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Asteroid 99942 Apophis
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RE: 2004 MN4
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L

Posts: 131433
Date:
Asteroid 99942 Apophis
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Apophis is a large asteroid which is expected to make unusually close approaches to Earth. It is a potential target for NASA's Orion Asteroid Mission, in which a modified Altair lunar lander will land crewmembers on a near-Earth asteroid.

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Researchers at NASA/JPL, Caltech, and Arecibo Observatory have released the results of radar observations of the potentially hazardous asteroid 99942 Apophis, along with an in-depth analysis of its motion. The research will affect how and when scientists measure, predict, or consider modifying the asteroid's motion. The paper has been accepted for publication in the science journal "Icarus" and was presented at the AAS/DPS conference in Orlando, Florida in October of 2007. The Apophis study was led by Jon Giorgini, a senior analyst in JPL's Solar System Dynamics group and member of the radar team that observed Apophis.

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RE: 2004 MN4
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99942 Apophis (2004 MN4)
Earth Impact Risk Summary
Torino Scale (maximum) 0
Palermo Scale (maximum) -2.42
Palermo Scale (cumulative) -2.41
Impact Probability (cumulative) 2.3e-05
Number of Potential Impacts 3
Vimpact 12.59 km/s
Vinfinity 5.87 km/s
H 19.7
Diameter 0.270 km
Mass 2.7e+10 kg
Energy 5.1e+02 MT
all above are mean values
weighted by impact probability
Analysis based on 2 radar delay, 5 Doppler, and
731 optical observations spanning 884.52 days
(2004-Mar-15.10789 to 2006-Aug-16.626954)

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Asteroid 2004 MN4
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The European Space Agency says scientists are getting ready for an international meeting to discuss preparations for a near-Earth flyby of asteroid Apophis.
The first International Academy of Astronautics Planetary Defence Conference will be held in Granada, Spain, next week. Among topics to be discussed is the April 13, 2029, Earth flyby of asteroid Apophis.

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Apophis
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Exactly 20 years from today, an asteroid about the size of a 25-story building will come closer to Earth than the networks of communications satellites orbiting the planet.
The chance of an impact are extremely remote - only about 1 in 45,000 - but the asteroid, named Apophis, will be back. Analysis of the asteroid's orbit show it will return to Earth seven years later.

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RE: 2004 MN4
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It might seem like the stuff of a 1950s' disaster film, but asteroid tagging looks set to be the next big business. Martin Hickes reports.
Just when it seemed nothing could be worse than the credit crunch and financial armageddon, scientists and politicians are increasingly turning their attention to a real-life "phantom menace".
Seventy years ago in the autumn of 1938, Orson Welles's radio suggestion that the Martians were coming caused those listening Americans more open to suggestion to take extreme action.

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The year 2029 could be crucial. When Apophis makes its first pass by Earth, its track can be more precisely determined. That will enable astronomers to judge whether Earth will escape with a near miss or will have to take swift action to avoid a blow that could devastate a region as large as Europe or the Eastern United States.

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Asteroid 2004 MN4
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A blue-ribbon panel of scientists is trying to determine the best way to detect and ward off any wandering space rocks that might be on a collision course with Earth.

"We're looking for the killer asteroid'' - James Heasley, of the University of Hawaii's Institute for Astronomy.

Congress asked the National Academy of Sciences to conduct the study after astronomers were unable to eliminate an extremely slight chance that an asteroid called Apophis will slam into Earth with devastating effect in 2036.

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RE: 2004 MN4
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Its only a speck, in comparative terms smaller than a dust mote in the vast expanse of sky all around us, but its got the scientists worried. The worries grow by the day, as the speck looms larger on their radar.
Astronomers call it 99942 Apophis (the Greek name of the ancient enemy of the Egyptian sun god Ra) or Asteroid 2004 MN4 and its hurtling towards planet Earth at some 20,000kph. It could result in the mother of all collisions in 2036.

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