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We report the results of two multi-chord stellar occultations by the dwarfplanet (1) Ceres that were observed from Brazil on 2010 August 17, and from theUSA on 2013 October 25. Four positive detections were obtained for the 2010occultation, and nine for the 2013 occultation. Elliptical models were adjustedto the observed chords to obtain Ceres' size and shape. Two limb fittingsolutions were studied for each event. The first one is a nominal solution withan indeterminate polar aspect angle. The second one was constrained by the polecoordinates as given by Drummond et al. Assuming a Maclaurin spheroid, wedetermine an equatorial diameter of 972 $\pm$ 6 km and an apparent oblatenessof 0.08 $\pm$ 0.03 as our best solution. These results are compared to allavailable size and shape determinations for Ceres made so far, and shall beconfirmed by the NASA's Dawn space mission.

Results of two multi-chord stellar occultations by dwarf planet (1) Ceres