Polarization opposition effect for the Galilean satellites of Jupiter

Details Polarization opposition effect for the Galilean satellites of Jupiter Polarization opposition effect for the Galilean satellites of Jupiter

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005icar..179..490r&link_type=abstract

Icarus, Volume 179, Issue 2, p. 490-496.

Physics

12

Scientific paper

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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