Polarization of Saturn’s moon Iapetus - III. Models of the bright and the dark sides C. Ejeta, K. Muinonen, H. Boehnhardt, S. Bagnulo, L. Kolokolova, D. Guirado and G. P. Tozzi A&A, 554 (2013) A117 Published online: 13 June 2013 DOI: 10.1051/0004-6361/201220467