Polarization opposition effect for the Galilean satellites of Jupiter |
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| Authors: | Vera K Rosenbush Nikolai N Kiselev |
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| Institution: | a Main Astronomical Observatory of National Academy of Sciences, Zabolotnoho Str. 27, 03680 Kyiv, Ukraine
b Institute of Astronomy of Kharkiv Karazin National University, Sumskaya Str. 35, 61022 Kharkiv, Ukraine |
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| Abstract: | We present results of polarimetric observations of the Galilean satellites Io, Europa, Ganymede, and Callisto at phase angles ranging from 0.19° to 2.22°. The observations in the UBVR filters were performed using a one-channel photoelectric polarimeter attached to 70-cm telescope of the Chuguev Observation Station (Ukraine) on November 19-December 7, 2000. We have observed the polarization opposition effect for Io, Europa, and Ganymede to be a sharp secondary spike of negative polarization with an amplitude of about −0.4% centered at phase angles of 0.2°-0.7° and superimposed on the regular negative polarization branch. Although these minima for Io, Europa, and Ganymede show many similarities, they also exhibit a number of distinctions. The polarization opposition effect appears to be wavelength-dependent, at least for Europa and Ganymede. No polarization opposition effect was found for Callisto. The results obtained are discussed within the framework of different mechanisms of light scattering. |
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| Keywords: | Callisto Europa Ganymede Io Polarimetry Satellites of Jupiter |
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