KFO

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KFO

Post by macdoc » Fri Apr 04, 2014 12:09 am

Known Flying Object

what are the odds

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Re: KFO

Post by FBM » Fri Apr 04, 2014 12:19 am

Holy shit. :?
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Re: KFO

Post by mistermack » Fri Apr 04, 2014 12:32 am

How do they know it was a meteorite?

I would firstly suspect something got wrapped up in the parachute. Then that something fell off the plane.

Meteorite would be if everything else had been disproved.
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Re: KFO

Post by pErvinalia » Fri Apr 04, 2014 2:18 am

If it was a meteorite it should be glowing bright, shouldn't it?

Can i shag the reporter? She was so casual.
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Re: KFO

Post by camoguard » Fri Apr 04, 2014 2:21 am

The skydiver would be jealous if we allowed that.

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Re: KFO

Post by FBM » Fri Apr 04, 2014 2:35 am

The media are calling it a meteorite, so it's a meteorite. Now shut up and get back to consuming. :coffee:
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Re: KFO

Post by Hermit » Fri Apr 04, 2014 3:23 am

macdoc wrote:Known Flying Object

what are the odds

The odds are a damn sight better for this clip to be faked than that the skydiver got anywhere near one. Meteorites enter the atmosphere at between 11 and 72 kilometres per second. With a rate of 25 or 29 frames per second a video camera is unlikely to record one this close to the diver on a single one, let alone a sequence of a rock lazily rotating for a considerable length of time. And as rEv pointed out, due to the heat caused by the speed of entry, meteors burn and melt on their way down.
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Re: KFO

Post by macdoc » Fri Apr 04, 2014 6:26 am

you 're wrong but nothing I can do will convince you since you don't understand what terminal velocity is.
The first modern instance of a meteorite striking a human being occurs at Sylacauga, Alabama, when a meteorite crashes through the roof of a house and into a living room, bounces off a radio, and strikes a woman on the hip. The victim, Mrs. Elizabeth Hodges, was sleeping on a couch at the time of impact. The space rock was a sulfide meteorite weighing 8.5 pounds and measuring seven inches in length. Mrs. Hodges was not permanently injured but suffered a nasty bruise along her hip and leg.
Image
The Peekskill Meteorite Car is the red 1980 Chevrolet Malibu struck by the Peekskill Meteorite, one of the most historic meteorite events on record. Piercing Earth's atmosphere on a Friday night, the meteorite was captured across the East Coast by a record 16 different video cameras on hand to tape high school football games. The vast majority of meteorite descents are never caught on tape – and none have been captured from as many angles and localities as Peekskill. The multiple perspectives provided the ability to calculate the meteorite's flight path to Earth, including its orbit around the sun, an exceedingly rare opportunity for the scientific community. As a result of the rare circumstances regarding its descent, the meteorite (known simply as 'Peekskill' in scientific parlance) enjoys a rare level of fame – even the Science Channel includes Peekskill in its "Top Ten" meteorites.
As if its entrance was not enough, it smashed through a car parked on a driveway in Peekskill, New York at approximately 7:50 pm EDT. Hitting the car at approximately 164 miles per hour after being slowed by the Earth's atmosphere, Peekskill narrowly missed the gas tank before finally coming to rest below the car in a shallow crater. 18 year-old Michelle Knapp had just purchased the car for $400, and when she heard what sounded like a "three-car crash" in her driveway, she ran outside to investigate. She called the police who initially reported this as an act of vandalism. It was a neighbor who reasoned that vandals can't through rocks through cars and that the 26-pound warm rock which had a smell akin to sulfur was from outer space.
http://www.meteoritecar.com/history.html

But do go on in your delusion... :roll:
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Re: KFO

Post by FBM » Fri Apr 04, 2014 7:10 am

I am not knowing, but it's more than just a wild guess:
“It can’t be anything else”
Although Helstrup is still not completely convinced that it was indeed a meteorite that flew past him, the experts are in no doubt.

“It can’t be anything else. The shape is typical of meteorites – a fresh fracture surface on one side, while the other side is rounded,” said geologist Hans Amundsen.

He explained that the meteorite had been part of a larger stone that had exploded perhaps 20 kilometres above Helstrup.

...

“A world first”
When a meteoroid enters the Earth’s atmosphere, it slows down and ionizes molecules around it; it is this blazing track across the sky that is called a meteor.

When the light disappears, the meteorite enters the stage called "dark flight"; it then no longer travels at an angle, but falls straight down.

“It has never happened before that a meteorite has been filmed during dark flight; this is the first time in world history,” said Amundsen.
http://www.nrk.no/viten/skydiver-nearly ... 1.11646757
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Re: KFO

Post by rainbow » Fri Apr 04, 2014 8:05 am

Kentucky Fried Octopus?
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Re: KFO

Post by Hermit » Fri Apr 04, 2014 8:13 am

macdoc wrote:you 're wrong but nothing I can do will convince you since you don't understand what terminal velocity is.
I suggest you read up on "terminal velocity".

Felix Baumgartner commenced with a velocity of 0 and finished up freefalling at 1357 km/h before the parachute was activated, which happened about 2000 metres above ground level. A meteor's weight to drag ratio is a lot higher than that of a Baumgartner, and it does not start from 0 velocity. It enters the atmosphere at anywhere between 11000 and 72 000 metres per second. Of course it slows down once it hits the atmosphere, but not to the extent that it is likely to be captured even by a highspeed Gopro camera on the helmet of a parachutist descending at the leisurely pace of less than 4 metres per second.

Anders Helstrup's video clip is a hoax, but do go on in your delusion... :roll:
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Re: KFO

Post by MiM » Fri Apr 04, 2014 8:14 am

Well, unlikely things do sometimes happen, but...
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Re: KFO

Post by PsychoSerenity » Fri Apr 04, 2014 9:08 am

Seems perfectly possible to me.
Hermit wrote:A meteor's weight to drag ratio is a lot higher than that of a Baumgartner
That's going to depend on the size, shape and density of it. For a small one it's going to be low.
The average velocity of meteoroids entering our atmosphere is 10-70 km/second. The smaller ones that survive the trip to the Earth's surface are quickly slowed by atmospheric friction to speeds of a few hundred kilometers per hour, and so hit the Earth with no more speed than if they had been dropped from a tall building. http://csep10.phys.utk.edu/astr161/lect ... pacts.html
If this is the case you wouldn't necessarily even see the difference between a real meteor, and one dropped from above.
[Disclaimer - if this is comes across like I think I know what I'm talking about, I want to make it clear that I don't. I'm just trying to get my thoughts down]

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Re: KFO

Post by Hermit » Fri Apr 04, 2014 9:34 am

PsychoSerenity wrote:Seems perfectly possible to me.
Hermit wrote:A meteor's weight to drag ratio is a lot higher than that of a Baumgartner
That's going to depend on the size, shape and density of it. For a small one it's going to be low.
Size has nothing to do with density.
PsychoSerenity wrote:
The average velocity of meteoroids entering our atmosphere is 10-70 km/second. The smaller ones that survive the trip to the Earth's surface are quickly slowed by atmospheric friction to speeds of a few hundred kilometers per hour, and so hit the Earth with no more speed than if they had been dropped from a tall building. http://csep10.phys.utk.edu/astr161/lect ... pacts.html
If this is the case you wouldn't necessarily even see the difference between a real meteor, and one dropped from above.
Ok, let's go with a figure of 500km/h. That'll be 138 metres per second. How would that look like to a camera travelling at a rate of less than 4 metres per second relative to it?

I think the most likely explanations for what we see are that the item was dropped from the aeroplane or that two video streams were combined with one of the many software programs designed to do just that.
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Re: KFO

Post by MiM » Fri Apr 04, 2014 10:06 am

Hermit wrote:
PsychoSerenity wrote:Seems perfectly possible to me.
Hermit wrote:A meteor's weight to drag ratio is a lot higher than that of a Baumgartner
That's going to depend on the size, shape and density of it. For a small one it's going to be low.
Size has nothing to do with density.
PsychoSerenity wrote:
The average velocity of meteoroids entering our atmosphere is 10-70 km/second. The smaller ones that survive the trip to the Earth's surface are quickly slowed by atmospheric friction to speeds of a few hundred kilometers per hour, and so hit the Earth with no more speed than if they had been dropped from a tall building. http://csep10.phys.utk.edu/astr161/lect ... pacts.html
If this is the case you wouldn't necessarily even see the difference between a real meteor, and one dropped from above.
Ok, let's go with a figure of 500km/h. That'll be 138 metres per second. How would that look like to a camera travelling at a rate of less than 4 metres per second relative to it?

I think the most likely explanations for what we see are that the item was dropped from the aeroplane or that two video streams were combined with one of the many software programs designed to do just that.
Well, that'll be about 2 meters/frame, if shot at 60 fps. Looks about right if you look carefully at the slow motion shots. To me they look like the stone can be seen in just a few (less than 10) distinctive positions, which would then correspond with a falling height of about 20 meters or less. Shutter speed would be very high, up in the air on a clear day that that, so no problem with the stone not being blurred out.
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