The reason for the horizontal turn of the Tunguska–1908 bolide trajectory remains difficult to understand. It finds explanation, however, in the New Explosive Cosmogony of minor bodies as having been caused by an explosion of a part (Μ up to 10¹² g) of the comet nucleus whose ices contained products of their electrolysis, 2H₂ + O₂. In detonation, this part was repelled from the more massive unexploded nucleus remnant, changed the direction of its own motion by ~10^° and imparted its kinetic energy, in expanding and slowing down, to the air in producing an effect of a high-altitude explosion. On passing through the Earth's atmosphere, the unexploded remnant again entered a heliocentric orbit (the Vernadskiy's hypothesis, 1932). A search for this comet, P/Tunguska–1908, among the 6077 known NEAs shows the 2005 NB56 object to be the most appropriate candidate for a number of its parameters (its size is ≈ 170 m, P = 2.106 y, e = 0.473 and i = 6.8^°). Back integration of its orbit without allowing for non-gravitational effects suggests that it had passed the Earth on June 27, 1908 at a distance of 0.0659 AU. It is quite possible that a proper inclusion of even fairly weak non-gravitational forces might make its orbit consistent with parameters of the Tunguska bolide.