Luna-2 before impact... just several seconds... In real it occurred 1959, 13 December, 21:02:24 UTC... In Celestia it occurred 1959, 13 December, 21:02:05 UTC... about impact place... in real it impacted the Moon's surface east of Mare Imbrium with coordinates 29,1 degrees North latitude - 0 degrees East longitude... In Celestia it place with latitude about 29 degrees but longitude is about 26 degrees...
what I can say... without NO historical data about orbital parameters after launch it too hard to solve this problem... AND... I use SPICE kernels (from NASA) for making trajectories, so it brings some difference when I use these trajectories in Celestia... but anyway I reached Mare Imbrium too...
Added after 3 minutes 45 seconds:maybe with time I will make more correct trajectory...