Tuesday, November 22, 2011

Phil Plait: How to defend Earth from asteroids




What's six miles wide and can end civilization in an instant? An asteroid - and there are lots of them out there. With humor and great visuals, Phil Plait enthralls the TEDxBoulder audience with all the ways asteroids can kill, and what we must do to avoid them.

UPCOMING CLOSE APPROACHES TO EARTH
1 AU = ~150 million kilometers
1 LD = Lunar Distance = ~384,000 kilometers
Object
Name
Close
Approach
Date
Miss
Distance
(AU)
Miss
Distance
(LD)
Estimated
Diameter*
H
(mag)
Relative
Velocity
(km/s)
175706 (1996 FG3)  2011-Nov-23 0.1014 39.5 670 m - 1.5 km 18.0 8.13
(2011 WP4)  2011-Nov-24 0.0038 1.5 11 m - 25 m 26.9 10.86
(2011 WN2)  2011-Nov-25 0.0210 8.2 24 m - 53 m 25.3 8.71
(2011 SR69)  2011-Nov-26 0.1143 44.5 270 m - 590 m 20.0 6.63
(2011 WR2)  2011-Nov-26 0.0500 19.5 24 m - 53 m 25.3 12.50
(2010 RJ43)  2011-Nov-26 0.1930 75.1 59 m - 130 m 23.3 10.66
(2008 KT)  2011-Nov-27 0.0674 26.2 6.0 m - 14 m 28.2 4.97
(1994 XL1)  2011-Nov-28 0.1182 46.0 180 m - 400 m 20.8 16.36
289315 (2005 AN26)  2011-Nov-29 0.0918 35.7 550 m - 1.2 km 18.4 12.51
(2002 TZ66)  2011-Nov-30 0.1471 57.3 18 m - 39 m 25.9 4.30
(2004 JN1)  2011-Dec-01 0.1473 57.3 54 m - 120 m 23.5 8.96
(2011 WD)  2011-Dec-01 0.0736 28.6 17 m - 37 m 26.0 3.63
(2006 WO3)  2011-Dec-01 0.1564 60.9 140 m - 300 m 21.5 13.38
(2011 KG4)  2011-Dec-03 0.0921 35.9 67 m - 150 m 23.0 12.52
(2003 XV)  2011-Dec-04 0.0262 10.2 12 m - 27 m 26.7 12.66
(2010 TK7)  2011-Dec-05 0.1991 77.5 200 m - 450 m 20.6 14.62
170502 (2003 WM7)  2011-Dec-09 0.1224 47.6 990 m - 2.2 km 17.1 28.54
(2003 SS84)  2011-Dec-09 0.1723 67.0 120 m - 260 m 21.8 10.96
(2011 WU4)  2011-Dec-09 0.0844 32.8 85 m - 190 m 22.5 10.05
190491 (2000 FJ10)  2011-Dec-09 0.1213 47.2 170 m - 390 m 20.9 4.90
(2011 WK5)  2011-Dec-10 0.0818 31.8 52 m - 120 m 23.5 6.24
(2009 VO24)  2011-Dec-12 0.1491 58.0 300 m - 680 m 19.7 14.33
(2011 UV158)  2011-Dec-13 0.0980 38.2 110 m - 240 m 22.0 10.20
(2004 BG41)  2011-Dec-14 0.0335 13.0 35 m - 77 m 24.4 8.36
(2011 GD60)  2011-Dec-15 0.1892 73.7 120 m - 270 m 21.7 4.92
137671 (1999 XP35)  2011-Dec-20 0.1991 77.5 620 m - 1.4 km 18.2 11.15
(2008 YQ27)  2011-Dec-20 0.0991 38.6 81 m - 180 m 22.6 12.74
(2011 OV18)  2011-Dec-20 0.0495 19.3 320 m - 710 m 19.6 12.09
(2008 AF3)  2011-Dec-24 0.0915 35.6 14 m - 31 m 26.4 6.01
(2000 YA)  2011-Dec-26 0.0074 2.9 49 m - 110 m 23.7 13.62
(2001 YE4)  2011-Dec-26 0.0668 26.0 210 m - 460 m 20.5 10.79
(2009 WK1)  2011-Dec-26 0.1126 43.8 9.5 m - 21 m 27.2 7.41
(2011 SL102)  2011-Dec-28 0.1949 75.9 630 m - 1.4 km 18.1 6.02
(2003 AK18)  2011-Dec-28 0.0570 22.2 310 m - 700 m 19.6 11.67
(2004 XK50)  2011-Dec-29 0.1346 52.4 390 m - 870 m 19.2 26.38
(2000 CH59)  2011-Dec-29 0.1158 45.1 320 m - 710 m 19.6 9.59
(2011 ON24)  2011-Dec-30 0.1858 72.3 68 m - 150 m 23.0 9.36
263976 (2009 KD5)  2011-Dec-31 0.1516 59.0 590 m - 1.3 km 18.3 8.83
(2002 AB2)  2012-Jan-01 0.1479 57.5 67 m - 150 m 23.0 10.15
(2007 AM)  2012-Jan-01 0.1906 74.2 130 m - 280 m 21.6 11.36
(2007 BD)  2012-Jan-02 0.0935 36.4 20 m - 45 m 25.6 9.40
(2004 FG29)  2012-Jan-02 0.1932 75.2 19 m - 41 m 25.8 20.55
(2003 AF23)  2012-Jan-04 0.0361 14.1 200 m - 460 m 20.6 16.18
(2008 SA)  2012-Jan-06 0.0563 21.9 26 m - 58 m 25.0 6.63
(1999 LS7)  2012-Jan-06 0.1379 53.7 190 m - 430 m 20.7 11.90
(2011 VO5)  2012-Jan-07 0.1955 76.1 110 m - 260 m 21.8 8.44
(2011 AC3)  2012-Jan-09 0.0765 29.8 89 m - 200 m 22.4 20.61
(2002 BF25)  2012-Jan-11 0.0677 26.3 82 m - 180 m 22.5 8.77
(2004 YD)  2012-Jan-12 0.1284 50.0 41 m - 92 m 24.1 8.45
(2005 BU)  2012-Jan-14 0.0517 20.1 13 m - 29 m 26.6 11.24
(2010 JK1)  2012-Jan-21 0.1644 64.0 35 m - 78 m 24.4 4.27
(2005 YO3)  2012-Jan-21 0.1265 49.2 25 m - 57 m 25.1 9.44
P/2006 T1 (Levy)  2012-Jan-21 0.1911 74.4 n/a 0.0 15.46
(2009 BO58)  2012-Jan-24 0.1795 69.8 110 m - 250 m 21.9 20.32
(2010 LN14)  2012-Jan-24 0.1500 58.4 160 m - 350 m 21.1 19.19
7341 (1991 VK)  2012-Jan-25 0.0650 25.3 1.2 km - 2.7 km 16.7 8.73
(2011 FC29)  2012-Jan-26 0.1720 67.0 170 m - 380 m 20.9 17.47
(2008 CL20)  2012-Jan-28 0.1168 45.4 23 m - 52 m 25.3 9.96
(2010 WU8)  2012-Jan-30 0.0776 30.2 39 m - 86 m 24.2 7.91
433 Eros  2012-Jan-31 0.1787 69.5 17 km 11.2 5.95
(2008 EP6)  2012-Feb-01 0.0605 23.6 360 m - 790 m 19.4 12.72
278381 (2007 MR)  2012-Feb-01 0.0727 28.3 110 m - 250 m 21.9 8.58
(2006 SU217)  2012-Feb-01 0.0716 27.9 22 m - 49 m 25.4 7.36
(2006 CJ)  2012-Feb-01 0.0453 17.6 250 m - 560 m 20.1 21.89
(2006 AL8)  2012-Feb-01 0.1050 40.9 580 m - 1.3 km 18.3 36.73
(2011 CE50)  2012-Feb-10 0.1898 73.9 60 m - 130 m 23.2 8.85
(2009 DT10)  2012-Feb-11 0.0268 10.4 70 m - 160 m 22.9 14.16
(2008 CQ116)  2012-Feb-13 0.1446 56.3 50 m - 110 m 23.6 14.62
(2010 GR33)  2012-Feb-13 0.1119 43.6 75 m - 170 m 22.8 8.95
(2004 XG)  2012-Feb-14 0.1968 76.6 40 m - 89 m 24.1 14.23
(2008 QY)  2012-Feb-14 0.1531 59.6 540 m - 1.2 km 18.5 22.29
(2009 AV)  2012-Feb-16 0.1154 44.9 710 m - 1.6 km 17.9 24.01
(1993 DA)  2012-Feb-17 0.0410 16.0 14 m - 31 m 26.4 6.62
(2002 TZ66)  2012-Feb-18 0.1247 48.5 18 m - 39 m 25.9 5.59
162421 (2000 ET70)  2012-Feb-19 0.0454 17.7 630 m - 1.4 km 18.1 11.54
(2008 WZ13)  2012-Feb-21 0.1471 57.2 520 m - 1.2 km 18.5 10.49
(2011 CP4)  2012-Feb-23 0.0233 9.1 160 m - 350 m 21.2 30.47
(2007 RS1)  2012-Feb-24 0.1558 60.6 1.7 m - 3.8 m 31.0 16.01
(2008 BX2)  2012-Feb-25 0.1560 60.7 50 m - 110 m 23.6 7.66
(2010 RF12)  2012-Feb-26 0.0958 37.3 5.6 m - 13 m 28.4 8.00

* Diameter estimates based on the object's absolute magnitude.

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