The complete characterisation of the Tunguska event of 30th June 1908 is still a challenge for astrophysicists. We studied the huge amount of scientific literature to select data directly available from measurements and we introduced parameters calculated by the application of models, and evaluated other possibilities. We then selected a range of meaningful atmospheric trajectories, from which we extracted a set of possible orbits. We obtained 886 orbits, which were used to estimate the probabilities of the possible origin of the Tunguska Cosmic Body (TCB). We found that the probability that the TCB moved on an asteroidal path is higher than it moved on a cometary one, 83% to 17%, respectively.