Nine radar images of asteroid 2007 PA8

Nov 27, 2012 by Dc Agle
Nine new radar images of near-Earth asteroid 2012 PA8 were obtained between Oct. 31 and Nov. 13, 2012, with data collected by NASA's 230-foot-wide (70-meter) Deep Space Network antenna at Goldstone, Calif. Credit: NASA/JPL-Caltech

(Phys.org)—A collage shows nine radar images of near-Earth asteroid 2007 PA8 that were obtained between Oct. 31 and Nov. 13, 2012, with data collected by NASA's 230-foot-wide (70-meter) Deep Space Network antenna at Goldstone, Calif. On Nov. 5 at 8:42 a.m. PST (11:42 a.m. EST/16:42 UTC), the object came about 4 million miles (6.5 million kilometers) from Earth, or 17 times the distance between Earth and the moon.

The images of 2007 PA8 reveal possible craters, boulders, an irregular, asymmetric shape, and very slow rotation. The asteroid measures approximately one mile wide (about 1.6 kilometers).

Each panel shows one image per day, and all of them are oriented so rotation is counterclockwise. Each image is shown at the same scale and covers 1.1 miles (1.7 kilometers) from top to bottom. The resolution of the images varies from day to day as the asteroid's distance changed. The images achieve resolutions as fine as 12 feet (3.75 meters) per pixel on Nov. 5 and 6, when the asteroid was closest. The resolution was 25 feet (7.5 meters) per pixel on Nov. 2, 3 and 8, and 62 feet (18.75 meters) per pixel on Oct. 31 and Nov. 11 to 13.

New of 2007 PA8's distance and line-of-sight velocity refined calculations of its about the sun, enabling reliable computation of the asteroid's motion for the next 632 years. 2007 PA8 is not a threat to Earth. The 2012 flyby was the closest since 1880. The next with Earth closer than the one that occurred this year will be in 2488, when the asteroid will approach no closer than 3.6 million miles (5.8 million kilometers).

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.

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User comments : 2

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Sonhouse
5 / 5 (1) Nov 27, 2012
Not bad for a radio telescope! Or ANY telescope!, resolution about 0.0001 arc second, 100 MICRO arc seconds! A LOT better than hubble and radio frequencies. Wonder what frequency the radar pulse was? My guess, 10 gigahertz.
james_anthoney_716
not rated yet Dec 28, 2012
Wow! Awesome post and pics.
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