A mountain-sized asteroid will make its closest approach to Earth at 6:35 a.m. Pacific Time (9:35 a.m. Eastern Time) today.
Although asteroid 4179 Toutatis will come no closer than four times the distance between Earth and the Moon (approximately 1.5 million kilometers or 961,000 miles), this will be the closest approach of any known asteroid of comparable size this century.
"This is the closest Toutatis will come for another 500 years, and its orbit is very well known," said Dr. Don Yeomans of NASA's Jet Propulsion Laboratory, Pasadena, Calif., manager of NASA's Near Earth Objects Program Office. "What this fly-by provides is an opportunity to study one of our closest solar system neighbors."
To view a computer model of asteroid Toutatis on the Internet, visit http://reason.jpl.nasa.gov/~ostro/ToutatisHires.mov