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Originally posted by ncuncfan2006
Their have been asteroids over the years that have made the media saying it would be a close pass but not hit us.
It was not big news. So if Nasa is lying cover up etc etc and they also control the media could they not tell the media to inform the public this is another close pass asteroid like those in the past and like those it to will not threaten us?
Its really no biggy
[edit on 23-1-2008 by ncuncfan2006]
Originally posted by ArMaP
reply to post by mattguy404
According to the Earth Impact Effects Program, a rock of that size would make some serious damage. Not on a global scale, but at a distace of 100km it would be strong enough to break glass windows.
Distance from Impact: 10.00 km = 6.21 miles
Projectile Diameter: 300.00 m = 984.00 ft = 0.19 miles
Projectile Density: 3000 kg/m3
Impact Velocity: 17.00 km/s = 10.56 miles/s
Impact Angle: 45 degrees
Target Density: 2500 kg/m3
Target Type: Sedimentary Rock
Energy before atmospheric entry: 6.13 x 1018 Joules = 1.46 x 103 MegaTons TNT
The average interval between impacts of this size somewhere on Earth during the last 4 billion years is 3.0 x 104years
Atmospheric Entry: The projectile begins to breakup at an altitude of 54000 meters = 177000 ft
The projectile reaches the ground in a broken condition. The mass of projectile strikes the surface at velocity 16.1 km/s = 10 miles/s
The impact energy is 5.53 x 1018 Joules = 1.32 x 103MegaTons.
The broken projectile fragments strike the ground in an ellipse of dimension 0.904 km by 0.639 km
Crater shape is normal in spite of atmospheric crushing; fragments are not significantly dispersed.
Transient Crater Diameter: 4.04 km = 2.51 miles
Transient Crater Depth: 1.43 km = 0.888 miles
Final Crater Diameter: 4.88 km = 3.03 miles
Final Crater Depth: 0.477 km = 0.296 miles
The crater formed is a complex crater.
The volume of the target melted or vaporized is 0.0348 km3 = 0.00835 miles3
Roughly half the melt remains in the crater , where its average thickness is 2.71 meters = 8.89 feet
Time for maximum radiation: 0.219 seconds after impact
Visible fireball radius: 2.75 km = 1.71 miles
The fireball appears 6.25 times larger than the sun
Thermal Exposure: 1.90 x 105 Joules/m2
Duration of Irradiation: 46 seconds
Radiant flux (relative to the sun): 4.13
The major seismic shaking will arrive at approximately 20 seconds.
Richter Scale Magnitude: 6.7
Mercalli Scale Intensity at a distance of 100 km:
VI. Felt by all, many frightened. Some heavy furniture moved; a few instances of fallen plaster. Damage slight.
VII. Damage negligible in buildings of good design and construction; slight to moderate in well-built ordinary structures; considerable damage in poorly built or badly designed structures; some chimneys broken.
The ejecta will arrive approximately 144 seconds after the impact.
At your position the ejecta arrives in scattered fragments
Average Ejecta Thickness: 2.39 mm = 0.094 inches
Mean Fragment Diameter: 3.01 cm = 1.19 inches
The air blast will arrive at approximately 303 seconds.
Peak Overpressure: 10000 Pa = 0.1 bars = 1.42 psi
Max wind velocity: 22.6 m/s = 50.6 mph
Sound Intensity: 80 dB (Loud as heavy traffic)
Glass windows will shatter.
Originally posted by DancedWithWolves
Cause of death Chances
Asteroid/comet impact 1 in 20,000
Originally posted by Mysteryinthesky
It will fly by on Tuesday, being around 534,000 kilometers (334,000 miles) from the Earth at its closest point at 0834 GMT, according to a Near Earth Object (NEO) database compiled by the University of Pisa in Italy.