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: http://www.naic.edu/~radarusr/1998QE2/qe2.html
Дата изменения: Fri Jun 7 04:47:39 2013 Дата индексирования: Fri Feb 28 00:29:34 2014 Кодировка: Поисковые слова: asteroid |
Arecibo Observatory took radar images of asteroid 1998 QE2 and its moon as the space rock sailed safely past earth. The sequence of images show a dark, cratered asteroid 3.0 kilometers across (1.9 miles) across with a companion moon about 750 meters (2500 feet) in size. Both the asteroid and its moon passed 6 million kilometers (3.8 million miles) from earth. This object is in no danger of hitting the Earth, but comes close enough to study with a variety of telescopes, large and small.
Each vertical pixel corresponds to 7.5 meters (25 feet) in range, while horizontal pixels correspond to 0.075 Hz (Doppler shift due to rotation).
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| Radar images of asteroid 1998 QE2 (bottom) and its satellite (top) on June 6. Each image is a sum of 4, spaced apart by about 20 minutes. |