The 310 - 700 metre wide asteroid 2003 AK18 will make a close pass (22.2 lunar distances, 0.0570 AU), travelling at 11.67 km/second, to the Earth-Moon system on the 28th December, 2011 @ 17:29 UT ±00:01.
Asteroid 2003 AK18 Minimum distance: 0.05703 AU Date: 28th December 2011 @ 17:29 UT Maximum magnitude: 15.8 V Date of maximum magnitude: 30th December, 2011 @ 15:00 UT Maximum angular velocity: 17.38 "/min Date of maximum angular velocity: 28th December 2011 @ 09:00 UT Absolute magnitude: 19.7 (~389m)
Orbital elements: 2003 AK18 Epoch 2003 Jan. 1.0 TT = JDT 2452640.5 MPC M 103.39325 (2000.0) P Q n 1.19842018 Peri. 23.80070 +0.82372031 +0.55648444 a 0.8778022 Node 301.94426 -0.53860148 +0.70806845 e 0.3840114 Incl. 7.35794 -0.17718152 +0.43470005 P 0.82 H 19.8 G 0.15 From 24 observations 2003 Jan. 7-8.