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The Bennu pattern return mission was a boon to many branches of science

June 14, 2024
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The Bennu pattern return mission was a boon to many branches of science
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Collecting the OSIRIS-REx sample return capsule. Credit: NASA/Keegan Barber, CC BY.

Gathering the OSIRIS-REx pattern return capsule. Credit score: NASA/Keegan Barber, CC BY.

Earth is continually bombarded by fragments of rock and ice, also called meteoroids, from outer house. Many of the meteoroids are as tiny as grains of sand and small pebbles, they usually utterly dissipate excessive within the environment. You may see meteoroids bigger than a couple of golf ball after they gentle up as meteors or shooting stars on a darkish, clear evening.

Whereas very small meteoroids are widespread, bigger ones – larger than a dishwasher – will not be.

Meteoroids are troublesome objects for aerospace and geophysics researchers like us to check, as a result of we are able to’t normally predict when and the place they are going to hit the environment. However on very uncommon events, we are able to research synthetic objects that enter the environment very like a meteoroid would.

These objects come from house missions designed to move bodily extraterrestrial samples from outer house to Earth. Due to this similarity to meteoroids in entry, we frequently refer to those pattern return capsules, or SRCs, as “synthetic meteors.”

Over 80 researchers from greater than a dozen establishments lately labored collectively to check such an “synthetic meteor” – NASA’s OSIRIS-REx sample return capsule – because it reentered Earth’s environment.

These establishments included Sandia National Laboratories, NASA’s Jet Propulsion Laboratory, Los Alamos National Laboratory, the Defense Threat Reduction Agency, TDA Research Inc., the University of Hawaii, the Air Force Research Laboratory, the Atomic Weapons Establishment Blacknest, Boise State University, Idaho National Laboratory, Johns Hopkins University, Kochi University of Technology, Nevada National Security Site, Southern Methodist University, the University of Memphis and Oklahoma State University.

This pattern return offered our groups with a novel alternative to measure the sound waves and different phenomena that objects from house produce as they velocity by means of the Earth’s environment.

To seize alerts, we put in many delicate microphones and different devices in key places near the SRC’s flight path.

Whereas house companies and personal corporations launch objects into house on a regular basis, the OSIRIS-REx SRC is one in all solely a handful of objects to return to Earth from interplanetary house because the finish of the Apollo missions. Solely these objects can obtain the velocity of pure meteoroids, making their reentry valuable for learning the properties of pure objects.

Sampling an asteroid

NASA launched the Origins, Spectral Interpretation, Useful resource Identification, Safety, Regolith Explorer, or OSIRIS-REx, mission on Sept. 8, 2016. It traveled to Bennu, a near-Earth asteroid, and picked up a pattern from its floor in October of 2020.

Associated: NASA’s asteroid Bennu samples have rocks not like any meteorite ever discovered

The pattern returned to Earth within the early morning of Sept. 24, 2023, in a pattern return capsule. The SRC reentered Earth’s environment over the Pacific Ocean at a velocity of over 27,000 mph (43,500 kph) and landed in Utah only some minutes later.

SRCs produce a shock wave as they plunge deep into the environment, akin to the sonic growth generated by a supersonic jet breaking the sound barrier. The shock wave then loses power till all that continues to be is low frequency sound, called infrasound.

Whereas people can’t hear infrasound, delicate scientific devices can detect it, even at nice distances. A few of these devices sit on the bottom, whereas others are suspended within the air from balloons.

Observing the Bennu SRC

The Bennu sample return capsule. Credit: Keegan Barber/NASA via AP.
The Bennu pattern return capsule. Credit score: Keegan Barber/NASA by way of AP.

Our groups of scientists jumped on the SRC reentry as a possibility to study extra about meteors. One of many groups, led by Siddharth Krishnamoorthy at NASA’s Jet Propulsion Laboratory, used the SRC reentry to check infrasound-detecting balloons that might later be used on the planet Venus.

One other crew, led by one in all us – Elizabeth Silber – and Danny Bowman at Sandia Nationwide Labs used the SRC to higher perceive how we are able to use sound to [gather information about meteoroids].

Researchers from many establishments throughout the nation participated in these observational campaigns.

Our groups strategically positioned devices in places throughout a 300-mile (482 km) distance spanning from Eureka, Nevada, to shut to the touchdown website in Utah. The devices ranged from high-tech customized sensors to smartphones on the bottom across the SRC’s flight path and touchdown website. They monitored the low frequency sound waves from the SRC’s reentry.

Along with the ground-based sensors, our researchers connected devices to balloons that floated at twice the altitude of business planes through the SRC reentry. The sensors connected to those balloons recorded the sound waves produced by the SRC’s shock wave. These sound waves carried details about the SRC, its motion and the surroundings it handed by means of.

The balloon groups needed to time the balloons fastidiously to ensure they’d be on the proper place when the SRC handed. Workforce members from NASA’s Jet Propulsion Laboratory, Oklahoma State University and Sandia National Laboratories launched a number of completely different sorts of balloons earlier than daybreak from Eureka, Nevada.

Researchers from OSU, Sandia and the University of Hawaii additionally deployed floor infrasound sensors nearer to the SRC’s touchdown location, alongside the Utah-Nevada border and at Wendover Airport. Whereas the SRC was already slowing down and Wendover Airport was about thrice farther from the flight path than the Eureka deployment, we detected a transparent infrasound sign at this website as properly.

Researchers on these groups at the moment are analyzing the information to establish the factors alongside the trajectory the place devices recorded the SRC reentry alerts. As a result of the SRC’s flight path spanned roughly 300 miles (482 km), the researchers want to determine the origin factors of the alerts because the completely different sensors detected them.

This was the most-instrumented hypersonic reentry in history.

This analysis will assist our groups work out what patterns the low-frequency sound waves propagated by means of the environment and the place the shock wave was at its peak depth.

Whereas our groups are nonetheless analyzing the information, the preliminary outcomes present our devices captured plenty of alerts that may assist future analysis use low-frequency sound waves to check meteors.

And gaining insights into intricacies about how low-frequency sound waves journey by means of the environment may help researchers use infrasound to detect hazards on Earth, such as tornadoes and avalanches.


This text first appeared on The Conversation. It’s republished right here underneath a Artistic Commons license.



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