@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 = "21 maio 2024"
}