[12][13][14] Although the early original criticism had not undergone peer review,[15] a more recent peer-reviewed study was subsequently published. At 5.4 kilometers in diameter, the largest known potentially hazardous asteroid is Toutatis. [4], Most of these objects are potentially hazardous asteroids (PHAs), and a few are comets. "There is no danger of a collision with Earth," NASA researcher, Lance Benner, said in a statement on Wednesday. Both professional and amateur astronomers participate in such observation and tracking. [4] Most potentially hazardous asteroids are ruled out as hazardous to at least several hundreds of years when their competing best orbit models become sufficiently divergent, but recent discoveries whose orbital constraints are little-known have divergent or incomplete mechanical models until observation yields further data. Each one found is studied by various means, including optical, radar, and infrared to determine its characteristics, such as size, composition, rotation state, and to more accurately determine its orbit. Market data provided by Factset. The closest Toutatis ever passed near Earth was in 2004 when it flew by less than a million miles away, in spite of still not posing a threat. Linda described Toutatis as a large asteroid, measuring 4.6 km long by 2.4 km wide, in a chaotic orbit that crosses Earth's own orbit. Radar imagery of asteroid Toutatis taken by NASA's Goldstone Solar System Radar on Dec. 12 and 13, 2012 (NASA/JPL-Caltech). (Beyond that time, the asteroid's orbit cannot be accurately computed.). Quotes displayed in real-time or delayed by at least 15 minutes. [2] 98% of the known potentially hazardous objects are not an impact threat over the next 100 years. from radar observations. [1][2] This is big enough to cause regional devastation to human settlements unprecedented in human history in the case of a land impact, or a major tsunami in the case of an ocean impact. [5] The Minor Planet Center's website List of the Potentially Hazardous Asteroids also publishes detailed information for these objects. This time it’s the asteroid 4179 Toutatis, which, according to no less an authority than the celebrated Swiss UFO contactee Billy Meier, is in danger of slamming into Earth on September 29, 2004 (see Billy Meier’s Warning of a Catastrophic Impact Event Threat). By comparison, asteroids that populate the main asteroid belt between Mars and Jupiter, and pose no threat to Earth, can be as big as 940 kilometers (about 583 miles) across. This material may not be published, broadcast, rewritten, NASA's, List of asteroid close approaches to Earth, "Report of the Task Force on potentially hazardous Near Earth Objects", "NEO Basics – Potentially Hazardous Asteroids (PHAs)", "Discovery Statistics – Cumulative Totals", "JPL Small-Body Database Search Engine: PHAs and orbital class (APO)", "JPL Small-Body Database Search Engine: PHAs and orbital class (ATE)", "List of the Potentially Hazardous Asteroids (PHAs)", "NASA news – NASA Survey Counts Potentially Hazardous Asteroids", "Asteroid Hunter Gives an Update on the Threat of Near-Earth Objects", "How Big Are Those Killer Asteroids?

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