Last week the 1998 QE2 passed us by in close proximity at around 5.8 million km up. QE2, which has its own moon is actually larger than originally thought at 3-3.5 rather the originally assumed 2.7km across.
Astronomers have, of course jumped on the oportunity to image the asteroid and, if possible, measure the mass of the asteroid, which will lead to its density and thus give clues to what it is made from.
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