"The small asteroid will enter the Earth's atmosphere on April 19 on April 29," said a fictional statement, "producing a big fire ball … and it is anticipated that it would release 5-20 megat of energy."
That's about 20,000 times more than the bomb dropped on Hiroshima in the Second World War.
On the last day of the conference, participants discussed "financial, economical and human impact effects on a large, densely populated area such as New York City", according to NASA.
"Bringing together the disaster control community and the scientific community is vital to prepare for the potential impact of possible asbestos in the future," said Leviticus Lewis of the Response Operations Division for FEMA.
In a legal debate on the last day, supposedly it was decided that the United States would be financially and legally liable for the damage, after that the country that launched the failed dismissal.
"This exercise is valuable as it continues with the work currently underway to identify key questions and issues for this low likelihood scenario but high results."
"This exercise will help us develop more effective communication with each other and with our governments," said Lindley Johnson, NASA's planetary defense officer last week.
Previous drills at the IAA Planetary Defense Conferences have seen Dhaka and the French Riviera destroyed. In 2017 Tokyo was saved.
At the next simulation – the 2021 conference in Vienna – it is expected that a European target will be in the firing line.