That would be what, 2400 miles?
I don’t know, but I been told the moon is on average about 238K miles out there.
I think they should nudge Apophie to hit the Moon so we can study the impact, maybe mine the debris and worry no more about it.
As for the size and mass of Apophis, there's no real ambiguity about it. The object is estimated to be about 885 feet across (a hair smaller than the Eiffel Tower) and has a mass of 2.1 x 10 to the tenth power kg, according to Universe Today. If those figures are meaningless to you, here's a real-world example of what it all means: The asteroid that created Arizona's Meteor Crater (seen above) is believed to have exploded with the force between three and 10 megatons of energy. Should Apophis strike, it would likely deliver the equivalent of 880 megatons of energy. By comparison, the atomic bomb dropped on Hiroshima only released about 0.15 megatons of energy, according to Britannica.
According to Universe Today, wherever the asteroid hits (assuming it hits land), it's going to flatten thousands of square miles of land. If it hits a major city, like London, it's going to level the area, killing millions of people in the process.
If you think all of that sounds a bit hyperbolic, consider what happened to Hiroshima and Nagasaki. In both cases, a nuclear bomb delivering a fraction of the energy Apophis would likely release exploded over the cities, and about 200,000 people died as a result (according to Newsweek). Apophis would deliver significantly more magnitude of energy than either of the Hiroshima or Nagasaki weapons.
Fortunately, the odds of it hitting a populated area are small. In fact, the odds of it hitting land are small, considering that oceans cover about 75% of the Earth's surface. So statistically speaking, it's most likely that Apophis would land in the ocean.
Read More: https://www.grunge.com/611337/heres-what-would-happen-if-apophis-hit-earth/
25,000