2012 XE54 was discovered yesterday on December 9th.
It is a small 36 meter Apollo class near earth object.
It makes it's close approach between Earth and Moon...

Earth --- 2012-Dec-11 --- 10:08 UTC --- 0.0015 AU / .06 LD
Moon --- 2012-Dec-11 --- 16:52 UTC --- 0.0021 AU

It will pass through the Earth's shadow, a very rare event.

According to JPL Horizons data, previous close approaches were:

1982-Nov-11 --- 0.4910 AU
1991-Apr-14 --- 0.2563 AU
2002-Feb-22 --- 0.1752 AU
2012-Dec-11 --- 0.0015 AU (next)
[link to ssd.jpl.nasa.gov]

:roids: