That meteor from January left behind clues to help scientists find more like it



When a bright ball of light streaked across the night sky over Detroit in January, many residents were thankful just to have witnessed something so spellbinding.

“I survived the Michigan meteor of 2018. Thank you for your support during these difficult and scary times,” read one tweet liked over 1,000 times.

The Michigan meteor even earned the enviable distinction conferred upon all sorts of freak occurrences these days: its own twitter handle.

But the legacy of the meteor heard around the world (or at least in southeastern Michigan) was more than just a Twitter footprint; it was also a trove of data that scientists now say can be used to better understand objects that pass through the Earth’s atmosphere. Infrasonic microphones and seismometers which happened to capture the meteor explosion gave scientists the rare opportunity to compare that data with more routine satellite and ground camera images.

In a report in Seismological Research Letters, a team of scientists led by Michael Hedlin of the Scripps Institution of Oceanography use the data to pinpoint the location, height, and time of the Detroit bolide explosion and the amount of energy it released. Bolides are extremely bright meteors that explode in the atmosphere.

According to Hedlin, although bolides are uncommon, it is even more rare for one to happen in a densely populated area like Detroit.

“The one we saw over Michigan was pretty striking because it happened in a populated area where there were monitors, sensors, and a lot of people observing from the ground,” Hedlin tells Metro Times.

The last bolide to happen over a similarly well-instrumented area was in Chelyabinsk, Russia, in February 2013. Aided by the ubiquity of dashcams in Russian cars, that bolide also went viral in a matter of hours.

But in comparison to the bolide in Russia, which was of such magnitude that it can only be expected once every few decades, the Detroit bolide can help researchers learn the smallest events their instruments can detect. Hedlin and his team estimate that the Detroit bolide could help them detect about 15 events with this size bolide or larger this year.

According to Hedlin, the Detroit bolide analysis even helps in locating clandestine nuclear tests, as atmospheric explosions like the bolide explosion “serve as proxies for nuclear tests.”

Lucas Maiman is a Metro Times fall editorial intern.

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