Optical space weathering on Vesta: Radiative-transfer models and Dawn observations

David T. Blewett, Brett W. Denevi, Lucille Le Corre, Vishnu Reddy, Stefan E. Schröder, Carle M. Pieters, Federico Tosi, Francesca Zambon, Maria Cristina De Sanctis, Eleonora Ammannito, Thomas Roatsch, Carol A. Raymond, Christopher T. Russell