New data in hand, another run with the Impact Calculator seems fitting.
Estimated diameter = 17 meters
I calculate a 17 meter ball has a volume of 2572.44 m^3
Estimated mass = 10000 metric tons = 10,000,000 kilograms
I calculate the density at 3888 kg/m^3
The Impact calculator allows any density entry or a choice of 4 presets:
[quotename="Impact Calculator"]1000 kg/m^3 ice
1500 kg/m^3 porous rock
3000 kg/m^3 dense rock
8000 kg/m^3 iron[/quote]
Shall we say very
dense rock? I'll enter the calculated value now that I have one of course. I have not seen a calculated angle of entry yet, and my 15º is an estimate based on what I saw in the videos. Duck & cover!!Earth Impact Effects Calculator
Distance from Impact: 1000.00 meters ( = 3280.00 feet )
Projectile diameter: 17.00 meters ( = 55.80 feet )
Projectile Density: 3888 kg/m3
Impact Velocity: 18.00 km per second ( = 11.20 miles per second )
Impact Angle: 15 degrees
Target Density: 2500 kg/m3
Target Type: Sedimentary Rock
Energy before atmospheric entry: 1.62 x 1015 Joules = 387.07 KiloTons TNT
The average interval between impacts of this size somewhere on Earth is 55.3 years
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 tilt of Earth's axis (< 5 hundreths of a degree).
The impact does not shift the Earth's orbit noticeably.
The projectile begins to breakup at an altitude of 46200 meters = 152000 ft
The projectile bursts into a cloud of fragments at an altitude of 31500 meters = 103000 ft
The residual velocity of the projectile fragments after the burst is 14.2 km/s = 8.82 miles/s
The energy of the airburst is 6.13 x 1014 Joules = 0.15 x 100 MegaTons.
No crater is formed, although large fragments may strike the surface.
The air blast will arrive approximately 1.59 minutes after impact.
Peak Overpressure: 47.6 Pa = 0.000476 bars = 0.00676 psi
Max wind velocity: 0.112 m/s = 0.251 mph
Sound Intensity: 34 dB (Easily Heard)[/quote]
All sounds in line with the ground effects in evidence, except the Sound Intensity seems way low. Rather than (Easily Heard) it should output (Impossible to Ignore).
Starting to hear reports of small suspected fragment recovery, however nothing big and nothing analyzed yet.
Edited by Turtle, 17 February 2013 - 12:32 AM.