On January 29, 2008, an asteroid that is between 500 and 2,000 feet in diameter  will pass within 1.4 lunar distances (334,000 miles  ) of Earth according to NASA's Near Earth Object program (NEO). For a brief time the asteroid will be observable in dark and clear skies with amateur telescopes of 3 inch apertures or larger.
On January 29, 2008, an asteroid that is between 500 and 2,000 feet in diameter (150 - 600m) will pass within 1.4 lunar distances (334,000 miles or 535,000 km ) of Earth according to NASA's Near Earth Object program (NEO). For a brief time the asteroid will be observable in dark and clear skies with amateur telescopes of 3 inch apertures or larger.
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(150 - 600m)
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or 535,000 km