The 460 - 1000 metre wide asteroid 2006 SX217 will make a close pass (12.3 lunar distances, 0.0316 AU), travelling at 12.68 km/second, to the Earth-Moon system on the 23rd April, 2014 @ 17:21 UT ±00:01.
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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 04 20 02 24 04.2 +53 04 23 0.04178 0.9740 42.3 136.1 18.2 2014 04 21 02 31 56.5 +44 42 08 0.03738 0.9740 34.0 144.8 19.1 2014 04 22 02 38 57.2 +34 20 24 0.03401 0.9741 24.2 155.0 20.9 2014 04 23 02 45 12.8 +22 10 11 0.03201 0.9744 14.3 165.2 24.5 2014 04 24 02 50 49.0 +09 02 38 0.03163 0.9747 11.8 167.9 26.3 2014 04 25 02 55 50.7 -03 42 31 0.03293 0.9751 20.4 158.9 21.9 2014 04 26 03 00 22.2 -14 57 43 0.03573 0.9756 30.7 148.3 19.6 2014 04 27 03 04 27.0 -24 15 10 0.03970 0.9762 39.7 138.8 18.4 2014 04 28 03 08 08.3 -31 40 04 0.04453 0.9769 47.1 131.0 17.8 2014 04 29 03 11 28.8 -37 31 35 0.04997 0.9777 53.0 124.6 17.5 2014 04 30 03 14 30.9 -42 10 19 0.05583 0.9786 57.8 119.4 17.3 2014 05 01 03 17 16.6 -45 53 35 0.06198 0.9796 61.7 115.1 17.2 2014 05 02 03 19 47.6 -48 54 41 0.06834 0.9807 64.9 111.5 17.2 2014 05 03 03 22 05.5 -51 23 31 0.07485 0.9818 67.6 108.4 17.2 2014 05 04 03 24 11.9 -53 27 21 0.08146 0.9831 69.8 105.7 17.2 2014 05 05 03 26 07.8 -55 11 36 0.08815 0.9845 71.8 103.3 17.3 2014 05 06 03 27 54.3 -56 40 18 0.09488 0.9859 73.5 101.2 17.3 2014 05 07 03 29 32.5 -57 56 29 0.1017 0.9875 75.0 99.3 17.4 2014 05 08 03 31 03.3 -59 02 30 0.1084 0.9891 76.3 97.6 17.5 2014 05 09 03 32 27.3 -60 00 09 0.1152 0.9908 77.5 96.0 17.5 2014 05 10 03 33 45.4 -60 50 53 0.1220 0.9926 78.5 94.6 17.6 2014 05 11 03 34 58.1 -61 35 48 0.1288 0.9945 79.5 93.2 17.7 2014 05 12 03 36 06.0 -62 15 51 0.1356 0.9964 80.4 91.9 17.7 2014 05 13 03 37 09.6 -62 51 44 0.1423 0.9985 81.2 90.7 17.8 2014 05 14 03 38 09.5 -63 24 06 0.1490 1.0006 82.0 89.6 17.8 2014 05 15 03 39 06.0 -63 53 25 0.1557 1.0028 82.7 88.5 17.9 2014 05 16 03 39 59.5 -64 20 07 0.1624 1.0051 83.3 87.4 17.9 2014 05 17 03 40 50.4 -64 44 34 0.1690 1.0075 84.0 86.4 18.0 2014 05 18 03 41 39.0 -65 07 05 0.1756 1.0100 84.6 85.5 18.0 2014 05 19 03 42 25.6 -65 27 54 0.1821 1.0125 85.1 84.6 18.1 2014 05 20 03 43 10.3 -65 47 16 0.1886 1.0151 85.7 83.7 18.1 2014 05 21 03 43 53.4 -66 05 23 0.1951 1.0178 86.2 82.8 18.2 2014 05 22 03 44 34.9 -66 22 24 0.2015 1.0205 86.7 82.0 18.2 2014 05 23 03 45 15.0 -66 38 30 0.2078 1.0234 87.2 81.1 18.3 2014 05 24 03 45 53.8 -66 53 47 0.2141 1.0262 87.6 80.3 18.3 2014 05 25 03 46 31.1 -67 08 23 0.2203 1.0292 88.1 79.6 18.4 2014 05 26 03 47 07.2 -67 22 24 0.2265 1.0322 88.5 78.8 18.4 2014 05 27 03 47 41.9 -67 35 56 0.2326 1.0353 88.9 78.1 18.4 2014 05 28 03 48 15.1 -67 49 02 0.2387 1.0385 89.4 77.3 18.5 2014 05 29 03 48 47.0 -68 01 48 0.2447 1.0417 89.8 76.6 18.5 2014 05 30 03 49 17.4 -68 14 17 0.2506 1.0450 90.2 75.9 18.5
