14-February-2008, 04:38 PM
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Order of Kilopi
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Join Date: Mar 2004
Posts: 13,451
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Cornell University: Arecibo Observatory astronomers discover first near-Earth triple asteroid just 7 million miles away
They repeat the image (courtesy Arecibo Observatory):
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The main, central body is spherical with a diameter of roughly 1.5 miles (2 kilometers), while the larger of the two moons is about half that size. The smallest object is about 1,000 feet across, or about the size of the Arecibo telescope.
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Ah, there's a NAIC images page.
Another radar view:
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Originally Posted by hhEb09'1
Just what are we looking at [...]? Is that large object with the round edge one of them, but all three are supposedly about the same size?
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The "narrower" smaller objects are explained.
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These radar images of near-Earth asteroid 2001 SN263 were obtained on 2008 Feb 12 and 13. The resolution is 75m (250 feet) per pixel. Because the moons are rotating more slowly than the larger "primary", they appear narrower to the radar, which measures distance and speed. Arecibo transmitted 500 000 Watts toward the asteroid, but the echo power received with Arecibo's ultra-sensitive detectors and processed into these images totals less than a billionth of a billionth of a billionth of a watt. Arecibo is both the world's most powerful radar transmitter and the world's most sensitive radio receiver.
This experiment produced 75-meter-resolution images of a 2-km asteroid when it was about 11,000,000 km away. This is like using a camera in New York to image a person in Los Angeles with one-inch resolution.
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