Low-frequency radio waves can reveal the intent and interiors of an asteroid.
Created: Dec 26, 2022 10:16 AM EST
A 500-foot-wide asteroid called 2010 XC15 will pass by Earth on December 27. While it has no intention of hitting us, it’s us who will hit the asteroid with a radio pulse.
Scientists at the University of Alaska Fairbanks (UAF) and NASA want to examine the 2010 XC15 space rock to test their preparation against Apophis. This dangerous asteroid might hit our planet in 2029. It is believed that on April 13, 2029, Apophis will be 10 times closer to Earth than the moon.
The researchers will use the HAARP (High-frequency Active Auroral Research Program) array to shoot 9.6 megahertz radio waves at the 2010 XC15 asteroid. HAARP is a government-funded research program that generally studies the ionosphere (part of Earth’s atmosphere at 50 to 400 miles above the surface).
However, this will be the first time it will be employed to examine an asteroid.
HAARP will dig deep into the asteroid
Astronomers have been shooting radio waves in space to spot asteroids; figure out their shape, trajectory, structure of their surface, and many other characteristics. For this purpose, they use radio waves having frequency ranges either in the S-band (2,000 to 4,000 MHz) or X-band (8,000 to 12,000 MHz).
Interestingly, for probing 2010 XC15, the researchers are using waves of much lower frequency (9.6 MHz) and longer wavelengths because, this time, they don’t just want to explore the surface of the asteroid. They want to know what’s inside.
Information about the interiors could reveal important details about the damage that an asteroid could cause and help scientists figure out an effective counter-strategy.
Explaining this further, the lead researcher and engineer at NASA, Mark Haynes, said, “What’s new and what we are trying to do is probe asteroid interiors with long wavelength radars and radio telescopes from the ground. Longer wavelengths can penetrate the interior of an object.”
He further added, “If you know the distribution of mass, you can make an impactor more effective because you’ll know where to hit the asteroid a little better.”
All eyes on HAARP and 2010 XC15
On December 27, the distance between 2010 XC15 and Earth will be around twice the distance between Earth and the moon. HAARP will be shooting 9.6 million chirping radio waves every second to this distance, and this process will be repeated every two seconds.
This test is crucial because if the researchers can successfully examine 2010 XC15 using low-frequency radio waves at such a long distance. Then they could easily employ the same method to analyze Apophis.
Although the 2029 asteroid is most likely to miss Earth, in case it doesn’t, the consequences could be catastrophic. For instance, in response to an FAQ that explores the possibility of Apophis hitting Earth, The Planetary Society wrote on its website, “Apophis would cause widespread destruction up to several hundred kilometers from its impact site. The energy released would be equal to more than 1,000 megatons of TNT, or tens to hundreds of nuclear weapons.” Moreover, Apophis is just one asteroid. There will be many asteroids that will pass by, or might even hit, Earth in the future. Low-frequency radio waves could play a key role in understanding the composition of these mysterious space objects and, at the same time, help us strengthen our planetary defense mechanism.
However, before all this happens, HAARP and its low-frequency radio waves will have to pass their first test, due on December 27.
You can read the original news release from UAF here.
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