The 270 - 590 metre wide asteroid 2013 WF108 will make a close pass (11.3 lunar distances, 0.0290 AU), travelling at 18.42 km/second, to the Earth-Moon system on the 23rd May 2014 @ 16:00 UT ±00:04.
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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).
Ephemeris
Date TT R. A. (2000) Decl. Delta r Elong. Phase Mag 2014 05 22 06 26 25.4 +28 53 44 0.03398 0.9848 35.5 143.3 19.9 2014 05 23 07 01 12.0 +45 13 39 0.02983 0.9915 44.9 133.9 18.5 2014 05 24 08 19 30.2 +62 41 28 0.02918 0.9983 60.0 118.5 17.1 2014 05 25 11 20 12.1 +72 05 55 0.03224 1.0053 75.7 102.5 16.3 2014 05 26 14 09 57.3 +68 20 44 0.03811 1.0123 88.0 89.9 16.1 2014 05 27 15 21 12.4 +61 26 17 0.04572 1.0195 96.7 80.8 16.2 2014 05 28 15 53 30.5 +55 40 54 0.05433 1.0267 102.8 74.3 16.3 2014 05 29 16 11 14.3 +51 16 53 0.06354 1.0340 107.1 69.5 16.5 2014 05 30 16 22 19.0 +47 54 29 0.07312 1.0414 110.4 65.8 16.7 2014 05 31 16 29 51.8 +45 16 06 0.08293 1.0489 112.9 62.9 16.9 2014 06 01 16 35 19.3 +43 09 17 0.09291 1.0564 114.9 60.6 17.1 2014 06 02 16 39 26.9 +41 25 29 0.1030 1.0640 116.5 58.6 17.3 2014 06 03 16 42 40.6 +39 58 48 0.1132 1.0717 117.8 56.9 17.5 2014 06 04 16 45 16.1 +38 45 07 0.1234 1.0794 118.9 55.4 17.6 2014 06 05 16 47 23.9 +37 41 28 0.1337 1.0872 119.8 54.1 17.8 2014 06 06 16 49 10.7 +36 45 43 0.1441 1.0951 120.6 52.9 17.9 2014 06 07 16 50 41.4 +35 56 14 0.1544 1.1030 121.3 51.8 18.1 2014 06 08 16 51 59.5 +35 11 48 0.1648 1.1110 121.9 50.8 18.2 2014 06 09 16 53 07.5 +34 31 29 0.1753 1.1190 122.5 49.9 18.3 2014 06 10 16 54 07.5 +33 54 33 0.1857 1.1271 123.0 49.1 18.4
