Written by DC Agle
NASA’s Jet Propulsion Laboratory
Pasadena, CA – A collage shows nine radar images of near-Earth asteroid 2007 PA8 that were obtained between October 31st and November 13th, 2012, with data collected by NASA’s 230-foot-wide (70-meter) Deep Space Network antenna at Goldstone, CA.
On November 5th at 8:42am PST (11:42am 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 November 5th and 6th, when the asteroid was closest. The resolution was 25 feet (7.5 meters) per pixel on November 2nd, 3rd and 8th, and 62 feet (18.75 meters) per pixel on October 31st and November 11th to 13th.
New radar measurements of 2007 PA8’s distance and line-of-sight velocity refined calculations of its orbit 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 flyby 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.
JPL manages the Near-Earth Object Program Office for NASA’s Science Mission Directorate in Washington, D.C. JPL is a division of the California Institute of Technology in Pasadena.