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Blazing Meteor Fireball Injures 400 In Russia!
rp_photo wrote: I'm not a native Russian language speaker so my translation might be a bit off but these are my translations of expletives I heard in the various videos of the meteor. Feb 15 13 07:38 pm Link For those of you who can't get the basic facts about this straight, here they are: The Russian meteoroid was estimated to be about ten tons. That makes it only a few yards in diameter. It entered the atmosphere (becoming a meteor) at about 33,000 mph, broke up in the atmosphere between 18 and 30 miles up, and released the energy equivalent of about 3 kilotons. Asteroid 2012 DA14 is estimated to be about 130,000 tons and about 50 yards in diameter, travelling about 28,500 mph. If it had collided with the Earth it would have released the energy equivalent of about 3.5 megatons - roughly 1000 times that of the Russian bolide. The crater in the ice-covered lake was reported as being about 6 meters in diameter. Feb 15 13 07:42 pm Link Austin IMagemaker wrote: It missed, just as expected. Feb 15 13 07:46 pm Link Lawrence Guy wrote: Described by NASA as a "tiny asteroid," the meteor's explosion created a blast in central Russia equivalent to 300,000 tons of TNT, the space agency's officials said Friday, adding that the incident was a once-in-100-years event. Feb 15 13 07:46 pm Link Lohkee wrote: ... Feb 15 13 07:58 pm Link 10 (metric) tons = 10000 kg 33,000 mph = 14,750 m/s 1/2 mv^2 = 1087812500000 joules 1 ton of TNT (equivalent) = 4.184 Gj = ~300 TONS of TNT, or 0.3 kt. I'm voting that the 300 kt is a reporting error, using kt when the actual value is in tons, and that the 3kt report from earlier in the day was ALSO a reporting error, but only off by one order of magnitude instead of 3. EDIT: It seems that one guy at the University of Western Ontario is claiming that this thing was 50 feet in diameter and 7,000 tonnes, with a 300 kt energy. Feb 15 13 08:05 pm Link *pauses to recalculate* Feb 15 13 08:08 pm Link Ha! Now I look like an idiot! http://www.nasa.gov/mission_pages/aster … 30215.html In my defense I was going from the reports I saw this morning, and didn't know that the estimates had been revised. It also looks like the 10-ton number that was given to the media was pulled out of someone's ass. Seriously, a three order of magnitude error? Gah! EDIT: They're saying ~500 kts now. Feb 15 13 08:32 pm Link Digital Photo PLUS wrote: LMAO Feb 15 13 08:46 pm Link My friend Oksana said that her family and friends in Kirov clearly saw this and felt the shockwaves... This really was a big one,again,the one thing that saved the impact area from a devestating strike was the object's make up...more iron would have meant a deeper penetration into the atmosphere,and the explosion would have been much closer to the surface,which would have caused the nuclear weapon detonation like destruction like Tunguska Feb 16 13 07:11 am Link You're all getting all 3 rock bodies confused... Feb 16 13 08:46 am Link well - if you want to have some fun trying to wreck the earth http://impact.ese.ic.ac.uk/ImpactEffects/ You can plug in the parameters of yesterdays event and get some readouts of their program's results - and they match up fairly well for a dense stone/iron object at about 9 miles/s. (the observed effects are too harsh for stone and too mild for iron) Or, you can see just how hard it is to get a crater forming impact without having some atmospheric breakup. (it's apparently harder than you might think.) Feb 16 13 09:00 am Link Vintagevista wrote: That's cool! Feb 16 13 11:06 am Link Jim Ball wrote: Isn't it? It's a hell of a thing to design a rock and have the system reply - "Broke up in the atmosphere" Feb 16 13 12:59 pm Link Vintagevista wrote: Heh..I always go for the extreme..25 mile wide ball of Iron Feb 16 13 01:47 pm Link By the way - Why is it that so many Russian vehicles have dash-cams? Feb 16 13 02:08 pm Link Guss W wrote: CNN explained this... Feb 16 13 02:10 pm Link The shock wave registered a 4.0 on the Richter scale Feb 16 13 02:13 pm Link " Based on preliminary calculations, the solar system interloper that shook Chelyabinsk weighed about 7,000 tons and was about 50 feet in diameter when it entered the atmosphere at 40,000 miles per hour at about 9:20 a.m. local time, said Peter G. Brown, a professor of physics at the University of Western Ontario. Dr. Brown based his calculations on low-frequency sound waves that traveled as far as Alaska. A worldwide network of such sensors listens for these vibrations, too low to be heard by humans, to verify the ban on nuclear tests. Russian experts estimated a much smaller size, of just 10 feet across and 10 tons. " http://www.nytimes.com/2013/02/16/scien … From Space - New York Times ETA: "The asteroid was impossible to detect, Dr. Cooke said, because it was approaching from the dayside. “And as you know, telescopes can’t see [dark objects in outer space] during the daytime,”" Feb 16 13 02:31 pm Link I don't understand what causes the explosion. I would understand it gradually burning up and leaving a long trail. I would also understand it hitting the earth and that causing an explosion. But how does all of the energy in it get released all at once while it is still descending to create the flash and the "kaboom"? Feb 16 13 04:25 pm Link Too bad we don't have any actual Russians around here who could answer questions or lend perspective to things Feb 16 13 04:49 pm Link John Sweet wrote: Primarily a sonic boom on a particularly huge scale since the body was traveling about 10 times faster than the fastest aircraft and had far more surface area to generate shock waves. Feb 16 13 04:59 pm Link rp_photo wrote: I'm not buying that. Feb 16 13 05:49 pm Link John Sweet wrote: How so? Feb 16 13 06:42 pm Link Lawrence Guy wrote: Because it clearly exploded. Feb 16 13 06:45 pm Link .. Feb 16 13 06:45 pm Link John Sweet wrote: Brief history of a meteor Feb 16 13 06:57 pm Link Yeah, this sounds like a variation on some stuff I've been reading elsewhere. A good discussion of theories here: http://scienceblogs.com/startswithabang … r-explode/ Feb 16 13 08:09 pm Link Gotta love wikipedia. There's already a full-blown article with 61 footnotes. Feb 16 13 09:09 pm Link These video links are from the above Wiki link. They are the first I have "heard" the sonic boom....... about 2+ minutes after the flash was seen. http://www.youtube.com/watch?v=w6uOzFo2MQg http://www.youtube.com/watch?v=w6uOzFo2MQg These folks must have been freaked. They live in a region known primarily for manufacturing weapons for the old Soviet block, from tanks to nuclear bombs... if there was any of the old cold war paranoia left over, they probably thought they were under attack. Feb 16 13 09:50 pm Link What's really cool is that some of the videos pick up on the continuing series of sonic booms that followed. Just as the length of the thunder from a lightning strike is somewhat dependent on the length of the bolt and your aspect to it. A hypersonic rock breaking up - will produce a series of booms along the length of the track. Since you are at a fixed point - it takes longer for some of the booms to reach you Here's the best illustration I has seen - the fireball is at about :30 and it takes 2 minutes for the sound waves to get there - and you can see and hear the multiple booms going on for some time. http://www.youtube.com/watch?v=5kN9tC5Lv6k Another good one http://www.youtube.com/watch?v=1P521pXW6Qo Feb 16 13 09:55 pm Link John Sweet wrote: When you enter the Earth's Atmosphere...it causes friction. It broke apart...and the sonic boom..was Sound...like the Concorde did..as it reach a certain speed..there would be a sonic boom. This Meteor was travling 33,000 mph...that is what caused the sonic boom as it enter the earth's atmosphere. Feb 16 13 09:57 pm Link Vintagevista wrote: What I find interesting is how that corresponds to descriptions of the Tunguska event which said it sounded like cannon fire. Feb 16 13 11:12 pm Link Telescopes is one thing,what about all the trillions been spend on so-called space watch programs,radar technology.Wehn iy happened,HMMMMMOOOOOPS.al of a sudden the guys in white jackets come up with a very simple explanation.Nope we could not see it with our telescopes.Hmmmmmmmm,where is all the money then from all the years of research and what ever.Makes one think. Feb 17 13 04:40 am Link Guss W wrote: My favorite ones were the ones about Tesla having a big oopsie,an alien ship fired a nuke at us,amongst others Feb 17 13 06:37 am Link John Sweet wrote: It's not a single event but a wave trailing the moving object. Imagine a boat passing close to the shore, the wake of the boat is continuous but to an observer on the shore the wake hitting the shore is a single event. This is the idea behind the sonic boom caused by airplanes accelerating pass the speed of sound. Sound is basically little ripples traveling through air with a constant speed that they cannot exceed. When a body starts moving faster than sound, those ripples cannot get out of each other's way fast enough so they bunch up adding their individual energy into one shock wave. Feb 17 13 06:55 am Link KOLMANS STUDIOS wrote: This one came from the day side and telescopes don't work that well in daylight so we may need to spend even more money to figure out a way how to find them in the sky during the day. Feb 17 13 07:02 am Link People. People. People. Stop your calculations. There's a reason you can't figure out if it's a 5 meter rock or a 50 meter rock. It wasn't a rock. The United States isn't the only country with people who ignore mainstream media which conspires to tell you what the government wants you to think is the truth. Russia also has people who cut past the bull to speak the truth. Obviously it wasn't a rock. It was a US weapons test!!! http://www.slate.com/blogs/the_slatest/ … ually.html Feb 17 13 07:52 am Link ArtisticPhotography wrote: I see Russia has freaking nuts...is the Republican Party in Russia? Lame Feb 17 13 07:54 am Link I must be crazy or dyslexic or something because I somehow read the title as Blazing Meatball Injures 400 In Russia! Feb 17 13 08:34 am Link |
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