Update: Russian Meteor Was Even Bigger, Rarer Than First Estimated

By Corey S. Powell | February 15, 2013 4:01 pm

Reports are still coming in about the brilliant meteor (technically known as a bolide) that slammed into the atmosphere over Russia, causing injuries that sent hundreds of people to the hospital. In any breaking story like this, not all of the information is reliable and details keep getting updated as more facts come in. Here’s the latest.

Debris area of the meteor that struck the atmosphere over Chelyabinsk, Russia, at 3:20 UTC on February 15. (Credit: Google Earth, NASA/JPL-Caltech)

* No, it was not related to asteroid 2012 DA, which streaked close past the Earth earlier today. As strange as it sounds, the Russian event seems to have been coincidental. The observed path of the Russian bolide was totally different than the path of 2012 DA.

* The original mass of the rock that hit over Russia may be much larger than originally estimated. Calculations by astronomer Margaret Campbell-Brown at the University of Western Ontario in London, reported in the journal Nature, put its mass at 7,000 metric tons. At a density of 3 grams per cubic centimeter (typical of a stony meteorite), that means the parent body was about 15 meters (50 feet) wide. The total blast energy may have been the equivalent of 300 kilotons of TNT. These numbers are still rough estimates. Early reports pegged it as being much smaller, probably because the vast majority of the meteor disintegrated in the atmosphere.

* Most of the injuries and damage seem to have been caused by shock waves–sonic booms–from the meteor streaking through and breaking up in the atmosphere. Bits of it hit the ground, but they did not cause significant destruction, based on early reports. The bulk of the injuries seem to have come from shattered glass from broken windows.

* Just as scientists kept revising their estimate of the mass of the meteor, so they kept changing their estimates of how often objects of similar size strike our planet. Early news stories stated that similar bolides occur a few times a year. Others stated once every decade. Now Nature is reporting that this was the largest meteor strike since the Tunguska event of 1908.

* At present, we have no way to detect meteors this size before they reach the Earth. But Deep Space Industries, one of the private companies angling to build a fleet that could monitor asteroids and ultimately mine them for resources, is eager to change that. Planetary Resources, a competing company, has made a similar pitch. And you can help collect statistics by keeping a watch on meteor events from the ground (the American Meteor Society offers some tips).

  • Buddy199

    Amazing that it was caught on a dash cam.

    • http://oahutrading.blogspot.com/ steveo77

      LOTS of dash cams!

    • Pat Kohler

      Russia has a problem with insurance fraud. This has led to the use of dash cams in a lot of cars. Check out YouTube for some. A good start is a plane crash.

      • LironaK

        CCTVs for security seem to be up everywhere, and some of those caught some amazing footage of doors & windows being blown in by the shock wave.
        I know a couple of people that have put them in their cars, so if anyone pulls any crap, it’s on camera.
        With people accusing each other of stuff & when lies go to court & are accepted as truth, it’s not a wonder we aren’t all running around with helmet cams on 24/7. Sad when it’s gotten to that point. I know when people assemble to strike or protest something, most of them have cameras rolling , many cameras.
        Insurance companies trying to rip people off is another reason some have installed cameras around their homes, businesses & in their cars. Transit services use them as well.
        It’s great for something like this, as it can help scientists, but a sad commentary on humanity.

  • LironaK

    Has there been any analysis to see what this thing is made of? Any life signs? Surveyor 3 had bacteria that survived 31 months on the moon. Some scientists in Costa Rica found roughly 20 million year old bacteria inside bees in amber that went dormant. When supplied with the right environment, they resumed life. Sure, the outside of that thing was burning hot, but what about inside? It certainly makes one wonder! Any what about all those satellites & space junk we have up in the sky? The rovers on Mars?

    Before you scoff, remember many scientists believe that is how we got our beginnings here.

    Youtube has a lot of video of this thing coming down. Any recovery data yet? I’d love to know what it’s made of & where it came from at least.

    It makes one wonder if we’ve really “eradicated” ANY pathogenic virus, bacteria or fungus, or if our efforts simply made them go dormant?

    Even though these meteorites took different trajectories, depending on where they came from, passing different planets, stars, etc can cause them to change directions. When you really look at all these things, they are all interconnected, it’s just a matter of degree.

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About Corey S. Powell

Corey S. Powell is DISCOVER's Editor at Large and former Editor in Chief. Previously he has sat on the board of editors of Scientific American, taught science journalism at NYU, and been fired from NASA. Corey is the author of "20 Ways the World Could End," one of the first doomsday manuals, and "God in the Equation," an examination of the spiritual impulse in modern cosmology. He lives in Brooklyn, under nearly starless skies.

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