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I said that I wouldn't post on this thread until January 30, but I make an exception to say just two things.
Originally posted by squidboy
Just thinking... SO they (NASA) say that it won't hit us, calculations rule it out, and it is nothing.
Distance from Impact: 100.00 km = 62.10 miles
Projectile Diameter: 300.00 m = 984.00 ft = 0.19 miles
Projectile Density: 3000 kg/m3
Impact Velocity: 9.48 km/s = 5.89 miles/s
Impact Angle: 45 degrees
Target Density: 2500 kg/m3
Target Type: Sedimentary Rock
Energy before atmospheric entry: 1.91 x 1018 Joules = 4.55 x 102 MegaTons TNT
The average interval between impacts of this size somewhere on Earth during the last 4 billion years is 1.2 x 104years
The projectile begins to breakup at an altitude of 44700 meters = 147000 ft
The projectile reaches the ground in a broken condition. The mass of projectile strikes the surface at velocity 9.03 km/s = 5.61 miles/s
The impact energy is 1.73 x 1018 Joules = 4.13 x 102MegaTons.
The broken projectile fragments strike the ground in an ellipse of dimension 0.884 km by 0.625 km
Crater shape is normal in spite of atmospheric crushing; fragments are not significantly dispersed.
Transient Crater Diameter: 3.13 km = 1.94 miles
Transient Crater Depth: 1.11 km = 0.688 miles
Final Crater Diameter: 3.65 km = 2.27 miles
Final Crater Depth: 0.437 km = 0.271 miles
The crater formed is a complex crater.
At this impact velocity ( < 12 km/s), little shock melting of the target occurs.
At this impact velocity ( < 15 km/s), little vaporization occurs; no fireball is created, therefore, there is no thermal radiation damage.
The major seismic shaking will arrive at approximately 20 seconds.
Richter Scale Magnitude: 6.3
Mercalli Scale Intensity at a distance of 100 km:
IV. Felt indoors by many, outdoors by few during the day. At night, some awakened. Dishes, windows, doors disturbed; walls make cracking sound. Sensation like heavy truck striking building. Standing motor cars rocked noticeably.
V. Felt by nearly everyone; many awakened. Some dishes, windows broken. Unstable objects overturned. Pendulum clocks may stop.
The ejecta will arrive approximately 144 seconds after the impact.
At your position there is a fine dusting of ejecta with occasional larger fragments
Average Ejecta Thickness: 858 micrometers = 33.8 1/1000 of an inch
Mean Fragment Diameter: 2.24 cm = 0.881 inches
The air blast will arrive at approximately 303 seconds.
Peak Overpressure: 5700 Pa = 0.057 bars = 0.81 psi
Max wind velocity: 13.1 m/s = 29.4 mph
Sound Intensity: 75 dB (Loud as heavy traffic)
Originally posted by V Kaminski
If it (E MOID) were to have another zero to the right of the decimal? Yup, that'd be a real concern. At this point I'm just watching the media reaction... the the public reaction, then? Maybe someone will start spending serious efforts on NEOs.
Originally posted by mungodave
Admin Update: the account below was originally posted on the Yahoo News Message boards, but has since been removed by Yahoo management. I've recovered the posting from Google Cache to include below
[edit on 21-1-2008 by SkepticOverlord]
Originally posted by Hellmutt
If it had hit Earth without fragmenting, it would have been like a Hiroshima blast.
Originally posted by V KaminskiNah, there is no secret space activities. Wink.
Such notables as Carl Sagan, in discussing means of preventing catastrophic natural collisions, have expressed concern about the possibility of deliberately
deflecting an asteroid toward earth as a weapon (Harris et al., 1994; Sagan, 1994; Sagan and Ostro, 1994).
Originally posted by dgtempe
but i didnt want to mention it for fear i'd be labelled a SUPER NUT.