How Close and How Big
This asteroid will pass about 17,000 miles from the surface of the earth. At it nearest point it will be closer than the moon and will travel inside the orbit of some satellites. When it does so the space rock will be nearest the South Pacific nation of Sumatra. This asteroid is estimated to be about 150 feet in diameter, which is approximately the same size as the one that hit the Siberian region of Russia in 1908. No ill effects are expected from tomorrow’s flyby.
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This very same asteroid has an elliptical orbit around the sun and so it will pass by the earth again in another seven years, but it is not expected to hit the earth at this time, either. If an asteroid of this size were to strike the earth, it is estimated that the damage would be similar to the Tunguska Event of 1908 that has already been mentioned above.
Thanks to the internet and modern astronomical observing technology this close passby can be viewed via several different webcasts. These include our very own NASA, along with the Slooh Space Camera, Virtual Telescope Project (Italy) and Bareket Observatory (Israel). The NASA link gives amateur astronomers a chance to track the fast-moving object with a good pair of binoculars or a small telescope. The asteroid will first appear in the southern hemisphere near the Southern Cross and this point it will shine at its brightest.
Eventually, the space object will be visible in the Northern Hemisphere between the Big and Little Dippers, but by this time the high speed traveler will be much dimmer.