Origin and possible birthplace of the extreme runaway star HIP 60350

Using the recently determined spatial velocity components of the extreme ru naway star HIP 60350 and a gravitation potential model of the Galaxy, we in tegrate the orbit of HIP 60350 back to the plane of tile Galaxy. In this wa y, a possible location of tile formation of the stat, is determined. We est imate the uncertainty of the result due to the uncertainties of the gravita tional potential model and the errors in the spatial velocity components. T he place of birth lies (within the errors) near the position of the open cl uster NGC 3603. However, the ejection event which occurred about 29 Myr ago is in contradiction with the cluster mean age of 3-4 Myr. We suggest that it occurred at an earlier phase in sequential star formation in that region . We discuss also ejection mechanisms. Due to the rather high mass of the s tar (about 5 M-circle dot), the most probable model is that of dynamical ej ection.