Astrophysics Problem. Asteroid Impact effects Imperial College London has a very

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Astrophysics Problem. Asteroid Impact effects

Imperial College London has a very nice set of web-based Earth Impact Effects calculators. For this problem I want you to use the damage-map version (impact.ese.ic.ac.uk/ImpactEffectsMap/). You need the free Google Earth plug-in (www.google.com/earth/explore/products/plugin.html) to use the mapping functions. I’ve tested this problem on Firefox and Safari. Setup the asteroid to strike this location: Latitude 42.26584 degrees (north) Longitude 83.74865 degrees (West) – note the minus () sign! To constrain the problem, setup the calculation for the following parameters: Projectile Density: 1500 kg/m3 (porous rock) Impact Velocity: 17 km/sec (average speed of an asteroid hitting the Earth) Impact Angle: 90 degrees (direct hit) Target Type: Sedimentary Rock (rock typical of the impact location above) You will be changing the diameter of the impacting body as you work this problem. Start with 100 meters for the projectile diameter and work up or down as needed to answer each question.

a. What diameter asteroid would have Columbus just at the outer edge of the Seismic shaking damage radius?

b. What diameter asteroid will have Columbus just at the edge of the Air Blast damage radius?

c. What diameter asteroid will have Columbus just at the edge of the ejecta blanket formed (the outermost circle plotted is ejecta debris >1cm thick)?

d. Comment on the results of your exercise.

Explanation / Answer

answer- the location where the impact occur is Latitude 42.26584 degrees (north) Longitude 83.74865 degrees (West)

diameter of projectile is 100m , density about 1500 kg/m3 , impact velocity about 17km/sec

imapct angle = 90

our target type is sedimentary rock

answer a- the diameter of asteriod at the outer edge of the seismic shaking radius damage. the transient diameter of the crater is 843 meters

answer b- and final diameter of the crater is 1.05km. simple crater is formed by this protectile impact on sedimentary rock target.

answer- c- and the thickness of the damage of rock debris 104meters

answer- 4- the result of this projectile impact on the sedimentary rock by various impact effect ejecta/air blast/ seismic shaking. the crater shape is normal in the spite of atmospheric crushing. and fragment are not dispersed on the surface of crater. the earth is not effect by this impact. there is no noticable change in the tilt of earth axis.

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