Title:Survey of Binary Asteroid with Spitzer/IRS
Author:Franck Marchis, U. Calif. Berkeley and Paris Observatory

We obtained telescope time with the SPITZER/IRS capabilities to better estimate the fundamental properties of binary asteroid systems. Spectra between 5 and 42 microns are being recorded for 26 selected targets, allowing us to better refine their size, albedo, and eventually bulk-density. The emissivity spectra of these minor bodies can be also used to better estimate their surface composition and mineralogy. We will present the preliminary analysis of the data collected for this program, emphasizing the results we obtained for asynchronous binary asteroid systems.