@Article{SantosPrad:2012:OpLoTr,
               author = "Santos, Denilson Paulo Souza dos and Prado, Antonio Fernando 
                         Bertachini de Almeida",
          affiliation = "{} and {Instituto Nacional de Pesquisas Espaciais (INPE)}",
                title = "Optimal Low-Thrust Trajectories to Reach the Asteroid Apophis",
              journal = "WSEAS Transactions on Applied and Theoretical Mechanics",
                 year = "2012",
               volume = "7",
               number = "3",
                pages = "241--251",
             keywords = "astrodynamics, celestial mechanics, space trajectories, 
                         low-thrust, solar electric propulsion.",
             abstract = "Apophis is considered by the Greeks as chaos, the God of 
                         destruction. For this reason, in current times, this name returns 
                         to scene to represent a destructive potential threat to the Earth. 
                         It is the name of an asteroid that orbits a region that represents 
                         a high risk of collision with the Earth. This asteroid was 
                         discovered in 2004 and received the initial name of 2004MN4. Then 
                         it was named Apophis, and several researchers and institutes are 
                         monitoring and designing missions with the goal of finding more 
                         information about the asteroid. The present research has the goal 
                         of finding optimal (in the sense of minimum fuel consumption) 
                         interplanetary missions, based in low thrust propulsion systems to 
                         send a spacecraft to Apophis. The spacecraft is assumed to leave 
                         the Earth from a Low Earth Orbit (LEO). An indirect optimization 
                         method is used in the simulations to find the trajectories. Two 
                         different engines will be used to determine the trajectories: the 
                         PPS1350 and the Phall 1. This is done to get some insights of the 
                         differences between a propulsion system that has a fixed magnitude 
                         for the force and one that has a magnitude that varies with the 
                         distance between the spacecraft and the Sun. Another reason to 
                         perform this research is to test the parameters of the Phall 1, 
                         that is an engine under development.",
                 issn = "1991-8747",
                label = "lattes: 5351862393409206 1 SantosPrad:2012:OpLoTr",
             language = "en",
                  url = "http://www.wseas.org/wseas/cms.action?id=2781",
        urlaccessdate = "30 abr. 2024"
}