A 10-metre wide asteroid is set to pass between the
 earth and moon this summer (June 2) but
scientists claim it is of no threat to the Earth.
Asteroid 2009 BD, which was first observed on 16 January 2009 will pass approximately within 0.9 lunar distances (the distance between Earth and the Moon) of earth. Astronomers believe the rock is a rare “co-orbital asteroid” which follows the orbit of the Earth, not receding more than 0.1 AU (15 million km) away.
While confirming that the asteroid is not a threat to earth, scientists say that if the asteroid were on course to impact earth it would cause a multimegaton atmospheric explosion over Earth’s surface, rather than impacting it. It potentially would be quite damaging (and even lethal) out to distances of 10 to 20 kilometres in all directions if it happened over a populated region with weak structures.

Two asteroids, several meters in diameter and in unrelated orbits, passed within the moon’s distance of Earth, September 8 2010. In April 2010 an asteroid roughly as long as a tennis court zoomed past Earth at about the distance of the moon. The space rock to pass at or within lunar distance previous to this was 2009 JL2, an asteroid about 17 to 37 meters across, in May 2009.
There is a roughly 50 percent chance of a 30-meter-plus asteroid striking Earth each century, according to Clark Chapman, a space scientist at the Southwest Research Institute in Boulder, Colo.

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