26th / 27th January
The asteroid 2004 BL86, which is 400 and 900 meters, will sweep past the Earth at a distance of 1.2 million kilometers, three times the distance of the moon.
It will be at its brightest around 4am Greenwich Mean Time - visible over Europe, Africa and most of the Americas.
Eastern Asia and Australia will get a chance to see the asteroid several hours earlier but it won't be as bright.
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