Asteroid trace over Chelyabinsk, Russia, on 15 February 2013
8 May 2013
In February, a speeding asteroid slammed into our atmosphere and
exploded high over Russia’s Ural region, injuring hundreds and causing
millions of euros of damage. What should we do if we have a similar – or
even bigger – strike in the future?
Of the more than 600 000 known asteroids in our Solar System, almost 10
000 are classified as near-Earth objects, or NEOs, because their orbits
bring them relatively close to Earth’s path.
Dramatic proof that any of these can strike Earth came on 15 February,
when an unknown object thought to be 17–20 m in diameter arrived at 66
000 km/h and exploded high above Chelyabinsk, Russia, with 20–30 times
the energy of the Hiroshima atomic bomb.
The resulting shock wave caused widespread damage and injuries, making it the largest known natural object to have entered the atmosphere since the 1908 Tunguska event, which destroyed a remote forest area of Siberia.
The resulting shock wave caused widespread damage and injuries, making it the largest known natural object to have entered the atmosphere since the 1908 Tunguska event, which destroyed a remote forest area of Siberia.
“It’s important that we become aware of the current and future position
of NEOs, develop estimates on the likelihood of impacts and assess the
possible consequences,” says Detlef Koschny, Head of NEO activities in
the Agency’s Space Situational Awareness (SSA) Programme Office.
Artist's impression of asteroids passing Earth
“More importantly, we must consider whether and how warning, mitigation
and possible deflection actions can be taken. It’s important not only
for Europe, but for the rest of the planet, too.”
One aspect of ESA’s four-year-old effort requires the development of an
integrated system to scan the sky nightly for as-yet-undiscovered NEOs.
Another important element is studying how mitigation measures can be
applied in the case of smaller NEOs, and how to deflect any larger ones
that may seriously threaten our home planet.
This week, Deimos Space, an industrial partner working for ESA on SSA,
has invited top researchers from universities, research institutes,
national space agencies and industry in Europe and the USA to discuss
the state of the art in NEO impact effects and threat mitigation.
The meeting is taking place in Tres Cantos, Spain, near Madrid.
The meeting is taking place in Tres Cantos, Spain, near Madrid.
“A great deal of work remains to be done, for example, in computer
modelling of impact effects, how airbursts differ from ground strikes,
kinetic versus explosive deflection strategies and much more,” says
Gerhard Drolshagen, of the SSA Programme Office.
“The aim is to develop plans that will guide us in current and future NEO research and development.”
Ultimately, ESA aims to develop the capability to integrate European current and new assets such as automated telescopes into a coordinated and more efficient NEO system that can provide nightly sky surveys and advanced warning.
“With this, we can work with our partner agencies, scientists, industry and international bodies like the UN to offer firm options to national governments and political decision-makers,” says Nicolas Bobrinsky, Head of ESA’s SSA Programme.
“Events like the Chelyabinsk strike show that the NEO hazard is not just theoretical, and we need to invest in practical measures today to address tomorrow’s threats.”
Editor’s note: A summary of the workshop findings will be available as a downloadable PDF after 8 May.
“The aim is to develop plans that will guide us in current and future NEO research and development.”
Ultimately, ESA aims to develop the capability to integrate European current and new assets such as automated telescopes into a coordinated and more efficient NEO system that can provide nightly sky surveys and advanced warning.
“With this, we can work with our partner agencies, scientists, industry and international bodies like the UN to offer firm options to national governments and political decision-makers,” says Nicolas Bobrinsky, Head of ESA’s SSA Programme.
“Events like the Chelyabinsk strike show that the NEO hazard is not just theoretical, and we need to invest in practical measures today to address tomorrow’s threats.”
Editor’s note: A summary of the workshop findings will be available as a downloadable PDF after 8 May.
| ESA |
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| Guillermo Gonzalo Sánchez Achutegui |
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| ayabaca@gmail.com |
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| ayabaca@hotmail.com |
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| ayabaca@yahoo.com |
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