Asteroid Toutatis slowly tumbles by earth

December 17th, 2012 in Astronomy & Space / Space Exploration
Radar imagery of asteroid Toutatis taken by NASA's Goldstone Solar System Radar on Dec. 12 and 13, 2012. Image credit: NASA/JPL-Caltech


Radar imagery of asteroid Toutatis taken by NASA's Goldstone Solar System Radar on Dec. 12 and 13, 2012. Image credit: NASA/JPL-Caltech

(Phys.org)—Scientists working with NASA's 230-foot-wide (70-meter) Deep Space Network antenna at Goldstone, Calif., have generated a series of radar data images of a three-mile-long (4.8-kilometer) asteroid that made its closest approach to Earth on Dec. 12, 2012.

The radar data images of have been assembled into a short movie, available online at: http://www.jpl.nasa.gov/video/index.php?id=1175 .

The images that make up the movie clip were generated with data taken on Dec. 12 and 13, 2012. On Dec. 12, the day of its closest approach to Earth, Toutatis was about 18 lunar distances, 4.3 million miles (6.9 million kilometers) from Earth. On Dec. 13, the was about 4.4 million miles (7 million kilometers), or about 18.2 lunar distances.

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This 64-frame movie of asteroid Toutatis was generated from data by Goldstone's Solar System Radar on Dec. 12 and 13, 2012.

The radar data images of asteroid Toutatis indicate that it is an elongated, irregularly shaped object with ridges and perhaps craters. Along with shape detail, scientists are also seeing some interesting bright glints that could be surface boulders. Toutatis has a very slow, tumbling rotational state. The asteroid rotates about its long axis every 5.4 days and precesses (changes the orientation of its ) like a wobbling, badly thrown football, every 7.4 days.

The orbit of Toutatis is well understood. The next time Toutatis will approach at least this close to Earth is in November of 2069, when the asteroid will safely fly by at about 7.7 lunar distances, or 1.8 million miles (3 million kilometers). An analysis indicates there is zero possibility of an Earth impact over the entire interval over which its motion can be accurately computed, which is about the next four centuries.

This imagery will help scientists improve their understanding of the asteroid's , which will also help them understand its interior.

The resolution in the image frames is 12 feet (3.75 meters) per pixel.

NASA detects, tracks and characterizes asteroids and comets passing close to Earth using both ground- and space-based telescopes. The Near-Earth Object Observations Program, commonly called "Spaceguard," discovers these objects, characterizes a subset of them, and plots their orbits to determine if any could be potentially hazardous to our planet.

Provided by NASA

"Asteroid Toutatis slowly tumbles by earth." December 17th, 2012. http://phys.org/news/2012-12-asteroid-toutatis-slowly-earth.html