Trajectory projections are made as more and more data come in, but, not to worry, the odds are still millions to one. The odds are now thousands to one against impact. All over the globe pieces of Hamner-Brown fall on land and in water. The coasts are wiped clean by mile-high tidal waves. What was not destroyed in the first few hours is now victim to fire, flood, chaotic weather, and massive earthquakes as the planet's fault lines give way.
Civilization lies in ruin.
But not all of what's left of Mankind is particularly civilized. Lucifer's Hammer is simply the best book of its kind that I have ever read. When asked for description, scientists have quoted from it. Then see the movies and watch the skies knowing you've done your homework. Oh, and about that asteroid.