Posted on 06/21/2002 5:16:28 AM PDT by Cincinatus' Wife
WASHINGTON (Reuters) - An asteroid the size of a soccer field whizzed by Earth at a distance much nearer than the Moon, the biggest such space rock in decades to get this close, scientists said on Thursday.
Asteroid 2002MN was not detected until Monday, three days after its closest approach on June 14, when it got within 75,000 miles of Earth and was traveling at a speed of some 23,000 miles per hour, astronomers said.
It is now several million miles away, according to Brian Marsden of the Harvard-Smithsonian Center for Astrophysics' Minor Planet Center, which tracks asteroids.
"It's the largest (asteroid) we've seen at that distance in the last several decades," Marsden said in a telephone interview.
The last time any asteroid came this close was in 1994, according to the Near Earth Object Information Center in Britain.
The big rock, with a diameter of roughly 50 yards to 120 yards, would not have caused global catastrophe if it had struck Earth. That would take an asteroid of several miles diameter.
However, if it had hit Earth, it had the potential to cause as much local devastation as a 1908 hit in Tunguska, Siberia, which flattened some 800 square miles of forest.
Asteroid 2002MN was first spotted by the Lincoln Near Earth Asteroid Research program, based in Socorro, New Mexico.
"It's a good thing it missed the Earth, because we never saw it coming," Steve Maran of the American Astronomical Society said in a telephone interview. "The asteroid wasn't discovered until three days after it passed its closest approach to our planet."
LINEAR is part of the National Aeronautics and Space Administration's initiative to find 90 percent of all near-Earth objects, including asteroids, that measure .62 mile or more in diameter by 2008.
An asteroid the size of 2002MN may hit Earth about once every hundred years or so, and the planet may not have seen the last of this one, Marsden said.
"There is a slim chance it could hit in 2061," he said, putting that chance at about one in 100,000.
"At some level, it behooves us to look out for these things," he said.
Asteroid 2002 MN will be observable by some telescopes but it is getting fainter as it moves away, Marsden said.
As of now, we have nothing to stop or deflect these monsters in space.
Aaaiiieeee! They sky is falling.
Let me count the number of asteroids with diameters in the thousands of miles. Hmmm, that would be zero.
Ceres is the largest asteroid, and its diamter is about 600 miles. A NASA site I found had only 7 with diameters above 100 miles, but I don't know if that list was complete.
Good point - I think I'm going to run out and buy a hard hat at lunch time today...
It's always pulled in by Earth's gravity, and vice versa.
The real question: What did Bush know and when did he know it?
--Boris
At least they didn't read any poetry
Looks like another blue ribbon panel needs to be created. Was Bush hiding this information? What did he know, when did he know it, and why didn't he warn us?
Was Bush hiding this information? What did he know, when did he know it, and why didn't he warn us?
Bumps!
Bump!
There's now no doubt that several great extinctions of life on earth in the past were caused by asteroid hits. Granted, they don't happen often but when they do -- like eruptions of Vesuvius or other sleeping giants -- they can be devastating.
In the end we're all dead anyway but, for the living I don't think it's paranoid to invest some of our intellect and treasure into figuring out 1) how to demolish/deflect cosmic intruders once detected, then 2) how to detect them.
If you're asking yourself what possible politcal purpose could there be in that, consider this: If voters knew the world was going to end in two weeks, they might just go ahead and vote for a liberal on the "it doesn't make any difference now" theory.
I am a pilot and have found that if you see other airplanes that appear to be moving, you will not collide.
If you see another airplane and it does not appear to be moving, you are on a collision course.
What I have concluded from that is, you will not detect the one that is going to hit. That is why this one got so close before they saw it. It had to appear to be moving and so would miss.
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