Posted on 02/17/2015 5:55:47 AM PST by BenLurkin
Originally, astronomers thought that the Chelyabinsk meteor came from a 1.24-mile-wide (2 kilometers) near-Earth asteroid called 1999 NC43. But a closer look at the asteroid's orbit and likely mineral composition, gained from spectroscopy, suggests few similarities between it and the Russian meteor.
However, "the composition of [the] Chelyabinsk meteorite that was recovered after the event is similar to a common type of meteorite called LL chondrites," he added. "The near-Earth asteroid has a composition that is distinctly different from this."
More generally, Reddy and his colleagues' work showed that it is difficult to make predictions about what particular asteroid could have shed pieces that slammed into Earth. Because most asteroids are so small and their orbits are "chaotic," it's hard to make a firm link, the authors said.
(Excerpt) Read more at space.com ...
Chaotic? Orbit? Maybe just poor tracking comprehension.
I can imagine the same sort of cogitating is occuring, in regards to that meteor hole found down in Antartica.
Which begs the question ... since ‘the civilized world’ has a blind spot, or more precisely, a blind angle, called ‘any angular viewing direction within the Antartic Circle’, how can we track any asteroid/meteor/comet splinter coming at us from the near ‘vertical six o’ clock’ position??
-or-
“If a meteor/asteroid/comet splinter splashed into Antartica, would anyone hear it? Or, would it be ‘the guy’s fault’?”
—Nine days before 0bama reaches inside your computer.—
Um, it came from the eky?
CC
Originally, astronomers thought that the Chelyabinsk meteor came from a 1.24-mile-wide (2 kilometers) near-Earth asteroid called 1999 NC43. But a closer look at the asteroid's orbit and likely mineral composition, gained from spectroscopy, suggests few similarities between it and the Russian meteor.IOW, it was a moon of 1999 NC43, or possibly, the former icy constituents of it, blown off into orbit by an impact.
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At first I misread the post and thought it said the meteor was 1.24 miles in diameter. We might all be starved, dead, and frozen from a global asteroid induced winter by now if something that size hit. The meteor was actually estimated to be about 20 meters (which is also pretty damned big as these things go) and at first thought to be a spin off from an asteroid of the near mile and a half size. What might cause a chunk to come off and somehow change trajectory into the earth’s atmosphere would be the first thing I’d ask. I don’t think astrophysics works that way in the absence of some kind of major collision. But hey, I only took astronomy and physics in college, they weren’t my major.
Preliminary meteor attack like what happened to the alien planet in THIS ISLAND EARTH.
uhhh......outer space?
пришельцы
Could be...maybe running into a bunch of gravitational fields from other objects (like planets, moons, sun, etc.), so when you try to figure out its orbit, it just deflected again.
Yeah, that,s what computers and math models are for, not for climate models. Defund NASA GISS....
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