies are performed and the results show the locations of the 
                         less perturbed orbits. Using those results, it is possible to find 
                         near-circular frozen orbits with smaller amplitudes of variations 
                         of the orbital elements.",
                  doi = "10.1155/2014/529716",
                  url = "http://dx.doi.org/10.1155/2014/529716",
                 issn = "1024-123X",
                label = "scopus 2014-11 CarvalhoVilhPrad:2014:SeLePe",
             language = "en",
           targetfile = "Carvalho_searching.pdf",
        urlaccessdate = "30 nov. 2020"