Brightness and polarimetric phase functions for analogues of cometary dust as compared to 67P dust observations from Rosetta and various remote observations

Rosetta experiments have provided a ground truth about cometary dust particles composition, size and structure. They allow comparisons between their properties and those of previously suggested analogues. These had been suggested from experimental simulations (with PROGRA2 experiment) of the light scattering properties of 67P/Churyumov-Gerasimenko and other comets, observed from the Earth or its environment. The brightness phase curves obtained by OSIRIS multi-wavelength observations have provided further comparisons and allowed us to point out most relevant analogues. We summarize these comparisons and present new results related to polarimetric phase functions for the same samples and for various comets.