Diskussion:2007 VK184

Arizona edu

letzte Version 23.11.08 uhb (nicht signierter Beitrag von 91.35.152.170 (Diskussion) 22:52, 23. Nov. 2008 (CET))

http://www.lpl.arizona.edu/impacteffects/

Impact Effects Robert Marcus, H. Jay Melosh, and Gareth Collins

Please note: the results below are estimates based on current (limited) understanding of the impact process and come with large uncertainties; they should be used with caution, particularly in the case of peculiar input parameters. All values are given to three significant figures but this does not reflect the precision of the estimate. For more information about the uncertainty associated with our calculations and a full discussion of this program, please refer to this article

Your Inputs:

   Distance from Impact: 100.00 km = 62.10 miles 
   Projectile Diameter: 130.00 m = 426.40 ft = 0.08 miles 
   Projectile Density: 3000 kg/m3 
   Impact Velocity: 19.00 km/s = 11.80 miles/s 
   Impact Angle: 45 degrees 
   Target Density: 2500 kg/m3 
   Target Type: Sedimentary Rock 

Energy:

   Energy before atmospheric entry: 6.23 x 1017 Joules = 1.49 x 10**2 MegaTons TNT
   The average interval between impacts of this size somewhere on Earth during the last 4 billion years is 5.2 x 10**3years

Atmospheric Entry:

   The projectile begins to breakup at an altitude of 55800 meters = 183000 ft
   The projectile reaches the ground in a broken condition. The mass of projectile strikes the surface at velocity 12.1 km/s = 7.54 miles/s
   The impact energy is 2.54 x 1017 Joules = 6.07 x 101MegaTons.
   The broken projectile fragments strike the ground in an ellipse of dimension 0.822 km by 0.581 km

Major Global Changes:

   The Earth is not strongly disturbed by the impact and loses negligible mass.
   The impact does not make a noticeable change in the Earth's rotation period or the tilt of its axis.
   The impact does not shift the Earth's orbit noticeably.

Crater Dimensions:

   What does this mean?

   Crater shape is normal in spite of atmospheric crushing; fragments are not significantly dispersed.

   Transient Crater Diameter: 1.86 km = 1.15 miles
   Transient Crater Depth: 0.657 km = 0.408 miles

   Final Crater Diameter: 2.32 km = 1.44 miles
   Final Crater Depth: 0.495 km = 0.308 miles

   The crater formed is a simple crater 

   The floor of the crater is underlain by a lens of broken rock debris (breccia) with a maximum thickness of 230 m = 753 ft.
   The volume of the target melted or vaporized is 0.0016 km3 = 0.000384 miles3 
   Roughly half the melt remains in the crater

   Thermal Radiation:
       What does this mean?

       At this impact velocity ( < 15 km/s), little vaporization occurs; no fireball is created, therefore, there is no thermal radiation damage.

   Seismic Effects:
       What does this mean?

       The major seismic shaking will arrive at approximately 20 seconds.
       Richter Scale Magnitude: 5.8
       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. 

   Ejecta:
       What does this mean?

       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: 106 micrometers = 4.19 1/1000 of an inch 
       Mean Fragment Diameter: 1.4 cm = 0.552 inches 

   Air Blast:
       What does this mean?

       The air blast will arrive at approximately 303 seconds.
       Peak Overpressure: 2520 Pa = 0.0252 bars = 0.358 psi
       Max wind velocity: 5.87 m/s = 13.1 mph
       Sound Intensity: 68 dB (Loud as heavy traffic)

   Tell me more...

   Click here for a pdf document that details the observations, assumptions, and equations upon which this program is based. It describes our approach to quantifying the important impact processes that might affect the people, buildings, and landscape in the vicinity of an impact event and discusses the uncertainty in our predictions. The processes included are: atmospheric entry, impact crater formation, fireball expansion and thermal radiation, ejecta deposition, seismic shaking, and the propagation of the atmospheric blast wave. (nicht signierter Beitrag von 91.35.152.170 (Diskussion) 23:03, 23. Nov. 2008 (CET)) 

Was bedeutet diese Zahl

2939:2940 - soll das ein Verhältnis sein? --Eingangskontrolle 18:55, 16. Jan. 2009 (CET)

Ja , das ist das verhältnis. Anders ausgedückt, impaktwahrscheinlichkeit ist 1:2940.

Verhältnis entfernt, da anscheinend missverständlich. (nicht signierter Beitrag von WahnfriedvB (Diskussion | Beiträge) 21:22, 5. Aug. 2009 (CEST))

Andere Daten bei NASA

"wurde von der NASA zeitweise als einziges Objekt mit einem Wert von 1 auf der Turiner Skala klassifiziert"

Hier http://neo.jpl.nasa.gov/risk/2007vk184.html ist er nach wie vor auf Stufe 1 und die Trefferwahrscheinlichkeit liegt höher bei 0,055% (1 zu 1820) --MichaEL (Diskussion) 15:46, 15. Feb. 2013 (CET)