* Astronomy

Orbital elements:
2012 SW2                                                 Earth MOID = 0.0047 AU
Epoch 2012 Sept. 30.0 TT = JDT 2456200.5                MPC
M 351.66825              (2000.0)            P               Q
n   0.26841755     Peri.  240.00784     +0.47603183     -0.87942668
a   2.3801013      Node   181.56809     +0.82513901     +0.44725510
e   0.6756662      Incl.    3.25130     +0.30420274     +0.16300794
P   3.67           H   27.5           G   0.15           U   6

MPEC 2012 - S25

The 9 - 19 metre wide asteroid 2012 SW2 will make a close pass (1.8 lunar distances, 0.0047 AU), travelling at 16.18 km/second, to the Earth-Moon system on the 19th September, 2012 @ 14:19 UT ±00:01. 

See more

The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).