Аннотация:The area of possible parameter values of A0620-00 = V616 Mon in the model of a tidally distorted K-star with partial eclipse by the outer dark part of the accretion disk has been obtained. The main conclusions are: the 2$^nd$ component has the mass 3 M_sun; \le M$_x$ \le 5.3 M_sun;, which confirms the possible existence of a black hole in this system; the radius of the accretion disk R$_d$ is variable, the disk often almost fills the Roche lobe. The system inclination is 75\deg \le i \le 83\deg.