0620029

We propose to conduct extbf{fixed-time} uninterrupted observations (163+235=398 ks) of the galactic microquasar SS433 in the primary orbital eclipse immediately after the face-on disk precessional phase of the source in September 2008}. The main goal is to obtain hard X-ray spectroscopy of the egress from the primary orbital eclipse and to study its highly variable form. The phase-resolved spectroscopy is crucial to study the structure and physical parameters of a 20 keV rarefied corona at the center of the supercritical accretion disk in SS433 discoverd in previous INTEGRAL observations. The form of the eclipse is also needed to constrain binary mass ratio in this system which is still controversial. The proposal is not associated with the AO-6 Key Programs. [truncated! Please see actual data for full text]