[meteorite-list] Divers Find Russian Meteorite Craters in Chebarkul Lake

From: Ron Baalke <baalke_at_meteoritecentral.com>
Date: Wed, 27 Feb 2013 08:29:56 -0800 (PST)
Message-ID: <201302271629.r1RGTuft002256_at_zagami.jpl.nasa.gov>

http://rt.com/news/russian-meteorite-lake-craters-537/

Divers find Russian meteorite craters in Chebarkul Lake
rt.com
February 27, 2013

Divers searching Chebarkul Lake in Russia's Urals region have found
several craters that may be the impact zones of fragments of the
now-famous meteorite that exploded over the area on February 15.

The underwater hunt for the rare stones was hampered by cold weather and
light-obstructing mud stirred up from the bottom. The divers used
powerful lights and probes to uncover several potential sites where
meteorite fragments may have landed.

On Thursday, a team from Ekaterinburg will join in the search by
conducting a magnetic survey of the prospect locations; the initial
results could be ready as early as that evening.

Some fragments of the meteorite were retrieved in the Chelyabinsk
region, which endured the bulk of the spectacular cosmic event. The
biggest meteorite chunk discovered was about 1 kilogram. It is hoped
that the fragments inside the lake could be much bigger, weighing dozens
of kilograms.

Videos of the meteorite streaking across Russia's sky proved to be not
only awe-inspiring for YouTube, but also served a scientific purpose:
Two groups of researchers used the clips to calculate the meteorite's
trajectory.

Colombian astronomers from the University of Antioquia in Medellin are
believed to be the first to report their preliminary results last week
at the scientific publishing website arxiv.org. A similar work by
researchers at the Astronomical Institute of Czech Academy of Sciences
came days later on Monday.

Both teams used the proven method of analyzing video footage of the
meteorite's descent through a little bit of trigonometry. This time,
however, the footage was taken by CCTV, car cameras and smartphones,
rather than precisely calibrated observatory recorders.

The Russian meteorite was determined to be an Apollo-class asteroid, one
of an estimated 5,000 near-Earth bodies orbiting the Sun and
occasionally crossing the Earth's orbit. Most of these objects are
spread out between the orbits of Venus and Jupiter.

Russian astronomers will report their findings later in March, but have
already confirmed that the results published by the Columbian and Czech
researchers correspond with their findings.
Received on Wed 27 Feb 2013 11:29:56 AM PST