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We report BVR photometry of the V1343 Aql= SS 433 microquasar at differentphases of the 13-day orbital cycle for the 1986-1990 observing seasons. Thedata include five complete cycles of the 163$^{d}$ precession period of thesystem. We obtain mean light curves and color-color diagrams with the orbitalperiod for all intervals of precession phases. The optical component of theclose binary system (CBS) fills its critical Roche lobe and loses mass on thethermal relaxation time scale. Gaseous flow show up actively in the system andactivity manifestations differ substantially at different precession phases.

Optical Multicolor Observations of the SS 433=V 1343 Aql Microquasar