For anyone disappointed that Mars isn't going to get whacked by a chunk of space rock after all, here's a bit of consolation: Another asteroid, 2007 TU24, is going to pass close by the Earth on Jan 29. No, don't worry, we ain't all gonna die. It will miss us, but should be visible with an amateur telescope.

Asteroid to Make Rare Close Flyby of Earth January 29

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Scientists are monitoring the orbit of asteroid 2007 TU24. The asteroid, believed to be between 150 meters (500 feet) and 610 meters (2,000 feet) in size, is expected to fly past Earth on Jan. 29, with its closest distance being about 537,500 kilometers (334,000 miles) at 12:33 a.m. Pacific time (3:33 a.m. Eastern time). It should be observable that night by amateur astronomers with modest-sized telescopes.
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Asteroid 2007 TU24 will reach an approximate apparent magnitude 10.3 on Jan. 29-30 before quickly becoming fainter as it moves farther from Earth. On that night, the asteroid will be observable in dark and clear skies through amateur telescopes with apertures of at least 7.6 centimeters (3 inches).