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Near infrared photometry of comet C/2005 E2 (McNaught)

Published online by Cambridge University Press:  06 April 2010

Enos Picazzio
Affiliation:
Department of Astronomy, Institute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo, Rua do Matão 1226, Cidade Universitária 05508-900 São Paulo SP, BRAZIL email: picazzio@astro.iag.usp.br
Elysandra Figueredo
Affiliation:
Department of Astronomy, Institute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo, Rua do Matão 1226, Cidade Universitária 05508-900 São Paulo SP, BRAZIL email: picazzio@astro.iag.usp.br
Amaury Augusto de Almeida
Affiliation:
Department of Astronomy, Institute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo, Rua do Matão 1226, Cidade Universitária 05508-900 São Paulo SP, BRAZIL email: picazzio@astro.iag.usp.br
Claudia Mendes de Oliveira
Affiliation:
Department of Astronomy, Institute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo, Rua do Matão 1226, Cidade Universitária 05508-900 São Paulo SP, BRAZIL email: picazzio@astro.iag.usp.br
Klim Ivanovich Churyumov
Affiliation:
Astronomical Observatory, Kyiv Shevchenko National University, Box 04053, Observatorna str., 3, Kyiv, Ukraine email: klim.churyumov@observ.univ.kiev.ua
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Abstract

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We present results of JHK photometry for comet C/2005 E2 (McNaught). Observations were made with the OSIRIS imager at the SOAR telescope, on Sept. 26-27, 2005. The dependence of the main parameters on the angular distance from the cometary photometric nucleus is discussed. We considered concentric rings around the photometric nucleus of the comet, with the radius determined by the aperture. Integrated flux in the ring, surface brightness, J-H and H-K color indices, and mean flux decay were obtained for each ring. A phometric radial profile was also obtained by tracing average values of the ace brightness for increasing values of radii in isophotes which allowed us to compute the azimuthally averaged surface brightness of the coma. The images centered on the photometric nucleus show three jets from active areas on the nucleus.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2010

References

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