CSS NEWS



	
	Impact of Asteroid 2008 TC3 Confirmed
	Don Yeomans
	NASA/JPL Near-Earth Object Program Office
	October 7, 2008

	Confirmation has been received that the asteroid impact fireball
	occurred at the predicted time and place. The energy recorded
	was estimated to be 0.9 to 1.0 kT of TNT and the time of
	detection was 02:45:45 on October 7 (Greenwich Standard Time).
	More details on this detection will be forthcoming. An
	additional confirmation was apparently reported by a KLM
	airliner (see: http://www.spaceweather.com/). As reported by
	Peter Brown (University of Western Ontario, Canada), a
	preliminary examination of infrasound stations nearest to the
	predicted impact point shows that at least one station recorded
	the event. These measurements are consistent with the predicted
	time and place of the atmospheric impact and indicate an
	estimated energy of 1.1 - 2.1 kT of TNT.

	The follow-up astrometric observations from professional and
	sophisticated amateur astronomers alike were rather
	extraordinary, with 570 observations from 26 observatories being
	reported between the time of discovery by the Catalina Sky
	Survey to just before the object entered Earth's shadow (57
	minutes prior to impact). All this happened in less than 19
	hours!