Originally posted by apacheman
While the 1999 meteor exploded at a height of 32kms, last night's meteor would have burnt up at a significantly higher altitude, Dr Christie said.
The difference in speed is probably a much larger factor than time in this case,
as it is the speed that is the important factor in kinetic energy. You can see
this in actual meteoroids: fast meteoroids don't make it to the ground and are
gone in a second: slow ones that take seconds or even tens of seconds do make it
and drop meteorites. There, time and distance travelled clearly is not the
factor in the eventual percentage of ablation (as the slow ones taking long
times are the ones that are less ablated in the end): speed is. The slower the
speed, the higher the chance of survival.
With 7.5 km/s at the start, you are actually already close to the speed where
ablation stops (it stops at approximately half that speed). So I suspect that
ablation already isn't that effective at that speed to begin with, compared to
Originally posted by apacheman
"These types of meteors are spotted around the world about once a day and it's just a matter of being in the right place at the right time. It was a lovely clear night last night and it was relatively early, so many people would have seen it."
Once a day globally, eh?
As I've been reporting, there's way more than that just over the US alone.
There is now compelling evidence that an exceptionally large (50-100 km) comet entered a short-period, Earth-crossing orbit some time in the Upper Palaeolithic, and underwent a series of fragmentations. During this disintegration the Earth was probably subjected to occasional episodes of intense bombardment. Such an episode might constitute a sensible astronomical framework for understanding the postulated catastrophe at 12,900 BP. Concentrations of sub- kilometre bodies may still exist in meteor streams and constitute a significant hazard. Such bodies are difficult to detect, and current deflection and mitigation strategies do not seem adequate to deal with them. For larger bodies, a paradox exists in that the number of comets expected to be thrown into Halley-type orbits (periods 20-200 years) is at least two orders of magnitude greater than observed. The fate of these comets is unknown, raising the prospect that a significant population of dark Earth-crossing comets may exist and adding further uncertainty to impact hazard assessments. Discrete bombardment episodes are evident in the well-dated impact record of the past 250 Myr and several coincide with transitions between geological periods. There is evidence that these episodes have a ∼ 35-37 Myr periodicity, which may be connected to Galactic disturbances of the Oort comet cloud. The threshold for periodicity begins for impact craters >∼ 40 km in diameter; since this is also the threshold which impact ejecta create worldwide conflagration, it again implies that comets are a significant, if not dominant, component of the global impact hazard.
it was unlike anything i seen before i was leaning out my window when i seen it, i tried to look for it but there is brush and wooded area nearby. It was enormous the size of softball so im assuming from the distance from me to it, it had to be the size of a basketball when it landed. There was no tail, train or any other type of trail just a round mass the glowed bluish green. It also didn't seem to burn out or shrink in size as it fell just maintained a steady ark.o yes and there was a distinct burning smell in there air but it didn't smell normal like plastic, wood or even metal it was almost like the smell of garbage and gas if that makes any sense to you.
This was a Sentinel Camera Capture at 10:19:43Z, - an additional bolide separate from the 11:47 PM event over Texas. Initial and final Az/Alt estimations are: 246/10 & 241/06 True Azimuth. Concurrent capture on Meteor Scatter from USAF Space Radar at 10:19:50Z . Video can be viewed here: www.facebook.com... Composite image and meteor scatter spectrum can be viewed here: www.facebook.com... Multiple fragmentation in the short event. Sentinel Camera capture. This was a Sentinel Camera Capture at 10:19:43Z, - an additional bolide separate from the 11:47 PM event over Texas. Initial and final Az/Alt estimations are: 246/10 & 241/06 True Azimuth. Concurrent capture on Meteor Scatter from USAF Space Radar at 10:19:50Z . Video can be viewed here: www.facebook.com... Composite image and meteor scatter spectrum can be viewed here: www.facebook.com...
My mom and I were out walking when the meteor inst antly caught our attention. We stayed a few minutes to see if more would follow, but none did. There were two almost sphere-like pieces which broke off and then disintegrated. Both were white in color. I've stayed up quite late and woken up in the wee hours of the morning to watch meteors, and only once have I seen a fireball with a train bright as this. As it appeared it glowed a brilliant white, then gained an almost green hue to it which grew in intensity. The train then began sparking purple flecks that elongated behind it. The meteor came much lower than previous ones, and at the end began letting off am almost ball shaped debris. Each debris piece disintegrated in one, maybe two seconds. As the ball itself disappeared the train glowed almost effervescently.
A lone meteor shot from beneath the moon in my vie w at 10:42PM from the front living room window of the house in Huntsville, Texas. The moon will be full in two days. It was headed in a NW direction which might skirt the west side of Huntsville. It was aflame with a slight aurora about it and a 3 to 4 inch tail.
This was one of the most amazing things I've ever seen!!!!!!! Facinating and exciting! Let me start by saying i was at my cabin sitting on my deck when I heard what I thought was the wind rustling the tops of the trees. It struck me Very odd considering no wind blowing what so ever around me. As I was looking at the tree tops through the trees I saw a massive fireball object falling from what seemed like just over the tree tops from the sky. I even called the local dispatch to report it. This was one of the most amazing things I've ever seen!!!!!!! Facinating and exciting! Just a glowing almost fireball, dark out so no smoke seen
I was driving southbound on Route 84 at 70 MPH goi ng down a long decline, when the I noticed the long train just to the right and 10 to 15 degrees above the treeline. I have seen shooting stars before where the train disappears as fast as the star moves, but this train was wider and remained for a duration of 6 - 8 seconds until the front end broke into two smaller light balls and disappeared. I was very suprised by the duration and brighness and from the angle it was clear that it was moving in almost the same direction as my car was travelling. As it fragmented into 2 fragments it got slightly brighter then disappeared. I have seen shooting stars before where the train disappears as fast as the star moves, but this train was wider and remained fo the duration of 6 - 8 seconds until the front end broke into two smaller light balls and disappeared.
It was extremely huge for a metorite in my opinion and very bright and lasted longer than any I've ever seen. I ran inside and turned the local early morning news on and watched for the next 20 minutes hoping to hear something about it. I saw a bright flash of light but it was at the begining of the event out the corner of my eye it was what caught my attention to it. It was extremely huge for a metorite in my opinion and very bright and lasted longer than any I've ever seen. I ran inside and turned the local early morning news on and watched for the next 20 minutes hoping to hear something about it. I was in such shock from how huge it appeared to be and how high in the color spectrum it was that I didn't notice if there was a trail after it disapeared.
An unknown mass believed to be from outer space on Saturday fell near Kilimambogo and Tala towns. Initially, there were reports of an explosion in Kangundo, Tala, Yatta and Kakuzi before an extra-terrestrial rock fell at around 10 am. Area residents say the loud sound was comparable to a bomb explosion or a crashing aircraft while others felt it was an earthquake. Police and military officers from Thika rushed to the scene at Kiumwiri village, Murang’a county. The military later took away the object for expert analysis. The black smooth rock weighing about five kilos fell at a maize plantation, 60 meters from a nearby homestead, but no one was harmed. Lt Col J.N. Vungo, the commanding officer of the 12th Engineers Battalion, said initial assessment indicate that the object was not manmade and was believed to have come from outer space. “We got conflicting reports from Kilimambogo area indicating that an aircraft had crashed or a bomb had exploded in the area and jointly with the police we mobilised our officers to find out what was happening,” he said. On locating the scene, security personnel sealed off the area, which was attracting curious residents.
“We believe it is a heavenly body, probably a piece of a meteor that may have disintegrated on entering the earth’s atmosphere,” said Lt Col Vungo, who was accompanied by Thika police boss Paul Leting. Mr Vungo said reports from Ndunyu Sabuk area indicated that a bigger object was seen in the skies before it disintegrated after a loud blast. The official said according to witnesses, the object raised a cloud of dust on hitting the ground, was extremely hot and was spinning on impact. “Meteors often lose stability and fly away from their orbit, but they burn out on entering the atmosphere due to friction, Lt Col Vungo said. However, he added that it was a rare occurrence in the East African region. An eye witness Ms Jane Wangui Kibugi said she was only 50 meters away when the object fell. “I saw a cloud of dust and when I went closer I found the black smooth stone, which had dug a hole on the ground,” she said.