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

Published online by Cambridge University Press:  06 April 2010

Enos Picazzio ,
Elysandra Figueredo ,
Amaury Augusto de Almeida ,
Claudia Mendes de Oliveira  and
Klim Ivanovich Churyumov
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: [email protected]
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: [email protected]
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: [email protected]
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: [email protected]
Klim Ivanovich Churyumov
Affiliation:
Astronomical Observatory, Kyiv Shevchenko National University, Box 04053, Observatorna str., 3, Kyiv, Ukraine email: [email protected]
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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.

Keywords

comets: generalcomets: individual C/2005 E2 (McNaught)techniques: image processing
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S263: Icy Bodies of the Solar System , August 2009 , pp. 285 - 288
Copyright
Copyright © International Astronomical Union 2010

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