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(4) Vesta and (9) Metis are large main-belt asteroids with high albedos. Withmillimetre-observations at 93.0 and 95.5 GHz we characterised the emissionproperties of the surface material. The coverage of the full rotation periodallowed a detailed study of the heterogeneity of the surface. The rotationallyaveraged fluxes are explained very well by our thermophysical model techniqueswhen using an emissivity in the mm-range of about 0.6 for (4) Vesta and about0.7 for (9) Metis. The mm-lightcurves follow for a large fraction of therotation period the shape-introduced variations. The rotational phases withclear deviations are connected to structures which are visible in the HSTimages of (4) Vesta and the Keck AO-images of (9) Metis. The observedlightcurve amplitudes are peak-to-peak ~30% for (4) Vesta and ~25% for (9)Metis, while the shape-related amplitudes are only 5 and 4%, respectively. Theemissivities at mm-wavelengths are lower than in the far-IR, confirming thatparticles with sizes of about 100 mikron influence the mm-behaviour. The 3-mmobservations are very powerful for the study of asteroid surfaceheterogeneities.

3.2 mm lightcurve observations of (4) Vesta and (9) Metis with the Australia Telescope Compact Array