The asteroid Toutatis flew by Earth on September 29. Based on highly accurate radar data, Dr. Steve Ostro (JPL) had predicted several years earlier that its closest planetary approach +/- (3 Sigma) would be 1,549,834 +/- 9.6 km for this encounter.
The question is how close did it really come. Was the fly-by within the 3 sigma error window? If not, how much was it off?