Bellow its NEO JPL table where it figures Asteroid 2004 RQ252 and data on its fly-by on April 13Th, 2013, and where it can be confirmed that it wont hit our planet.
The Asteroid 2004 RQ252 has a size between 90m to 210 meters.
Miss Distance (LD,AU) : The most likely (Nominal) and minimum possible (Minimum) miss distances are given in LD (Lunar Distance) and AU ( Astronomical Distance)
(LD) Lunar Distance: 1.0 LD is about 3.84x10^5 km or 0.00257 AU (the average distance between the Earth and the Moon).
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