Posted on 02/17/2013 1:01:22 AM PST by neverdem
Current and planned efforts focus on larger objects
Scientists have begun piecing together the characteristics of the meteor that exploded over Russia on the morning of February 15, using data from seismic instruments that track earthquakes and microphones designed to detect sonic booms from nuclear explosions. Unlike the asteroid DA14, which narrowly but predictably missed Earth later that day, the meteor was too small to detect before its contrail appeared in the dawn skies over the Russian city of Chelyabinsk.
Yet even an object too small to detect can produce an impressive amount of destruction. The meteor was 15 meters across (compared with 50 meters for 2012 DA14) and weighed more than 7,000 metric tons when it entered Earth’s atmosphere, says Margaret Campbell-Brown, an astronomer at Western University in London, Ontario. She estimates that it was streaking through the sky at supersonic speeds of about 18 kilometers a second before exploding at an altitude of 15 to 20 kilometers, creating a shock wave that shattered glass in a deafening boom once it reached the surface. Various news sources have reported hundreds of buildings damaged and about 1,200 injuries.
Coincidentally, the largest observed meteor to enter the atmosphere since 1908 arrived just hours before a much larger object passed the planet uneventfully at a distance of about 27,000 kilometers.
“The fireball is not related in any way to 2012 DA14,” says Paul Chodas, a planetary scientist with NASA’s Near Earth Object Program at the Jet Propulsion Laboratory in Pasadena, Calif. Among other reasons, the meteor buzzed through the sky from north to south, the opposite trajectory of DA14.
The explosion had the equivalent of up to 500,000 tons of TNT, Campbell-Brown says. That’s about 30 times the energy output of the Hiroshima atomic bomb but only 5 percent of the energy...
(Excerpt) Read more at sciencenews.org ...
It didn’t explode, it grazed the atmosphere, and went on its way.
Global warming, some people just knew that SUVs and central heating would create asteroids and such things, now look what has happened.
Are you saying the meteorite made no earthly contact ?
I saw once piece of video of a hole in ice where they suspect
the remaining piece may have landed.
It was a joke, it was meant to be humor.
Perfectly predictable given the producers in the movie industry of today searching for newer and better ways to promote their glowbull-warming disaster movie genre.
Picture yourself a movie producer. Now, picture yourself working on a disaster movie. Say that movie is called "Meteor Apocalypse" or "Meteor Storm" or "The Meteor that ate the Urals". Now, you need a trailer to advertise your movie. You go to sleep one night with that need in mind, and then you wake up thinking about Orsen Well's War of the Worlds and the 1938 New Jersey radio thing on Halloween. Sold alot of books, eh? So, you come up with the idea of doing a modern-day version. Taking clips from the movie, meteors falling on a Russian city, you put them on Youtube and seed the social media sites with reports of meteors on the prowl, with spectacular video clips.
Sounds like the makings of a blockbuster movie! I can't wait till it comes to a local theater so I can drop $100 on tickets and popcorn and raisinets.
18 km/sec = over 40,000 mph (11 miles per second).
7,000 metric tons = over 17,000 fully loaded 747s.
Dat be some serious MV squared.
I have been wondering, though, for a while, “What would the effect be if a large meteor/small asteroid missed the earth by a mile (at its point of nearest approach, it was one mile above the ground)?”
There would be, of course, a heck of a sonic boom; over water it would probably trigger a tsunami, over a built-up area it would probably be as bad as being nuked.
The parts that burned off would probably have the same sun-obscuring effect as a volcanic eruption.
What else?
I’ve long believed a line from the Gnostic Gospel of Thomas: “For where the beginning is, there shall be the end.”
On the other hand, those Russky building inspectors are pretty lax :)
“...I couldn’t imagine a boom knocking down walls....”
That one factory bldg (in one pic I saw) really suffered some upper-level damage. The pic stunned me; looked like it took a direct hit. Guess those spanning beams bent and collapsed like spaghetti.
Liberals are confused about this, challenges their belief that whatever ‘bad’ happens, it’s always our fault.
People on FR are so smart...much smarter than all the astronomers and astrophysicists which state it exploded.
And BTW...it did explode. That is the reason for the sudden brightening and the twin trails that were one trail...then two after the explosion.
Now...some of it...maybe most of it did skip off into the atmosphere. However, no doubt pieces of it made it to earth.
It was not the sonic boom. It was the explosion of the mass caused by entry into the atmosphere
A comment on the video said the factory was in bad shape already. Stalin moved much of the Soviet Union’s manufacturing to that area of the Urals during WW2.
Who owns a meteroite?
It is estimated that the velocity of the meteor as it hit the atmosphere was roughly double that of an SRV (depending on whose data you use on the event).
My mind immediately went to the reactions of those Russian radar operators that had seconds to react to what must have looked like a warhead on trajectory for one of the most valuable military nuclear research targets of the last half century.
Regardless whether or not the Russian radars could actually track it, it might only have been its speed that kept something far worse from happening had hungover Russian radar operators had the time to make phone calls on what they might have seen on their screens, leaving hasty decisions up to other (potentially hungover) officers with both little time and little information on which to make a decision on response to what might have looked like an SRV on trajectory for a high-altitude airburst.
Just sayin'...
“Yet even an object too small to detect can produce an impressive amount of destruction.”
A warning from God: “I’m gonna’ git you suckas’!
Thanks for the post; thread. Fascinating, humorous, informative, educational.
Science/astronomy BUMP! Thread music...
http://www.youtube.com/watch?v=Y8IkO-G5ai4
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