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The IMPACTON Project: Pole and Shape of Eight Near-Earth Asteroids

Published online by Cambridge University Press:  01 March 2016

José Sergio Silva
Affiliation:
Observatório Nacional, COAA, Rua Gal. José Cristino 77, 20921-400 Rio de Janeiro, Brazil email: jsergio@on.br, lazzaro@on.br
Daniela Lazzaro
Affiliation:
Observatório Nacional, COAA, Rua Gal. José Cristino 77, 20921-400 Rio de Janeiro, Brazil email: jsergio@on.br, lazzaro@on.br
Teresinha Rodrigues
Affiliation:
Observatório Nacional, COAA, Rua Gal. José Cristino 77, 20921-400 Rio de Janeiro, Brazil email: jsergio@on.br, lazzaro@on.br
Jorge Márcio Carvano
Affiliation:
Observatório Nacional, COAA, Rua Gal. José Cristino 77, 20921-400 Rio de Janeiro, Brazil email: jsergio@on.br, lazzaro@on.br
Fernando Roig
Affiliation:
Observatório Nacional, COAA, Rua Gal. José Cristino 77, 20921-400 Rio de Janeiro, Brazil email: jsergio@on.br, lazzaro@on.br
Roberto Souza
Affiliation:
Observatório Nacional, COAA, Rua Gal. José Cristino 77, 20921-400 Rio de Janeiro, Brazil email: jsergio@on.br, lazzaro@on.br
the IMPACTON team
Affiliation:
Observatório Nacional, COAA, Rua Gal. José Cristino 77, 20921-400 Rio de Janeiro, Brazil email: jsergio@on.br, lazzaro@on.br
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Abstract

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The formation and evolution of Solar System small bodies, in particular those in near-Earth orbits, is a complex problem which solution strongly depends on a better knowledge of their physical properties. To contribute to the international efforts in this direction the IMPACTON project (www.on.br/IMPACTON) set up a dedicated facility denominated Observatório Astronômico do Sertão de Itaparica (OASI). Using the 1-m telescope several dozens of NEAs were observed between March 2012 and October 2014. Here we will present the results obtained for 8 objects. Relative magnitudes were used to obtain lightcurves and derive rotational periods. Applying the inversion method developed by Kaasalainen and Torppa (2001) and Kaasalainen et al. (2001), along with lightcurves from literature, allowed to refine the rotational period of these asteroids as well as to derive their pole direction and shape. The obtained results confirm a lack of poles toward the ecliptic and with a majority of retrograde rotators. A more representative sample, however, is needed in order to drive robust conclusions.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2016 

Footnotes

Based on observations obtained at the Observatório Astronômico do Sertão de Itaparica - OASI, Itacuruba, Brazil

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