Polarization of Saturn’s moon Iapetus - II. Comparison of the dark and the bright sides C. Ejeta, H. Boehnhardt, S. Bagnulo, K. Muinonen, L. Kolokolova and G. P. Tozzi A&A, 549 (2013) A61 Published online: 19 December 2012 DOI: 10.1051/0004-6361/201220177