Asteroid 2007 TU24 will closely approach the Earth to within 1.4 lunar distances (334,000 miles) on Jan. 29, 2008 at about 3:33 a.m. Eastern US time. This object, which is about 800 feet in diameter, will reach an approximate apparent magnitude of 10.3 before quickly becoming fainter as it moves further from Earth. For a brief time the asteroid will be observable in dark skies with amateur telescopes of 3 inch aperture or larger. Given the estimated number of near-Earth asteroids of this size (about 7,000), an object of this size would be expected to impact the Earth about once every 37,000 years.