"Chelyabinsk Mega-meteor: Status Report
Although the cosmic intruder that exploded over Russia on February 15th had an estimated mass of 10,000 tons, less than 200 kg of it has been recovered to date.
Four months have passed since the early-morning bustle in and around Chelyabinsk, Russia, was shattered by a powerful cosmic explosion high in the sky. As reported here
hours after the blast and
in the days thereafter, the intruder was a stony object about 54 feet (17 m) across that had
a mass of roughly 10,000 tons. Windows shattered in 7,000 buildings as a powerful blast wave engulfed the area, and some 1,700 people were injured (most by flying shards of glass)..."
http://www.skyandtelescope.com/commu...212987401.html