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NASA is looking into strategies to safeguard spacecraft, including theInternational Space Station and the Hubble Space Telescope, from possible dings from the meteor shower. Meanwhile, scientists in the United States and Germany have been experimenting with hypervelocity impacts in order to simulate what kind of damage could occur from meteoroid strikes.

Just what kind of light show the Draconids may present for skywatchers on Oct. 8-9 2015 when the meteor shower peaks, is hard to predict. But meteoroid experts hold varying views as to the intensity of this year’s go-round with the Draconids. [Related: October’s Draconid Meteor Shower May Impress]


Some forecasters say it could be a strong shower, maybe even a meteor storm of up to 1,000 shooting stars an hour at its peak.

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It is known that spacecraft are routinely peppered by meteoroids and orbital debris. Impacts that result in mechanical damage have been well-characterized. But the electrical effects of hypervelocity impacts are still relatively vague.

Testing at ground-based accelerators has confirmed that hypervelocity impacts generate plasma. This expanding plasma can create radio frequency emission that, in some cases, may play havoc with a satellite’s sensitive electronic innards. The result of that electrical effect can range from a spurious signal input to total loss of the spacecraft.

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Hypervelocity meteroids

A leading expert in this research is Sigrid Close, an assistant professor of aeronautics and astronautics at  Stanford University in California. For Close and her research colleagues, the question is whether a hypervelocity particle — either a piece of space debris or a meteoroid — that hits a spacecraft but is too small to penetrate, can still cause an anomaly or failure through electrical means.1

Working with the Max Planck Institute in Heidelberg, Germany, the researchers recently shot small particles at various types of spacecraft material placed inside a vacuum chamber. Plasma sensors, optical sensors and radio frequency sensors were installed within the Institute’s equipment to measure the upshot.

The experiment was designed to look for that electrical anomaly.

“We think we’ve found it,” Close told Charge and plasma production, as well as radio frequency, were confirmed from the particle impacts, she added.

Close said that the radio frequency appears to be very strongly dependent on speed and therefore most relevant to meteoroids, which travel almost an order of magnitude faster than space debris.

“We’re currently writing a journal paper describing these results,” she added.

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1Draconid meteors appear to radiate from Draco constellation in the northern evening sky. Credit: Starry Night Software

Dangerous cosmic commodity

Given all the attention that space debris of our own making receives, Close flags the fact that meteoroids are also a dangerous cosmic commodity.

The roster of spacecraft most likely lost due to electrical glitches associated with meteoroid impact includes the European Space Agency’s Olympus telecommunications satellite, which suffered a loss of gyroscope stability during the Perseid meteor shower in 1993. [Photos: Amazing Perseid Meteor Shower Displays]


In addition, the Landsat 5 satellite lost gyro stability during the peak of the Perseid shower in 2009, similar to the Olympus failure and suggestive of a meteoroid-induced electrical effect.

Numerous other satellite anomalies have been loosely associated with hypervelocity impacts, but no definitive cause has been established, Close said.

Emerging story

“Human-made debris is something that we’ve caused and we’re responsible for,” Close said. “If it hasn’t decayed, it’s in orbit and it’s a threat that we can track and hopefully mitigate. It’s our duty to make sure that it does not hurt or damage anything because we put it there.”

Meteoroids, on the other hand, are naturally occurring and can’t be tracked per se. Meteoroids not found in streams are termed sporadic meteors.


“If we see a meteor or a shooting star, it’s already burned up and won’t be coming back to threaten us. Of course, we monitor the parent comet or asteroid that created the shower, but we can’t remove the parent comet or asteroid … nor should we,” Close said.

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There’s also a general belief that meteoroids do little or no damage to satellites, Close noted, yet meteoroids have caused more anomalies than space debris on orbit. Specifically, the Olympus and Landsat 5 incidents and linkage to the electrical phenomenon that Close and her team are chasing.

“We don’t know all of the details yet, but a story is starting to emerge that very fast particles, even if they are smaller than a microgram, can cause huge issues for satellites,” Close said.

Meteoroid speed trap

In regards to the upcoming Draconids, how much of a fear factor should they hold for satellite operators? Will they pack a punch?

“The Draconids move slowly,” said William Cooke of the Meteoroid Environment Office at NASA’s Marshall Space Flight Center in Huntsville, Ala. Their speed is roughly 12 miles (20 kilometers) per second, “which is the same speed as the sporadic background, so the chances of an electrical upset are almost nil,” he told


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Cooke said that, unlike the Perseids and Leonids, which are showers with very fast meteoroids, he has never heard of an electrical issue correlated with the Draconid stream.

“The rates in the past, especially in 1985, were certainly high enough, but there was nada,” Cooke said. “So the main concern with the ‘Dracs’ is impact damage or attitude displacements.”


NASA astronaut Ron Garan took this photograph during the Perseid meteor shower on Aug. 13, from the International Space Station.

Unexplained anomalies

Still to be studied, however, is just how fast a meteoroid needs to be moving to be trouble for a satellite controller.

“I would say that there are many unexplained anomalies on orbit that are loosely associated with plasma or electrostatic discharges that may be caused by meteoroid impacts,” Close said.


Still to be determined is where the cut-off is — in terms of a meteoroid’s velocity — and its potential for triggering an electrical hiccup within a satellite, Close added. “But nobody knows for sure because the research has not been done.”

Close was a member of a 13-person blue-ribbon group that recently produced the report, “Limiting Future Collision Risk to Spacecraft: An Assessment of NASA’s Meteoroid and Orbital Debris Programs.” She and Peter Brown, a professor of astronomy at the University of Western Ontario, wrote the section on meteoroids.

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The full committee report recommended that a baseline effort should be established to evaluate the NASA Meteoroid Environment Model and flush out major uncertainties.


“I think we should pay more attention to this issue,” said Diego Janches of the Space Weather Lab at NASA’s Goddard Space Flight Center in Greenbelt, Md. He said research indicates this can be a serious issue — at least as serious as mechanical damage caused by impacts.

“Over a decade ago, we started using high power and large aperture radars to study small meteors. These studies have provided enough information indicating that velocity distributions are not as simple and as slow as previously believed,” Janches told It’s extremely important to include new results to understand “how serious the threats caused by impacts of these smaller particles can be to the health of our space missions.”1

Stanford University’s proposed MEDUSSA (Meteoroid, Energetics, and Debris Understanding for Space Situational Awareness) CubeSat. It would delve into spacecraft-damaging strikes by meteoroids.

CubeSat proposal

While ground-based research is under way, the Stanford group is also looking at a space-based research tool.

The Meteoroid, Energetics and Debris Understanding for Space Situational Awareness satellite is long-hand for MEDUSSA. This diminutive CubeSatwould dig into the issue about probable loss of spacecraft due to electrical damage from meteoroids.

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Once in Earth orbit, MEDUSSA would deploy a meteor screen that should see nearly one impact event per hour. Impacts on the meteor screen will be detected and localized using an optical camera. The CubeSat is also geared to characterize the effects of impacts from meteoroids and from energetic particles.

MEDUSSA is not yet funded, but the Stanford group is working with agencies to move the project forward, Close said.





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