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1. University of California at Berkeley, Department of Astronomy, 601 Campbell Hall, Berkeley CA 94720, USA
2. Institut de Mecanique Celeste et Calcul d'Ephemerides, Obs. de Paris, 77 Av. Denfert-Rochereau, 75014 Paris, France

This web page will be updated regularly.

This web page describes the analysis of several known binary asteroid observations, leading to the determination of their orbital elements, using mostly the Adaptive Optics (AO) system available on the VLT-8m telescope (NACO) and on the Keck-10m telescope. Additional AO data from Lick and Palomar may have been used to better characterize the orbit of some of them.
Because new observations may be taken, we will refine these orbits regularly. Two algorithms developed and fully tested recently by Descamps (2005) and Hestroffer et al., (2005) are used to perform this work. The orbits of several asteroids and their implication for the origin of the system were presented and discussed in several articles and conferences (seereferences).

The orbits of the companion of the following asteroids are now available:

• 617 Patroclus ( - based onKeck LGS AO & Gemini Archive data)
• 22 Kalliope and Linus
• 45 Eugenia and Petit-Prince
• 87 Sylvia
• 90 Antiope A & B
• 107 Camilla
• 121 Hermione
• 130 Elektra
• 283 Emma
• 379 Huenna
• 3749 Balam
• and so on...