Yeah those are the really bad ones.. but still if this thing had come in at a steeper angle and exploded at a lower altitude it could have leveled that small city instead of the relatively minor damage that did occur.
Russian scientists say the meteor weighed about 10 tonnes before it entered the Earth's atmosphere, travelling at some 30km (19 miles) per second, before breaking apart 30-50km (20-30 miles) above ground.
However, the US space agency Nasa said the meteor was 17m (55ft) wide and weighed 10,000 tonnes before entering the atmosphere, releasing about 500 kilotons of energy. The atomic bomb dropped on Hiroshima in 1945 was 12-15 kilotons.
"Here is what we know so far," says Bill Cooke, head of NASA's Meteoroid Environment Office. "The asteroid was about 17 meters in diameter and weighed approximately 10,000 metric tons. It struck Earth's atmosphere at 40,000 mph (18 km/s) and broke apart about 12 to 15 miles (20 to 25 km) above Earth's surface. The energy of the resulting explosion was in the vicinity of 500 kilotons of TNT."
They decided to tackle the problem with brute computational force, running simulations of billions of possible orbits to find the ones most likely to have led to a collision. They then used the average of the ten best orbits to search a NASA asteroid catalogue for known objects on similar paths. They found about 20, ranging in size from 5 to 200 metres across, they report in an article to be published in Monthly Notices of the Royal Astronomical Society: Letters1.
The best sibling candidate, for instance, is a 200-metre-wide asteroid known as 2011 EO40, whose orbit was calculated from observations taken over just 34 days. That is too short a time to be able to pinpoint its position in the future, says Jon Giorgini, a senior analyst in the Solar System Dynamics Group at NASA's Jet Propulsion Laboratory in Pasadena, California. For that, researchers would need observations taken over the asteroid's two-year orbit, he says.
The only way to prove a connection would be to collect samples from one of the proposed family members and compare them with meteorites collected from the Chelyabinsk region, says Carlos de la Fuente Marcos. However, a cheaper way to find out whether the suspected siblings have at least a passing resemblance could be to measure their composition from their light spectra.
Chelyabinsk meteoroid -----> meteor -----> meteorite, was estimated to be 18.0m in diameter as it entered into Earth's atmosphere before fragmenting above Russia.