7Kg Stone retrieved from the sky, fall onto uncle?s truck

[Lamerlamer12]

Hi guys I need help, my uncle kept claiming that this 7kg Stone was one of the stone that many were looking for 10 years ago. He found it on Malaysia back then.

 

Amazon Forum Fav 👍

DR.ÖTEK Metal Detector, Waterproof Gold Detector, Pinpoint & Terrain Modes, Professional Metal Detector - Grab it through Amazon!

[Tpmetal]

is a magnet attracted to it?

 

[Lamerlamer12]

I may have to question him again. This thing hit onto his truck roof and damaged the container. He has kept it for 10 years

 

[Tpmetal]

if it is what he says it is, he is going to have to have it authenticated by experts.... and the only way to do that is in person or by sending it to someone. Not sure which university or expert would be near you so start researching.

 

[jewelerguy]

This thing hit onto his truck roof and damaged the container.

I think a 7kg (15 lb) stone falling from the sky (presumably from space) would have went through the roof

 

[Red-Coat]

I think a 7kg (15 lb) stone falling from the sky (presumably from space) would have went through the roof

So would I.

12.37kg meteorite, slowed by Earth’s atmosphere to a terminal velocity around 200mph, meets Michelle Knapp’s Chevrolet Malibu parked in her driveway in Peekskill NY in 1992:



The meteorite punched through the trunk, narrowly missing the fuel tank, and created an impact pit in the driveway beneath.

If that were a meteorite then it would have to be an individual with full fusion crust, not the result of a (potentially slower arriving) fragment from detonation of a larger meteor in the atmosphere. I see some ‘oriented’ lines on it, but they don’t look like typical flow-lines from atmospheric ablation.

The only way to be sure is from professional testing, but I would be very doubtful based on what I can see. Incidentally, if it did turn out to be a meteorite then the damaged truck itself would also have had considerable collector value.

 

[xr7ator]

Cool pic, Red-Coat.

 

[BC1969]

Terminal velocity was debunked by Felix Baumgartner. In a jump from a balloon, he accelerated to 846mph!
That's faster than the speed of sound.
I doubt that meteorite hit at just 200mph!



Thanks for sharing that though..more reading.

 

[Red-Coat]

Terminal velocity was debunked by Felix Baumgartner. In a jump from a balloon, he accelerated to 846mph!
That's faster than the speed of sound.
I doubt that meteorite hit at just 200mph!

Noooo!

Objects falling through the Earth’s atmosphere accelerate downwards due to the force of gravity acting on their mass. As their velocity increases, frictional forces such as air resistance create drag such that there is ultimately no longer any acceleration and they then fall at a constant velocity. However, ‘constant’ is a misleading term because the actual terminal velocity for any given set of conditions is influenced by the shape and orientation of the object and by the density of the atmosphere it’s travelling through.

Baumgarter started his jump from 128,100 feet where the atmosphere is much thinner and achieved a terminal velocity of 840 mph by optimising his profile to minimise drag. He only achieved that for a short time at high altitude, and neither did nor could have achieved it throughout his entire descent.

 

[villagenut]

Cool pic, Red-Coat.

I bet that car was worth a bit more after the damage......

 

[BC1969]

Noooo!

Objects falling through the Earth?s atmosphere accelerate downwards due to the force of gravity acting on their mass. As their velocity increases, frictional forces such as air resistance create drag such that there is ultimately no longer any acceleration and they then fall at a constant velocity. However, ?constant? is a misleading term because the actual terminal velocity for any given set of conditions is influenced by the shape and orientation of the object and by the density of the atmosphere it?s travelling through.

Baumgarter started his jump from 128,100 feet where the atmosphere is much thinner and achieved a terminal velocity of 840 mph by optimising his profile to minimise drag. He only achieved that for a short time at high altitude, and neither did nor could have achieved it throughout his entire descent.

That's good to know..but I still guarantee that meteorite was traveling way faster than 200mph.

 

[Red-Coat]

I bet that car was worth a bit more after the damage......

Indeed. The car had been a recent purchase for $300. Immediately following the meteorite hit, it was sold to Iris Lang, the wife of renowned meteorite collector and dealer Al Lang, for $25,000. It's hired out from time to time for display at shows and exhibitions.

 

[Red-Coat]

That's good to know..but I still guarantee that meteorite was traveling way faster than 200mph.

From The American Meteor Society's FAQs:

Meteoroids enter the earth’s atmosphere at very high speeds, ranging from 11 km/sec to 72 km/sec (25,000 mph to 160,000 mph). However, similar to firing a bullet into water, the meteoroid will rapidly decelerate as it penetrates into increasingly denser portions of the atmosphere. This is especially true in the lower layers, since 90 % of the earth’s atmospheric mass lies below 12 km (7 miles / 39,000 ft) of height.

At the same time, the meteoroid will also rapidly lose mass due to ablation. In this process, the outer layer of the meteoroid is continuously vaporized and stripped away due to high speed collision with air molecules. Particles from dust size to a few kilograms mass are usually completely consumed in the atmosphere.

Due to atmospheric drag, most meteorites, ranging from a few kilograms up to about 8 tons (7,000 kg), will lose all of their cosmic velocity while still several miles up. At that point, called the ******ation point, the meteorite begins to accelerate again, under the influence of the Earth’s gravity, at the familiar 9.8 meters per second squared. The meteorite then quickly reaches its terminal velocity of 200 to 400 miles per hour (90 to 180 meters per second). The terminal velocity occurs at the point where the acceleration due to gravity is exactly offset by the deceleration due to atmospheric drag.

Meteoroids of more than about 10 tons (9,000 kg) will retain a portion of their original speed, or cosmic velocity, all the way to the surface. A 10-ton meteroid entering the Earth’s atmosphere perpendicular to the surface will retain about 6% of its cosmic velocity on arrival at the surface. For example, if the meteoroid started at 25 miles per second (40 km/s) it would (if it survived its atmospheric passage intact) arrive at the surface still moving at 1.5 miles per second (2.4 km/s), packing (after considerable mass loss due to ablation) some 13 gigajoules of kinetic energy.

On the very large end of the scale, a meteoroid of 1000 tons (9 x 10^5 kg) would retain about 70% of its cosmic velocity, and bodies of over 100,000 tons or so will cut through the atmosphere as if it were not even there. Luckily, such events are extraordinarily rare.


Note: forum censorship filter had replaced 'r e t a r d' with a row of asterisks, for understandable reasons.

 

[crashbandicoot]

I may have to question him again. This thing hit onto his truck roof and damaged the container. He has kept it for 10 years

I think there,s a failure to communicate here.Do these things fall from the sky in containers?Was the truck in Malaysia?What exactly does he say it is?I,m confused.

 

[BC1969]

Okay.
None of what you posted takes into account angle of descent.
Straight down vs skipping across the atmosphere and slowing down before gravity brings it to the surface.

I can copy and paste too.
Do you have anything of your own to add ?

 

[BC1969]

Did you know that there was a woman in Alabama in the 1950's who was sitting on her couch in her living room and a meteorite came through her roof and ceiling and hit her upon her shoulder.

This topic reminded me of it.

 

[Red-Coat]

Okay.
None of what you posted takes into account angle of descent.
Straight down vs skipping across the atmosphere and slowing down before gravity brings it to the surface.

I can copy and paste too.
Do you have anything of your own to add ?

The Peekskill meteorite fall was captured as a fireball on at least fourteen video recordings. We therefore have a detailed record of both its trajectory and change in velocity during flight. The earliest pick-up of it on camera enabled its initial cosmic velocity to be calculated at around 31,000-33,000 miles per hour at a height of about 29-30 miles. By the time of impact, it had slowed to 164 miles per hour, as evidenced by the video recordings. I rounded this off to ?about 200 miles per hour? when I replied.

That?s a pretty usual bottom-end impact speed for small to medium size meteorites, up to about 400 miles per hour, as per the reference information I posted from AMS? and that?s why I copied and pasted it? as an authoritative source.

Yes, some meteorites will come in faster and it does depend on angle of entry but more so on mass and a number of other factors. Peekskill came in on a shallow trajectory, hence its speed being at the lower end of the scale.

PS: I have studied and collected meteorites, tektites and impactites for around 40 years.

 

[crashbandicoot]

BC1969,I don,t know if you mean my post but what I meant was that the object was said to have been found in Malaysia,did it hit the truck there too?What is this container that was spoken of?What exactly is the object suspected to be?Sounds like something may be getting lost in the translation.No attempt to disrespect any one here,just genuinely confused!I have nothing to add as to what it is.but would like to know.Thank you and again no smart assing meant from me!

 

[BC1969]

I've been studying these since I was very young and I happen to know quite a bit about the science behind it.

Who is "we" ?

I was just hoping to learn something other than what I can read about.

Have a great day!

 

[Red-Coat]

Did you know that there was a woman in Alabama in the 1950's who was sitting on her couch in her living room and a meteorite came through her roof and ceiling and hit her upon her shoulder.

This topic reminded me of it.

Yes, fortunately for Mrs Hodges, the meteor came in at a relatively shallow angle; suffered a fragmentation in the atmosphere to produce at least three smaller pieces; was slowed by crashing through the house; then bounced off her radiogram before it hit her; and she was sleeping on a couch with a quilt over her body. Nevertheless, she suffered quite a bruise:

[Picture from Smithsonian Institution]