Determinação da forma de asteroides a partir da inversão de curvas de luz

• Autor(a) principal: Lattari, Victor Correa [UNESP]
• Data de Publicação: 2016
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/155310; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2017-03-30/000881550.pdf
• topic: Asteróides - Órbitas; Terra (Planeta) - Rotação; Luz - Velocidade; Asteroids Orbits

The ligthcurves are obtanied through the monitoring of variation of the intensity of reflect luminosity by one object in fuction of the time. In the case of asteroid, the shape of the ligthcurves depending of its physical characteristics, of its spin rotation and of the ligthing codition. The method of inversion ligthcurves was created by Kaasalainen e Torppa (2001) has as the goal to determine the spin rotation period, orientation of the spin rotation axis and the shape of the asteroid (described for a polyhedron model) through the photometric data (ligthcurves). The analyse of these phisical parameters is do from of one interative method with the goal to set one combination of these physical parameters that have the best fitting over all ligthcurves. To Apply the inversion ligthcurves method were developed some computational routinesand and modification in the programs to speed up the process and apply them in general form to any asteroid tha has the ligthcurves availiable in the data banks of MPC (Minor Planets Center). This method alo is dependent of the relative positon among the asteroid, earth and sun that were obtanied in the system Horizons of the NASA (National Aeronautics and Space Administration). This method was applied to more than 20 asteroids with the goal to obtain the shape model of the asteroid, rotation period and the pole parameters (λ e β )to determine the spin rotation. For all asteroids were determined the rotation period corroborating by the licterature. Otherwise, its not possible to determine the polo parmeters for all asteroids because they are not data enough and it will be discussed in this work