Update The 190 - 420 metre wide asteroid 2011 HC36 will make a close pass (38.2 lunar distances, 0.0982 AU), travelling at 12.70 km/second, to the Earth-Moon system on the 4th October, 2011 @ 07:34 UT ±00:01.
The 180 - 400 metre wide asteroid 2011 HC3 will make a close pass (38.2 lunar distances, 0.0981 AU), travelling at 12.69 km/second, to the Earth-Moon system on the 4th October, 2011 @ 07:30 UT ±00:34.
Orbital elements:
2011 HC36 Earth MOID = 0.0974 AU
Epoch 2011 Feb. 8.0 TT = JDT 2455600.5 MPC
M 265.68160 (2000.0) P Q
n 0.46917310 Peri. 121.42885 +0.78370866 +0.61294461
a 1.6402649 Node 201.30255 -0.62101327 +0.77012111
e 0.4009259 Incl. 16.05906 -0.01196901 +0.17667026
P 2.10 H 20.7 G 0.15 U 9