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Out Of Mind » SOLAR & PLANETARY ALERTS & INFO » ATMOSPHERIC CHANGES » Asteroid may be shaken by seismic quakes, as it zips by Earth

Asteroid may be shaken by seismic quakes, as it zips by Earth

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Asteroid may be shaken by seismic quakes, as it zips by Earth




Posted on February 15, 2013 by The Extinction Protocol





February 15, 2013 SPACE - An
asteroid which is to hurtle close to the Earth tomorrow may experience a
seismic jolt as it passes through our planet’s gravitational field,
scientists suggest. The 45m asteroid, named 2012 DA14, will fly by at
7.8 km/s at a distance of just 27,000 km from Earth. It will be visible
in New Zealand skies from about 2.30am (although not with a naked eye),
but will make its closest approach to the Earth about 8.25am. It is
forecast to be the closest recorded asteroid, passing well inside the
geostationary ring, where many communication satellites are located.
While Earth has experienced many tremors from asteroids striking our
planet, new research by Richard Binzel, a professor of planetary science
at the Massachusettes Institute of Technology, suggests many near-Earth
asteroids experience a seismic jolt when they pass too close to our
planet’s gravitational field. “We are going to be looking closely for
evidence of seismic activity on 2014 DA14 as it passes by,” Binzel said.
“This is the first case of an object coming close enough to experience
quakes and where we have enough notice to plan observations.” The idea
of asteroid-quakes came to Binzel when he was pondering a mystery about
“space-weathered” asteroids. “As asteroids move through space, they
slowly turn dark-red. This phenomenon, called ‘space weathering,’ is
caused by long exposure to cosmic rays and solar radiation. For decades,
however, we have known about a handful of small asteroids that looked
light and fresh; they were not space weathered.” Calculating the orbits
of the non-weathered asteroids, Binzel and colleagues discovered they
had all had close encounters with Earth in the past million years. “We
believe they were ‘shaken up’ by their encounters with Earth,” he said.
“Gravitational forces during the flybys can stretch, rattle, and torque
these asteroids, causing dark, space-weathered material on the surface
to be overturned, revealing the fresh stuff underneath.” Unlike on
Earth, there is no Richter scale for asteroids. Instead, Binzel measures
the force of the quakes in units of gravitational acceleration, or
gees. “These asteroids experience [seismic activity] in the milli- to
micro-g range,” Binzel said. “That might not sound like much, but
remember these are small bodies. Gravity is not very strong, so just a
little shaking or stretching goes a long way.” Binzel believed an
asteroid floating beside an asteroid experiencing such a quake would see
the surface “slowly sway or rock by a few centimeters. Other things to
look for would be puffs of asteroid-dust rising from the surface and
gentle avalanches on the steepest slopes of craters.” MIT post-doctorate
Nick Moskovitz, who works with Binzel, is coordinating observations
with worldwide observatories, including New Zealand’s Mt John
Observatory, to determine the colour spin, shape, and reflectivity of
2012 DA14 as it passes by. Changes in any of these quantities might be a
sign of a quake. “We stand to learn a lot from the observations,”
Binzel said. –NZ Herald


Thanks to: http://theextinctionprotocol.wordpress.com



  

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