@Article{MescolottiPradChiaGome:2017:SeSoNa,
               author = "Mescolotti, Bruna Yukiko Pinheiro Masago and Prado, Antonio 
                         Fernando Bertachini de Almeida and Chiaradia, Ana Paula Marins and 
                         Gomes, Vivian Martins",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Universidade Estadual 
                         Paulista (UNESP)} and {Universidade Estadual Paulista (UNESP)}",
                title = "Searching for some natural orbits to observe the double asteroid 
                         2002CE26",
              journal = "Astrophysics and Space Science",
                 year = "2017",
               volume = "362",
               number = "7",
                pages = "Article number 130",
                month = "July",
             keywords = "Astrodynamics, Small bodies, Space Trajectories, Asteroids.",
             abstract = "Knowledge of the Solar System is increasing with data coming from 
                         space missions to small bodies. A mission to those bodies offers 
                         some problems, because they have several characteristics that are 
                         not well known, like their shapes, sizes and masses. The present 
                         research has the goal of searching for trajectories around the 
                         double asteroid 2002CE26, a system of Near-Earth Asteroids (NEAs) 
                         of the Apollo type. For every trajectory of the spacecraft, the 
                         evolution of the distances between the spacecraft and the two 
                         bodies that compose the system is crucial, due to its impact in 
                         the quality of the observations made from the spacecraft. 
                         Furthermore, this study has a first objective of searching for 
                         trajectories that make the spacecraft remain as long as possible 
                         near the two bodies that compose the asteroid system, without the 
                         use of orbital maneuvers. The model used here assumes elliptical 
                         orbits for the asteroids. The effect of the solar radiation 
                         pressure is also included, since it is a major perturbing force 
                         acting in spacecrafts traveling around small bodies. The natural 
                         orbits found here are useful for the mission. They can be used 
                         individually or combined in several pieces by orbital maneuvers. 
                         Another point considered here is the importance of the errors in 
                         the estimation of the physical parameters of the bodies. This task 
                         is very important, because there are great uncertainties in these 
                         values because the measurements are based on observations made 
                         from the Earth. It is shown that a variation of those parameters 
                         can make very large modifications in the times that the spacecraft 
                         remains close to the bodies of the system (called here 
                         observational times). Those modifications are large enough to make 
                         the best trajectories obtained under nominal conditions to be 
                         useless under some errors in the physical parameters. So, a search 
                         is made to find trajectories that have reasonable observation 
                         times for all the assumed error scenarios for the two bodies, 
                         because those orbits can be used as initial parking orbits for the 
                         spacecraft. We called these orbits quasi-stable orbits, in the 
                         sense that they do not collide with any of the primaries nor 
                         travel to large distances from them. From these orbits, it is 
                         possible to make better observations of the bodies in any 
                         scenario, and a more accurate estimation of their sizes and masses 
                         is performed, so giving information to allow for other choices for 
                         the orbit of the spacecraft.",
                  doi = "10.1007/s10509-017-3094-z",
                  url = "http://dx.doi.org/10.1007/s10509-017-3094-z",
                 issn = "0004-640X",
             language = "en",
           targetfile = "mescolotti_searching.pdf",
        urlaccessdate = "27 abr. 2024"
}