Analysis of the intensity photometric of comet inner coma

Department of Astronomy and Space, College of Science, University of Baghdad, Baghdad, Iraq

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Abstract

In this research, image of comet Leonard (C/2021 A1 Leonard), Hale-Bopp (C/1995 O1 Hale-Bopp), (C/2020 F3 NEOWISE) and (C/2006 P1 McNaught) were studied and analyzed for the purpose of studying the distribution of light intensity across the primary colors (red, green, blue) to understand the physical characteristics of light intensity with distance using the MATLAB program. And to find the relationship of each comet and how to change the behavior of the light intensity of these comets, as the results showed a good relationship to the distribution of intensity and how the change occurs in the brightness of each comet. As a result, we notice that as the distance increases, the brightness gradually increases, and the relationship is direct, but at values ranging from (100-150), the intensity begins to decrease gradually as the distance increases. As a comet approaches the Sun, the icy material in its nucleus begins to sublimate, releasing complex organic molecules into the coma. These protomolecules were tracked using infrared and radio wave detection techniques.