M.E. Prokhorov, & K.A. Postnov
Observations of a circumstellar disc around Be-star SS2883, the optical component to binary radiopulsar PSR B1259-63, that is tilted respective to the orbital plane, allows the immediate conclusion on the supernova explosion asymmetry in this binary system. The kick velocity acquired by a neutron star at birth lies within the range 50-500 km/s.