Planetary perturbations for Oort Cloud comets. I. Distributions and dynamics

► An extensive study of planetary perturbations on Oort Cloud comets is performed. ► The probability for a comet to be ejected from the Oort spike is computed. ► This probability is not a step function from which the loss cone concept derives. ► The long term behaviour under planetary perturbations alone is also performed. ► Some inferences about the production of Halley type comets or Centaurs are made.