radioweather writes "A recently discovered
Apollo Asteroid, 2008 TC3,
exploded over Sudan at about 1046 EDT on October 7, 2008, according to
astronomer Tim Spahr of Harvard University
2008 TC3 was discovered on Monday by an observer at the Mt Lemmon Observatory near Tucson, Arizona. 2008 TC3 is notable in that it is the first Asteroid of its size that was identified before impact and tracking it put the entire Spaceguard tracking system to an extreme test.
TC3 is estimated to be only two to five meters in diameter but exploded with the force of a one kiloton of explosive power."