Computer simulations of the possible impact region suggest the asteroid burned up somewhere between Central America and Central Africa - a large stretch. The highest probability is given for the Atlantic just off the coast of West-Africa, making any accidental observations even more unlikely. The impact hence should have taken place in the first few hours of January 2, 2014 (the precise time and location are not yet known).
|Monte Carlo Simulation (purple dots) of the possible impact region (source). The corresponding impact times and locations are listed here.|
|2014 AA discovery image. The asteroid appears as a 19,1mag smear of light (circle). Credit: Catalina Sky Survey, NASA|
|Almahata Sitta fragment. On Feb. 28, 2009, Peter Jenniskens, with help from students and staff of the University of Khartoum, found his first 2008TC3 fragment. Nubian Desert, Sudan. Credit: NASA / SETI / P. Jenniskens|
So far, no observations of the 2014 meteor (which must have been very impressive) are known (to me). If 2014 AA indeed burned up over the Atlantic, (weather)satellites may be the only witnesses. In 2008, TC3 was spotted by some distant webcams, two commercial aircraft pilots and a Meteosat weather satellite.
It will be interesting to see if similar images have been obtained for 2014 AA. So far, there is no confirmation 2014 AA indeed collided with Earth. In any case, neither 2014 AA nor 2008 TC3 pose(d) a real threat to Earth and it's inhabitants. They were much too small - smaller even than the object that exploded over Chelyabinsk, Russia, in February last year.
|Infrared and visual light composite image from EUMETSAT satellite real-time data of the 2008 TC3 asteroid impact. Credit: EUMETSAT|