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Abstract: Using 8m-10m class telescopes and their Adaptive Optics AO systems, weconducted a long-term adaptive optics campaign initiated in 2003 focusing onfour binary asteroid systems: 130 Elektra, 283 Emma, 379 Huenna, and3749 Balam. The analysis of these data confirms the presence of theirasteroidal satellite. We did not detect any additional satellite around thesesystems even though we have the capability of detecting a loosely-boundfragment located at 1-4 x RHill ~40 times smaller in diameter than theprimary. The orbits derived for their satellites display significanteccentricity, ranging from 0.1 to 0.9, suggesting a different origin. Based onAO size estimate, we show that 130 Elektra and 283 Emma, G-type and P-typeasteroids respectively, have a significant porosity 30-60% considering CI-COmeteorites as analogs and their satellite-s eccentricities e~0.1 arepossibly due to excitation by tidal effects. 379 Huenna and 3749 Balam, twoloosely bound binary systems, are most likely formed by mutual capture. 3749Balam-s possible high bulk density is similar to 433 Eros, another S-typeasteroid, and should be poorly fractured as well. 379 Huenna seems to displayboth characteristics: the moonlet orbits far away from the primary in term ofstability 20% x RHill, but the primary-s porosity is significant 30-60%.

Autor: F. Marchis, P. Descamps, J. Berthier, D. hestroffer, F. vachier, M. Baek, A. Harris, D. Nesvorny


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