  Using the data obtained previously from Fabry-Perot interferometry, we study
the orbital characteristics of the interacting pair of galaxies KPG 302 with
the aim to estimate a possible interaction history, the conditions necessary
for the spiral arms formation and initial satellite mass. We found by
performing N-body/SPH simulations of the interaction that a single passage can
produce a grand design spiral pattern in less than 1 Gyr. Althought we
reproduce most of the features with the single passage, the required satellite
to host mass ratio should be 1:5, which is not confirmed with the dynamical
mass estimate made from the measured rotation curve. We conclude that a more
realistic interaction scenario would require several passages in order to
explain the mass ratio discrepancy.
