[thotgor]

Ecco cosa succederebbe a 500km di distanza con quell'oggetto di 410 m di diametro (che non ragiungerebbe intero al superficie)




Your Inputs:
Distance from Impact: 500.00 km = 310.50 miles
Projectile Diameter: 410.00 m = 1344.80 ft = 0.25 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:
Energy before atmospheric entry: 1.56 x 1019 Joules = 3.74 x 103 MegaTons TNT
The average interval between impacts of this size somewhere on Earth during the last 4 billion years is 6.2 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 15.7 km/s = 9.76 miles/s
The impact energy is 1.34 x 1019 Joules = 3.19 x 103MegaTons.
The broken projectile fragments strike the ground in an ellipse of dimension 1.27 km by 0.897 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: 5.1 km = 3.17 miles
Transient Crater Depth: 1.8 km = 1.12 miles

Final Crater Diameter: 6.34 km = 3.94 miles
Final Crater Depth: 0.516 km = 0.32 miles

The crater formed is a complex crater.
The volume of the target melted or vaporized is 0.0841 km3 = 0.0202 miles3
Roughly half the melt remains in the crater , where its average thickness is 4.12 meters = 13.5 feet

Thermal Radiation:
What does this mean?


The fireball is below the horizon. There is no direct thermal radiation.

Seismic Effects:
What does this mean?


The major seismic shaking will arrive at approximately 100 seconds.
Richter Scale Magnitude: 6.9
Mercalli Scale Intensity at a distance of 500 km:

III. Felt quite noticeably by persons indoors, especially on upper floors of buildings. Many people do not recognize it as an earthquake. Standing motor cars may rock slightly. Vibrations similar to the passing of a truck.

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.


Ejecta:
What does this mean?


The ejecta will arrive approximately 334 seconds after the impact.
At your position there is a fine dusting of ejecta with occasional larger fragments
Average Ejecta Thickness: 48.3 micrometers = 1.9 1/1000 of an inch
Mean Fragment Diameter: 554 micrometers = 21.8 1/1000 of an inch


Air Blast:
What does this mean?


The air blast will arrive at approximately 1520 seconds.
Peak Overpressure: 1800 Pa = 0.018 bars = 0.255 psi
Max wind velocity: 4.2 m/s = 9.41 mph
Sound Intensity: 65 dB (Loud as heavy traffic)