The 25 - 55 metre wide asteroid 2009 SK will make a close pass (19.5 Lunar Distances, 0.0501 AU), travelling at 7.15 km/s, to the Earth-Moon system on the 20th September, 2009. See more
The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).
Orbital elements: 2009 SK Earth MOID = 0.0474 AU Epoch 2009 June 18.0 TT = JDT 2455000.5 MPC M 336.67277 (2000.0) P Q n 0.23279500 Peri. 23.27791 +0.99657167 -0.08262224 a 2.6170998 Node 341.45987 +0.07362383 +0.90933539 e 0.5986399 Incl. 0.77444 +0.03774172 +0.40777776 P 4.23 H 25.1 G 0.15 U 8