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pro vyhledávání: '"Y. A. S. Freitas"'
Autor:
L. A. Araujo, Welington Cerqueira, L. B. S. Betzler, A. S. Betzler, J. N. Jesus, Y. A. S. Freitas, V. B. Andrade, R. S. Almeida, P. A. S. Bispo, C. J. M. Prazeres
Publikováno v:
Advances in Space Research. 60:612-625
Our aim was to analyze the variation of Johnson-Kron-Cousins BVRI color indexes of a sample with 22 active comets of various dynamic groups with the time, geometrical, observational and dynamical parameters. We performed photometric observations of 1