title: Puzzling asteroid 21 Lutetia: our knowledge prior to the Rosetta fly-by
abstract: <i>Aims. <i/>A wide observational campaign was carried out in 2004–2009 that aimed to complete the ground-based investigation of Lutetia prior to the Rosetta fly-by in July 2010.<i>Methods. <i/>We obtained <i>BVRI<i/> photometric and <i>V<i/>-band polarimetric measurements over a wide range of phase angles, and visible and infrared spectra in the 0.4–2.4 <i>μ<i/>m range. We analyze them with previously published data to retrieve information about Lutetia's surface properties.<i>Results. <i/>Valu
journal: Astronomy and Astrophysics