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A relatively small asteroid passed within 120,000 kilometres of Earth on 11 December. That is around a third of the distance between the Moon and Earth. The object, preliminarily designated as 2002 XV90, was detected the day after the close approach.
With an estimated diameter between 25 and 60 metres, 2002 XV90 was far too small to have any direct global consequences. However, such an object would likely have caused a significant atmospheric detonation.
The close approach highlights the difficulties involved in detecting such small NEOs, particularly if they emerge from the direction of the Sun.
More info: Orbital information available at NEODyS
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