Slcpilot
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Did The Feb. 15 Meteorite Course....

Fri Feb 15, 2013 1:59 pm

Did today's meteorite course in Russia parallel the course of the object passing near earth later today? If so, could other impacts be possible?

To relate this more to aviation, have any aircraft ever been diverted or grounded to to phenomena outside the atmosphere such as solar activity or even meteor showers?

Several months ago we saw 40-50 meteors during a short flight from LAX to SLC. It was actually pretty cool!

Cheers!

SLC"duck!"Pilot
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jollo
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Did The Feb. 15 Meteorite Course....

Fri Feb 15, 2013 4:59 pm

The amateur videos on YouTube suggest a high-altitude event: people had time to grab their camcorders and to begin shooting the vapor trail in the sky when the shock waves reached the ground, shattering windows and setting alarms off. Probably too high to be a danger to civilian air traffic. Still...

Reports in early newswires of several hundred people injured by "crystals" raining down from the disintegrating meteor are very unlikely in my opinion: meteors don't leave trails of sharp "crystals", and if they did the speed upon reaching the ground would be relatively low. Much more likely people have been hurt by flying shards of glass from broken windows: outdoor shockwawes make windows "implode" inwards, very dangerous for anyone standing indoors near the window staring at the massive trail in the sky...

My sympaties to anyone hurt in the event.
 
F27Friendship
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Did The Feb. 15 Meteorite Course....

Fri Feb 15, 2013 7:25 pm

Russian media is suggesting a SAM battery intercepted a piece at 20 km altitude.

http://english.ruvr.ru/2013_02_15/Ur...tercepted-by-Russia-s-air-defense/

I would reckon a meteorite would have a higher velocity than a ballistic missile, so if they did manage to hit it, probably quite an achievement.

This is probably how an incoming Nuke would look like:

http://www.youtube.com/watch?v=PXFq-RWdpnI

[Edited 2013-02-15 11:30:30]
 
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Stitch
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Did The Feb. 15 Meteorite Course....

Fri Feb 15, 2013 8:18 pm

Quoting Slcpilot (Thread starter):
Did today's meteorite course in Russia parallel the course of the object passing near earth later today? If so, could other impacts be possible?

"No" and "No" per Dr. Keith Smith, an astronomer at Britain's Royal Astronomical Society, and planetary scientist Samuel Kounaves at Tufts University in Boston.
 
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csturdiv
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Did The Feb. 15 Meteorite Course....

Fri Feb 15, 2013 8:43 pm

Quoting Slcpilot (Thread starter):
Did today's meteorite course in Russia parallel the course of the object passing near earth later today? If so, could other impacts be possible?

I believe that this meteor came in from the north. and the asteroid passing by is coming from the south. This was just a coincidence.
An American expat from the ORD area living and working in SYD
 
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bikerthai
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Did The Feb. 15 Meteorite Course....

Fri Feb 15, 2013 10:43 pm

"when a salvo missile allegedly burst the “shooting star” at an altitude of 20 kilometers"


Wonder how many of the salvo actually hit the target and how many fell to earth as debris.

Very good practice, and probably good policy if you can detonate the meteor higher in the atmosphere as oppose to have it detonate closer to earth and at a minimum cause a large forest fire.

Wonder if the US missile defense system can do the same?

bt
Intelligent seeks knowledge. Enlightened seeks wisdom.
 
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ssteve
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Did The Feb. 15 Meteorite Course....

Fri Feb 15, 2013 11:30 pm

Russia hitting this thing with a SAM didn't happen.
 
yyzala
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Did The Feb. 15 Meteorite Course....

Sat Feb 16, 2013 4:49 am

Quoting bikerthai (Reply 5):
Wonder if the US missile defense system can do the same?

Highly unlikely that any system can shoot it down. The meteorite moves at 30 km/s (probably slower once enters atmosphere) vs your top end S400 or ABM3 of 4 km/s? By the time you lock on it (highly unlikely), it will be out of your missiles range.
 
F27Friendship
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Did The Feb. 15 Meteorite Course....

Sat Feb 16, 2013 5:52 am

Dutch media were talking about the meteorite entering at 51000 km an hour, about 14,1 km/s

after that it would slow down.
 
jollo
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Did The Feb. 15 Meteorite Course....

Sat Feb 16, 2013 1:15 pm

There's little to no chanche that what we see on YouTube is a successful intercept:
* the meteor entered the upper atmosphere with at least double the speed of an ICBM in mid-course: that's enough to screw any intercept solution
* the meteor mass is estimated around 10t: an ABM warhead wouldn't do much good
* the "fireball" clearly visible in many videos develops over way too many seconds to be a warhead explosion. A "fireball" growing brighter and brighter and finally flaring is consistent with the natural fragmentation of a meteor: bigger chunks break up in small pieces that burn and break up quicker, into smaller pieces that burn and break up still quicker... and so on towards catastrophic (explosive) destruction

[Edited 2013-02-16 05:54:07]
 
nomadd22
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Did The Feb. 15 Meteorite Course....

Sat Feb 16, 2013 1:33 pm

Quoting jollo (Reply 9):
* the meteor mass is estimated around 10t: an ABM warhead wouldn't to much more than tickle it (unless Russians have nuclear-tipped interceptors: possible but unlikely)

Try 10,000 tons. They're guessing 55 feet across and a 500kt yield.
Anon
 
HaveBlue
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Did The Feb. 15 Meteorite Course....

Sat Feb 16, 2013 7:16 pm

Quoting nomadd22 (Reply 10):
Try 10,000 tons. They're guessing 55 feet across and a 500kt yield.

55' across... and 20,000,000 pounds? That doesn't seem right to me. Am I missing something?
Here Here for Severe Clear!
 
F27Friendship
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Did The Feb. 15 Meteorite Course....

Sat Feb 16, 2013 8:08 pm

I think they said they intercepted a chunck that had come off, not the main thing itself
 
nomadd22
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Did The Feb. 15 Meteorite Course....

Sat Feb 16, 2013 8:31 pm

Quoting HaveBlue (Reply 11):
Quoting nomadd22 (Reply 10):
Try 10,000 tons. They're guessing 55 feet across and a 500kt yield.

55' across... and 20,000,000 pounds? That doesn't seem right to me. Am I missing something?

Just some third grade math. Figure 100,000 cubic feet at 200 pounds each. That's very rough, but in the range. 10 tons is only about 3 cubic meters.

[Edited 2013-02-16 12:35:28]
Anon
 
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kc135topboom
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Did The Feb. 15 Meteorite Course....

Sat Feb 16, 2013 11:00 pm

It is highly unlikely that Russia, the US, or anyone else could have intercepted a meteor given the speed of the meteor, even at its slowest speed when it explodes itself. Also, there are no rocket/missile plumbs climbing towards the object.

The old USSR could not intercept the (SAC) SR-71, which "only" flew at Mach 3+. The Russians have not advanced their AAW capability and technology that much to be alerted in time enough to have time to launch, much less a tracking and missile speed capability to accomplish this kind of intercept.

I suspect the Russian still could not intercept the SR-71.
 
Acheron
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Did The Feb. 15 Meteorite Course....

Sun Feb 17, 2013 12:13 am

Quoting KC135TopBoom (Reply 14):
The old USSR could not intercept the (SAC) SR-71, which "only" flew at Mach 3+. The Russians have not advanced their AAW capability and technology that much to be alerted in time enough to have time to launch, much less a tracking and missile speed capability to accomplish this kind of intercept.

I suspect the Russian still could not intercept the SR-71.

Then you haven't kept up with Russian AD systems. Nowadays the SR-71 is well within their interception capabilities.

A meteorite?.
Thats a complete different matter. The russians have denied launching any missiles towards it, anyway.

Also, there are reports of meteorite sightings in Cuba today.

[Edited 2013-02-16 16:15:05]
 
checksixx
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Did The Feb. 15 Meteorite Course....

Mon Feb 18, 2013 4:12 am

Quoting Acheron (Reply 15):
Then you haven't kept up with Russian AD systems. Nowadays the SR-71 is well within their interception capabilities.

It also had to do with altitude. They don't have anything that could touch it even now when combined with speed at altitude.
 
jollo
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Did The Feb. 15 Meteorite Course....

Mon Feb 18, 2013 2:08 pm

Quoting nomadd22 (Reply 10):
Try 10,000 tons

Of course you're right: a 16m diameter sphere is a bit over 2000 cubic meters. If mass was 10t, the meteroid woud have been 200 times less dense than water: no way. On the other hand, a 16m sided cube is a bit over 4000 cubic meters; at 10000t, density would be roughly 2,5t per cubic meter (between granite and limestone): much more likely.

Thanks for the correction. The argument stands: an ABM warhead (kinetic or explosive) would at most scratch a 10000t rock.
 
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bikerthai
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Did The Feb. 15 Meteorite Course....

Mon Feb 18, 2013 2:31 pm

Quoting KC135TopBoom (Reply 14):
Also, there are no rocket/missile plumbs climbing towards the object.

No but but the rock would be glowing something fierce when it enters the atmosphere. And though it is going very fast, the trajectory is very predictable. The question is whether you can pick it up soon enough. I though they were supposed to have tracked all the near earth object of significant size anyway. How did they missed this one. Or did they know it all the time and not informed us for fear of panic?

Quoting KC135TopBoom (Reply 14):

The old USSR could not intercept the (SAC) SR-71, which "only" flew at Mach 3+.

Yeah, but at Mach 3+ that can change direction if it sense that it is being followed or tracked, targeting it is a little more difficult.

Quoting jollo (Reply 17):
meters; at 10000t, density would be roughly 2,5t per cubic meter (between granite and limestone):

Have they analyzed the chunks? Some meteors can just be conglomeration of dust and ice particles and would not be as heavy. Although, they probably can guess the weight by analyzing the gravitational trajectory of the object.

bt
Intelligent seeks knowledge. Enlightened seeks wisdom.
 
jollo
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Did The Feb. 15 Meteorite Course....

Mon Feb 18, 2013 3:55 pm

Quoting bikerthai (Reply 18):
Have they analyzed the chunks?

I believe only very small fragments have been recovered so far, perhaps enough for a meaningful analysis, perhaps not. A more substantial chunk probably fell in a lake, leaving a nice round hole in the surface ice, but they haven't gotten to it so far. This seems to confirms my early opinion that practically 100% of the damage and casualties were caused by the shockwave.

Lesson learned: if you are indoors and see a big meteor trail in the sky, stay away from windows!

This event also looks like a convincing "proof" of how a Tunguska-type object (roughly double the size, "surviving" longer to atmospheric entry and "exploding" at a lower altitude) can cause significant damage on the ground without leaving any sizeable crater.

[Edited 2013-02-18 08:57:25]
 
rwessel
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RE: Did The Feb. 15 Meteorite Course....

Tue Feb 19, 2013 7:28 am

Quoting bikerthai (Reply 18):
No but but the rock would be glowing something fierce when it enters the atmosphere. And though it is going very fast, the trajectory is very predictable. The question is whether you can pick it up soon enough. I though they were supposed to have tracked all the near earth object of significant size anyway. How did they missed this one. Or did they know it all the time and not informed us for fear of panic?

It's an ongoing effort, and 15m is not on anyone's scale of objects of significant size. As of last year, the estimate was that some 20-30% of potentially hazardous objects larger than 100m have been found, and of the objects bigger than 1km, some ~80% have been found. While there are a fair number of objects that have been found in the 15m class, the found objects would be a tiny fraction of the number actually out there. Unless exceptional speeds are involved, you can't even get a non-zero Torino scale rating for a 15m object.
 
nomadd22
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RE: Did The Feb. 15 Meteorite Course....

Tue Feb 19, 2013 12:32 pm

Quoting KC135TopBoom (Reply 14):
The old USSR could not intercept the (SAC) SR-71, which "only" flew at Mach 3+.

The problem with that wasn't so much speed as altitude. Their air was too thin for control surfaces on SAMs or Mig-25s to work. They sent both the MIGs and SAMs on ballistic shots trying to get close enough to score a hit. It took about a hundred chance aimed missiles to bring Powers' U-2 down that way.
Not that anything they have would have put a scratch on that rock anyhow.
Anon
 
jollo
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RE: Did The Feb. 15 Meteorite Course....

Wed Feb 20, 2013 12:36 pm

Quoting rwessel (Reply 20):
Unless exceptional speeds are involved, you can't even get a non-zero Torino scale rating for a 15m object.

Quite rightly so: the 15/02 event experimentally "confirmed" (kind of) that such objects do not cause severe ground damage. Now, replacing thousands of broken windows may be expensive, and injuries caused by window fragments can be severe, painful and even crippling: for anyone affected the aftermath cannot be dismissed lightly. However, compared to the damage 50m objects (above 150000 t) can cause, it's understandable that current "space defence" systems (e.g. Sentry) draw the line somewhere in between. NEOs under 50m are just too numerous and too hard to detect and track with current technology and investment level. Perhaps when Planetary Resources and DSI will have fleets of space-based survey telescopes in orbit, searching 24/7 for NEOs, things could change.

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