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Meteorite crash in Russia

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Re: Meteorite crash in Russia

#131

Post by cmsmith »

jandrewrogers wrote: post #44
eksith wrote: post #22

Earlier quoted context omitted.

A meteorite would be hypersonic when first entering the atomsphere and then supersonic the rest of the way until maybe a few hundred meters before impact. Besides that, if it's not a solid iron-nickle meteorite, it may even breakup or explode well above the surface instead of staying intact. It's not quite like taking out a satellite in low Earth orbit in that there's plenty of information on its orbit, trajectory, t…

I don't know about "taking it out" per se but an air defense system designed to hit ballistic missiles in the terminal phase could also hit an inbound meteorite. It is within the performance envelope of those types of systems. That said, against a meteorite it won't do much good since it is an inert mass. It is plausible that the Russians launched an interceptor just to be safe. If it is a meteor, it neither hurts no…

>It is within the performance envelope of those types of systems.

Is this true? Reentry speed of an ICBM is something like 5 km/s. Entry speed of a meteor is a minimum of 11 km/s, and more like 25 km/s if this object wasn't in an Earth-like orbit to begin with. Missile interceptors travel much slower than either, and they have a tough time hitting ICBMs from what I understand.

Re: Meteorite crash in Russia

#132

Post by johncoltrane »

ics wrote: post #10
apaprocki wrote: post #3

It takes events like this to highlight how awesome it is to have a large number of people constantly recording video. Integrated dashcams with a circular buffer should become ubiquitous standard equipment IMO. 1080p of first clip available on YouTube: https://www.youtube.com/watch?v=7c-0iwBEswE

Does everyone in Russia have a dashcam or something? It seems like every other video I see on YouTube was recorded on one, and yet I don't know of anyone in Japan or the US with one installed (parking cams don't count). It's a great idea– I would probably get one if I still had a car, but it's amazing to me just how prevalent they seem in Russia. (Elsewhere too? I don't know. I'd love it if someone could enlighten me…

Here is an extremely frightening dashcam video of the 2011 tsunami in Japan:

http://www.youtube.com/watch?v=NgNnZgXVZVk

Re: Meteorite crash in Russia

#133

Post by laumars »

mmastrac wrote: post #31

Here's a collection of insane videos of the event, some with the enormous sonic boom: http://www.youtube.com/watch?v=XIAm5hq8WWc http://www.youtube.com/watch?v=b0cRHsApzt8 http://www.youtube.com/watch?v=Np_mpGYSBSA Can anyone translate what they are saying in the first one? You can get a good idea of the new videos being posted using YouTube's "last hour" filter: http://www.youtube.com/results?search_query=%D0%BC%D0%…

This one is rather impressive to watch as well: http://www.youtube.com/watch?v=7c-0iwBEswE

Re: Meteorite crash in Russia

#134

Post by Lewton »

ics wrote: post #10
apaprocki wrote: post #3

It takes events like this to highlight how awesome it is to have a large number of people constantly recording video. Integrated dashcams with a circular buffer should become ubiquitous standard equipment IMO. 1080p of first clip available on YouTube: https://www.youtube.com/watch?v=7c-0iwBEswE

Does everyone in Russia have a dashcam or something? It seems like every other video I see on YouTube was recorded on one, and yet I don't know of anyone in Japan or the US with one installed (parking cams don't count). It's a great idea– I would probably get one if I still had a car, but it's amazing to me just how prevalent they seem in Russia. (Elsewhere too? I don't know. I'd love it if someone could enlighten me…

This: http://www.youtube.com/watch?v=YWvG4KAYJfY is why

Re: Meteorite crash in Russia

#135

Post by stuaxo »

cabirum wrote: post #122
rdl wrote: post #45

I don't get why everyone seems to be running out of (what appear to be) fairly sturdy concrete buildings and into the street. Sure, a building won't protect you from an incoming meteorite of any size, but being indoors might protect from fragments if an incoming meteor hits something else.

thats how it looks from the inside of buildings: http://www.youtube.com/watch?v=Fs6sj6xAzeg

Leg it !

Re: Meteorite crash in Russia

#136

Post by abcd_f »

creamyhorror wrote: post #64
mmastrac wrote: post #31

Here's a collection of insane videos of the event, some with the enormous sonic boom: http://www.youtube.com/watch?v=XIAm5hq8WWc http://www.youtube.com/watch?v=b0cRHsApzt8 http://www.youtube.com/watch?v=Np_mpGYSBSA Can anyone translate what they are saying in the first one? You can get a good idea of the new videos being posted using YouTube's "last hour" filter: http://www.youtube.com/results?search_query=%D0%BC%D0%…

Here's a great dashcam video that captures the meteor arcing across its field of vision and lighting up the scene more brightly than the sun like a nuclear blast (first submitted to HN by dennisgorelik). I almost thought it was a hoax, and even tried to examine the video for signs that it was CGI. http://www.youtube.com/watch?v=tJOJ6B2XOyA The guy doesn't even say anything for a long while, just starts speeding up. e…

The RT article quote local (military) newspaper as saying "A missile salvo blew the meteorite to pieces at an altitude of 20 kilometers".

I wonder if it's true.

Re: Meteorite crash in Russia

#137

Post by lutusp »

abcd_f wrote: post #136
creamyhorror wrote: post #64

Earlier quoted context omitted.

Here's a great dashcam video that captures the meteor arcing across its field of vision and lighting up the scene more brightly than the sun like a nuclear blast (first submitted to HN by dennisgorelik). I almost thought it was a hoax, and even tried to examine the video for signs that it was CGI. http://www.youtube.com/watch?v=tJOJ6B2XOyA The guy doesn't even say anything for a long while, just starts speeding up. e…

The RT article quote local (military) newspaper as saying "A missile salvo blew the meteorite to pieces at an altitude of 20 kilometers". I wonder if it's true.

Not true. Other, more plausible, reports say the meteorite is now located in a crater west of Chelyabinsk.

Re: Meteorite crash in Russia

#138

Post by abcd_f »

carbon8 wrote: post #37
mmastrac wrote: post #31

Here's a collection of insane videos of the event, some with the enormous sonic boom: http://www.youtube.com/watch?v=XIAm5hq8WWc http://www.youtube.com/watch?v=b0cRHsApzt8 http://www.youtube.com/watch?v=Np_mpGYSBSA Can anyone translate what they are saying in the first one? You can get a good idea of the new videos being posted using YouTube's "last hour" filter: http://www.youtube.com/results?search_query=%D0%BC%D0%…

Two more good videos (high quality, trail/train detail, booms, etc): http://www.youtube.com/watch?v=XDqYclzto7k http://www.youtube.com/watch?v=0ozSq3yEm3g

Sonic boom followed in 2 minutes, so the altitude was in 30-40km range. That's damn impressive, with all the sharp shadows from the buildings ... damn.

Re: Meteorite crash in Russia

#139

Post by tripzilch »

ics wrote: post #118
apaprocki wrote: post #17

Earlier quoted context omitted.

It's a byproduct of Russians using them to combat corruption and scammers on the road. It's a fad that caught on based upon the underlying need. In the US most citizens don't have that underlying need. The cops, on the other hand, do have burden of proof and liability concerns, so police cars do have them. If the average citizen could be extorted on the highway they'd start to catch on here too :)

> If the average citizen could be extorted on the highway they'd start to catch on here too :) Actually, after having driven tens of thousands of miles on the interstates a number of years ago I think they would be a tremendous improvement on rest stop safety at the very least. That may be better served by an omnidirectional parking cam (and it would have to be running all the time, or you would need to flip it on),…

Possibly. From a privacy pov, I suppose I'd also prefer a decentralized option like this, where everybody just gets their own small slice of all the data instead of one government collecting all of it in a centralized location. It might be slightly less efficient, but in general it's a better way of roughly getting the data just where it needs to be, as long as it needs to be.

Also note that the thing that caught on = something with a rather direct very personal advantage to the adopter, while your suggestion (that hasn't caught on) = something that personally helps against very rare events and sort of increase ambient security for everyone. Some lesson about human nature, here :)

Re: Meteorite crash in Russia

#140

Post by spitx » 

  9:36 GMT: There is a high chance that another 
  meteorite could enter the Earth’s atmosphere in 
  the next few hours, Sergey Smirnov from Pulkovo 
  Observatory told Vesti news channel.
  
  9:07 GMT: "The object could be about a meter
  in diameter and weigh a few tons,” Valeriy Shuvalov
  of the Institute of Geosphere Dynamics told 
  RIA-Novosti. 
  “As it entered the atmosphere, it broke into a 
  cloud of pieces that flew on, creating a blast wave 
  and emitting light. That's where the flashes came 
  from, as well as broken windows. Most of the 
  object’s material evaporated, the remaining pieces
  slowed down and fell. It was most likely of iron 
  nature as it penetrated so far through the 
  atmosphere. 
  However, we still don't have the exact data on 
  the debris."
Source: http://rt.com/news/russia-meteor-meteorite-asteroid-chelyabi...
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