Chelyabinsk meteorite continues to be on the pages of print and online publications. Many theories, guesses speaks research centers around the world.
Will we ever, What really was a meteorite Tchebarkul ?
Finnish scientists from the project on air radiosonde KAIRA defined radiant Chelyabinsk car — a place on the celestial sphere where the terms of the terrestrial observer flew cosmic body — it is located in the constellation Pegasus, according to the website of the project.
On the same day in the evening of 27 thousand kilometers from Earth asteroid flew in 2012 DA14, so once there were a relationship between these two events. However, astronomers have stated that they are two different cosmic bodies, which are not connected to each other. This is confirmed by calculations made by experts KAIRA (Kilpisjdrvi Atmospheric Imaging Receiver Array), who were engaged in radiolocation asteroid.
"Asteroid 2012 DA14 was approaching Earth from the south, flying past the Earth and went to the north. However, Chelyabinsk car came from the other direction, from the point of view of an observer located in the city, its radiant was above and to the left of the Rising Sun "- said in a statement.
According to estimates of Finnish researchers, radiant Chelyabinsk car had the right ascension (longitude on the celestial sphere) for 22 hours and declination (latitude) — +20 degrees. This point is located in the constellation of Pegasus, to the right of the constellation Cygnus
Russian scientists do not rule out that over the Urals exploded not a meteorite, but a comet
"In Chelyabinsk, we have seen it is a variant of the comet, in which almost no meteoritic material inside. Main — a block of ice, it does not remain on the tracks "- suggested leading researcher of space astrometry Institute of Astronomy Alexander Bagrov reporters.
He noted that according to the official doctrine, which is supported by the Western scientific community to Earth from time to time falling asteroids.
However, he said, there is a hypothesis that ancient giant craters on Earth were formed not falling asteroids. "None of the wound was not stellar fragments of meteorite content. Rather, they were caused by comet impact, "- said Bagrov.
This view, however, is controversial. Another participant in the conference — the deputy director of the State Sternberg Astronomical Institute of Moscow State University Sergey Lamzin noted that, according to the research group working at the crash site of the Ural car, debris classified as carbonaceous chondrites, which is typical for meteorites.
"Clearly it was said that this is typical of carbonaceous chondrites, as I imagine it, it's still not a comet," — said S.Lamzin. Another panellist, director of the Institute of Applied Geophysics Academician Fedorov Vladimir Lapshin also agreed that the Chelyabinsk phenomenon is more like a meteorite, but said that according to an orbiting satellite "Meteor", recorded the phenomenon typical of a comet.
"Most likely, it's a meteor, however, devices that are installed on our satellite, shown during the passage of the meteorite through the orbit of an increase in the amount of water," — said Lapshin.
He explained that the comet is not necessarily entirely icy body, and the decay of comets may arise meteor streams and fragments of refractory material can fall back to Earth. "When it comes to the findings of meteoritic matter — it could be the intrusion" — suggested Lapshin.
NASA: The power of explosion Chelyabinsk car was 470 kilotonnes
The amount of energy released during the explosion of the car over Chelyabinsk, corresponded to 470 kilotons of TNT equivalent weight of this cosmic body ranged from 6.4 to 7.7 million tons, and the size — about 17 meters, said Lindley Johnson, manager of NASA, is engaged in research Near-Earth objects.
Previously, NASA specialists evaluated by the explosion of 500 kilotons (30 powerful bombs exploded in Hiroshima), and the mass of the cosmic body — to 10,000 tons .. Estimating the size remains the same — 17 meters.
Speaking at a meeting in Vienna of the UN Committee on the Peaceful Uses of Outer Space, Johnson also said that the Chelyabinsk fireball entered the atmosphere at a speed of 18 kilometers per second, and the explosion occurred at an altitude of 10 to 20 kilometers.
This space object, he said, belonged to the "Apollo" — so astronomers call a group of asteroids near Earth, whose orbit similar to the orbit of the asteroid Apollo: semi-major axis greater than 1 astronomical unit (which is equal to the average distance from the Earth to the Sun) but the distance to the Sun closer than the closest approach to the Earth and the Sun.
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The U.S. space agency (NASA) estimated the weight Chebarkulsky meteorite that exploded over the February 15 Chelyabinsk region, 10 thousand tons.
According to their calculations the energy that disconnects in the explosion of a celestial body, equal to 500 kilotons, that is 30 times higher than the power of the bomb dropped on Hiroshima.
NASA experts believe that the meteorite's second largest after the Tunguska. Similar phenomena can be expected about once every 100 years.
Telescopes could not see the car because of the Chelyabinsk sunshine
Chelyabinsk astronomers to pinpoint the car could not as a cosmic body flew from the Sun and telescopes do not see it in the sunshine, said deputy director of the Sternberg Astronomical Institute of Moscow State University named after Sergei Lamzin.
'Discover it was not because he was flying from the Sun. But if he was flying at night, our network of telescopes MASTER could detect it, "- said Lamzin.
MASTER telescopes can monitor the bursts in the universe, the observation of comets, meteors, debris objects. The system consists of telescopes located in the valley of Tunkinskaya, Moscow region, Kislovodsk, in the Urals, in Blagoveshchensk.
Lake Tchebarkul could become a tourist attraction
Tchebarkul Lake in the vicinity of Chelyabinsk, where they found the fragments of a meteorite which fell on a Friday, it may become a tourist attraction of international scale, said a member of the Federation Council, Konstantin Tsybko.
"We Chebarkul want to do now is somehow … We are interested from a tourist point of view — just 70 kilometers from the beautiful lake, where a meteorite fell.
Searchers will ride, dive, will try to find (meteorite fragments) ", — said the senator told reporters.
Tsybko also suggested that the fall of the meteorite must be the reason for the return of astronomy in the school curriculum, so that people from an early age can understand the nature of such an emergency.
"Then we must return astronomy (the school)," — said the senator.
Astronomy was excluded from compulsory education in 1993.
Russian astronomers in 2009 were calling back the teaching of this subject in the school and restore astronomical training at pedagogical universities.
On Friday, a meteorite fell in the Urals — PE affected residents of Tyumen, Kurgan, Sverdlovsk regions, as well as the northern territories of Kazakhstan. Major injuries were reported in the Chelyabinsk region, in many buildings shattered windows. Earlier it was reported more than a thousand victims.