A photometric and dynamic study of comet C/2013 A1 (Siding Spring) from observations at a heliocentric distance of ~4.1 AU


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Abstract

An analysis is presented for the photometric data on comet C/2013 A1 (Siding Spring) from observations at a large heliocentric distance (~4.1 AU). Comet C/2013 A1 (Siding Spring) displays intense activity despite the relatively large heliocentric distance. The morphology of the comet’s coma is analyzed. The following parameters are measured: the color indices V-R, the normalized spectral gradient of the reflectivity of the comet’s dust S', and the dust production rate Afρ. A numerical simulation is performed for the evolution of the comet’s orbit after a close encounter with Mars. The most probable values are obtained for the Keplerian orbital elements of the comet over a hundred-year period. The comet’s orbit remains nearly parabolic after passing the orbits of all the Solar System planets.

About the authors

Yu. S. Andrienko

Aff1

Author for correspondence.
Email: andrienko.j@univ.kiev.ua
Ukraine, Kyiv

A. V. Golovin

Main Astronomical Observatory

Email: andrienko.j@univ.kiev.ua
Ukraine, Kyiv

A. V. Ivanova

Main Astronomical Observatory

Email: andrienko.j@univ.kiev.ua
Ukraine, Kyiv

V. N. Reshetnik

Aff1; Main Astronomical Observatory

Email: andrienko.j@univ.kiev.ua
Ukraine, Kyiv; Kyiv

S. N. Kolesnik

Aff1

Email: andrienko.j@univ.kiev.ua
Ukraine, Kyiv

S. A. Borisenko

Main Astronomical Observatory

Email: andrienko.j@univ.kiev.ua
Ukraine, Kyiv

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