4 hours before the hour X - the comet continues to rapidly disintegrate

The comet is 3.6 million kilometers from the Sun's surface (4.3 million kilometers from its center). The rapid disintegration of the celestial body continues—the nucleus is rapidly shrinking, and as a result, the tail formed by the nucleus is thinning.

The volatiles (especially water ice) that held the rocky fragments of the cometary body together are now rapidly evaporating in the solar heat (the temperature on the Sun-facing side of the comet should now be around 1000°C). The nucleus is currently disintegrating into individual rocks surrounded by a cloud of water vapor and plasma.

If the comet has a solid central rocky core (at least a few hundred meters in size), it has a chance of surviving the remaining four hours. If not, once the ices evaporate en masse, the comet will collapse into a scattering of small rocky chunks. The smallest of these will be almost immediately converted into plasma by the Sun. The largest fragments will have a chance of falling onto the solar surface.