@Article{VendittiRocc:2018:MoAsAs,
author = "Venditti, F. C. F. and Rocco, Evandro Marconi",
affiliation = "Planetary Radar, Arecibo Observatory and {Instituto Nacional de
Pesquisas Espaciais (INPE)}",
title = "Modeling asteroids to assist in orbiting and landing missions",
journal = "Advances in the Astronautical Sciences",
year = "2018",
volume = "162",
pages = "2041--2060",
note = "AAS/AIAA Astrodynamics Specialist Conference, 2017; Stevenson;
United States; 20 August 2017 through 24 August 2017",
abstract = "Asteroids are rotating bodies with asymmetric distribution of
mass, which makes the gravitational field around them different
from spherical bodies. In order to more accurately study the
gravitational field around these objects, it is necessary to have
a physical model. To simplify the model of an asteroid, it is
common to use approximations to simple shapes such as ellipsoids.
However, this may lead to an imprecise model, especially when the
asteroid has a very asymmetric shape. Thus, a new methodology
developed to model the gravitational field of the asteroids is
presented, called Mascon-layer model. It consists in using a
polyhedron shape model, which is built using observational data,
thus giving a good approximation of the real shape of the object.
This shape model is then transformed into layers of mass
concentrations. The gravitational potential is obtained using the
new model, and then applied to analyze very close orbits on the
collision boundary, and very distant orbits on the verge of
escaping the sphere of influence of the asteroid's gravitational
field. Orbital maneuvers, using continuous low thrust in closed
loop, were also performed. One of the advantages of the
methodology developed is that it is possible to use a simpler
approach, requiring less computational effort, but still using a
reliable source for the shape model.",
issn = "0065-3438.",
language = "en",
urlaccessdate = "04 dez. 2020"
}