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May 28, 2022

Coronavirus / Russia-Ukraine

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Here's what scholars understand from the simulated impact of an asteroid

Last week, space agencies simulated the impact of an asteroid to figure out what response to organize. Here's how it went.

Gianluca Ricciodi Gianluca Riccio
in Spazio
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Artist's impression of ESA's Hera mission, a small spacecraft that aims to investigate whether an asteroid headed for Earth could be deflected. ESA

Artist's impression of ESA's Hera mission, a small spacecraft that aims to investigate whether an asteroid headed for Earth could be deflected. ESA

May 3, 2021
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This week, as you will know if you read about it here or around, space agencies around the world have come together to figure out how to respond to the eventuality that a large asteroid hits Earth. 

As part of the Planetary Defense Conference, experts spent several days planning their response. At what? Well, to an imaginary scenario born from the impact of an asteroid with Europe. An asteroid capable of destroying an area about 100 kilometers (60 miles) large.

Impact simulation (find the full report here)

Impact
Here are the very first data on the impact of the asteroid called 2021 PDC. Orbit, date of discovery, date of possible impact. It all started from here.

The simulated impact asteroid had a diameter between 35 and 700 meters and was detected by the Pan-STARRS survey and subsequently monitored by the International Asteroid Warning Network. 

One of the challenges of potentially dangerous asteroids is that there may be limited information about their size and exact path. Observing an incoming asteroid of this type would involve a lot of uncertainty: it could take months before space agencies can be sure of an impact on Earth, and the location of this impact.

The options available to deflect an approaching asteroid to Earth could involve minor adjustments to its path to move it away from the planet, but only if there was sufficient warning. In the scenario considered in this case, there would not be enough time to deflect the impact. The simulated asteroid has "hit" an area of ​​the Czech Republic close to the border with Germany.

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Emergency management: what emerged

Impact
The impact area (I took the liberty of marking it with a marker)

To understand how to handle such a situation, the researchers looked at the management of natural disasters such as hurricanes, floods and earthquakes. To say, a question to consider in such an asteroid impact scenario is not just how to conduct an emergency response in a large city, but also in more isolated rural areas.

Another topic was the need for ongoing long-term planning and preparation, and not just thinking about the months or year ahead. "A big lesson was that we need longer-term planning on how to locate, track and ultimately mitigate potentially dangerous asteroids," he says. Detlef Koschny, head of ESA's Office for Planetary Defense in one declaration . 

Simply thinking about annual or biennial planning cycles, i.e. the budgets currently set at public institutions, is not enough to deal with a risk that has been created for hundreds of millions of years.

How to blame the researchers? We are not ready for such a thing. And, how to say, even if remote the risk must be prepared, to avoid falling (yes, we too, not only the asteroid) from the clouds.

tags: European space agencyasteroids
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