now listed under "Objects Not Recently Observed",
but 1:45000 chance of striking Earth
http://neo.jpl.nasa.gov/risk/
Scientist: Asteroid May Hit Earth in 2029
Yahoo/AP | 12/23/04 | JOHN ANTCZAK
Posted on 12/23/2004 11:24:16 PM EST by hole_n_one
http://www.freerepublic.com/focus/news/1307719/posts
Asteroid 1950 DA
http://neo.jpl.nasa.gov/1950da/
Asteroid (29075) 1950 DA was discovered on 23 February 1950. It was observed for 17 days and then faded from view for half a century. Then, an object discovered on 31 December 2000 was recognized as being the long-lost 1950 DA. (As an aside, this was New Century's Eve and exactly 200 years to the night after the discovery of the first asteroid, Ceres.)
Radar observations were made at Goldstone and Arecibo on 3-7 March 2001, during the asteroid's 7.8 million km approach to the Earth (a distance 21 times larger than that separating the Earth and Moon). Radar echoes revealed a slightly asymmetrical spheroid with a mean diameter of 1.1 km. Optical observations showed the asteroid rotated once every 2.1 hours, the second fastest spin rate ever observed for an asteroid its size.
Detection of A Potential Hazard
When high-precision radar meaurements were included in a new orbit solution, a potentially very close approach to the Earth on March 16, 2880 was discovered to exist.
Object Designation Year Range Potential Impacts Impact Prob. (cum.) Vinfinity (km/s) H (mag) Est. Diam. (km) Palermo Scale (cum.) Palermo Scale (max.) Torino Scale (max.) 2005 WN3 2024-2024 1 3.0e-08 18.17 29.9 0.004 -9.23 -9.23 0 2006 BF56 2092-2106 7 6.3e-06 26.19 29.6 0.004 -7.30 -7.69 0 2006 BO7 2060-2060 1 2.0e-07 9.83 29.3 0.005 -8.86 -8.86 0 2004 FU162 2007-2104 822 6.2e-05 9.93 28.9 0.006 -5.41 -6.37 0 2006 DO62 2036-2095 11 1.6e-06 11.19 28.3 0.007 -7.45 -7.87 0 2006 JY26 2073-2106 69 5.4e-03 2.98 28.4 0.007 -4.25 -4.32 0 2006 WP1 2015-2017 2 2.0e-05 18.00 28.2 0.008 -5.34 -5.38 0 2006 UJ185 2052-2105 7 2.0e-06 15.44 27.9 0.009 -7.15 -7.75 0 2006 SR131 2071-2106 19 2.2e-05 8.47 28.0 0.009 -6.37 -6.99 0 2007 BB 2076-2076 1 2.6e-06 4.45 27.8 0.009 -7.29 -7.29 0 2006 GU2 2022-2104 66 9.7e-06 7.32 27.8 0.009 -6.49 -6.88 0 2001 GP2 2043-2099 32 1.0e-04 2.58 26.9 0.010 -5.26 -5.71 0 2003 WT153 2044-2103 39 1.2e-05 4.33 28.1 0.010 -6.75 -7.41 0 2003 UM3 2022-2099 38 1.2e-06 14.38 28.1 0.010 -7.38 -7.97 0 2005 TK50 2027-2100 3 1.3e-08 21.47 28.6 0.010 -9.50 -9.76 0 2005 TA 2099-2102 3 1.8e-06 4.82 27.2 0.010 -7.30 -7.33 0 2005 UC3 2076-2101 2 4.8e-07 7.65 27.1 0.010 -7.71 -7.95 0 2000 SZ162 2070-2096 3 5.3e-07 4.18 27.1 0.010 -7.67 -8.01 0 2005 TH50 2031-2094 24 5.7e-05 4.93 28.0 0.010 -5.96 -6.36 0 2005 VN5 2047-2102 17 7.4e-05 6.57 27.0 0.010 -5.35 -5.72 0 2004 PU42 2071-2103 18 7.7e-05 10.11 26.8 0.010 -5.23 -5.85 0 2005 BS1 2016-2041 5 8.2e-05 12.36 27.3 0.010 -4.51 -4.51 0 2000 LG6 2075-2101 20 8.6e-04 2.10 29.0 0.010 -5.49 -5.91 0 1991 BA 2014-2096 11 8.7e-07 18.03 28.7 0.010 -7.48 -7.97 0 2003 YS70 2075-2103 2 8.9e-07 3.14 28.8 0.010 -8.30 -8.37 0 1994 GV 2048-2086 23 9.2e-05 8.15 27.5 0.010 -5.40 -5.99 0 2007 DC 2025-2064 105 1.7e-06 6.88 27.5 0.011 -7.01 -7.78 0 2006 YE 2082-2095 4 2.4e-06 6.01 27.3 0.012 -7.13 -7.38 0 2006 UQ216 2064-2106 5 2.5e-07 3.76 27.3 0.012 -8.06 -8.32 0 2006 XZ2 2074-2097 4 4.1e-07 9.08 27.1 0.013 -7.67 -8.00 0 2006 DM63 2031-2093 37 1.2e-04 10.37 26.7 0.015 -4.55 -4.92 0 2005 VL1 2031-2104 50 1.4e-05 6.40 26.7 0.015 -5.92 -6.50 0 2007 CC27 2056-2104 54 9.3e-05 10.81 26.8 0.015 -5.11 -5.87 0 2006 HE2 2069-2103 5 2.2e-06 5.02 26.5 0.017 -6.78 -6.98 0 2006 WV29 2036-2105 11 4.7e-06 16.75 26.5 0.017 -6.07 -6.50 0 2006 UU17 2075-2104 5 1.9e-05 9.80 26.4 0.018 -5.75 -5.99 0 2002 UV36 2087-2087 1 1.5e-05 8.06 26.5 0.020 -5.90 -5.90 0 2004 BN41 2086-2098 2 1.5e-06 7.56 25.8 0.020 -6.57 -6.69 0 2004 XB45 2035-2035 1 1.6e-08 17.02 26.3 0.020 -8.03 -8.03 0 2006 SF281 2009-2105 328 2.3e-06 4.51 26.2 0.020 -5.59 -6.93 0 2004 VM24 2074-2098 18 2.9e-05 12.86 25.7 0.020 -5.03 -5.48 0 2002 TA58 2081-2081 1 3.0e-09 11.30 26.6 0.020 -9.50 -9.50 0 2003 DW10 2046-2054 3 4.1e-07 7.82 26.1 0.020 -6.98 -7.10 0 2004 XO63 2065-2065 1 4.5e-09 8.16 26.1 0.020 -9.06 -9.06 0 2001 BA16 2033-2051 4 5.3e-06 4.90 25.8 0.020 -5.77 -5.80 0 1998 BT13 2036-2036 1 6.0e-08 8.03 26.4 0.020 -7.79 -7.79 0 2004 RU109 2038-2053 5 6.1e-07 12.93 26.5 0.020 -6.81 -7.21 0 2005 UA1 2036-2036 1 7.8e-08 14.68 26.4 0.020 -7.46 -7.46 0 2005 AU3 2048-2105 15 9.1e-06 14.46 26.0 0.020 -5.70 -6.06 0 2006 WZ184 2044-2104 19 4.4e-06 7.27 26.0 0.021 -6.27 -7.02 0 2006 TF 2029-2029 1 6.8e-10 8.07 25.8 0.023 -9.33 -9.33 0 2007 DD 2042-2107 95 4.6e-06 3.39 25.5 0.027 -5.94 -6.68 0 2006 BM8 2106-2106 3 7.9e-07 14.82 25.4 0.028 -6.50 -6.83 0 1997 UA11 2073-2073 1 1.5e-07 11.96 25.2 0.030 -7.06 -7.06 0 2004 VZ14 2076-2104 6 2.0e-06 15.20 25.3 0.030 -5.97 -6.45 0 2006 QV89 2019-2046 17 3.2e-04 5.17 25.3 0.030 -3.22 -3.23 0 2001 YN2 2020-2020 1 3.2e-09 18.49 24.9 0.030 -7.85 -7.85 0 1995 CS 2042-2073 6 3.7e-06 24.91 25.5 0.030 -5.34 -5.70 0 2002 TY59 2074-2084 2 4.8e-07 8.22 25.4 0.030 -6.84 -6.84 0 2005 QK76 2030-2083 9 5.3e-05 19.67 25.2 0.030 -3.89 -4.08 0 1998 DK36 2025-2100 24 7.1e-07 6.19 25.0 0.030 -6.42 -6.54 0 2005 XA8 2063-2086 28 7.9e-05 12.08 25.6 0.030 -4.55 -4.71 0 2002 XV90 2101-2101 3 8.2e-07 7.63 25.2 0.030 -6.61 -6.69 0 2005 VP 2045-2103 27 8.8e-08 12.71 25.4 0.030 -7.29 -7.89 0 2006 HX57 2045-2065 2 1.7e-06 10.54 25.2 0.031 -5.95 -6.02 0 2006 SC 2043-2095 5 3.1e-05 12.23 25.2 0.031 -4.58 -4.60 0 2006 BC8 2081-2103 11 3.9e-06 13.19 25.1 0.032 -5.65 -6.13 0 2006 UC64 2069-2078 2 1.6e-08 20.14 25.0 0.034 -7.65 -7.76 0 2006 WZ29 2060-2060 1 3.2e-09 11.55 24.7 0.039 -8.39 -8.39 0 2003 LN6 2061-2099 3 1.6e-06 3.96 24.5 0.040 -5.85 -5.88 0 2004 XK3 2029-2104 66 1.7e-04 6.55 24.5 0.040 -3.81 -4.06 0 2001 AV43 2066-2097 6 1.7e-05 3.71 24.4 0.040 -4.82 -5.03 0 2000 SG344 2068-2101 68 1.8e-03 1.37 24.8 0.040 -3.08 -3.43 0 2002 VU17 2084-2099 5 1.9e-05 13.69 24.8 0.040 -4.80 -5.22 0 2005 UL6 2068-2068 2 2.1e-07 12.02 24.5 0.040 -6.53 -6.69 0 1997 TC25 2090-2096 2 2.9e-07 9.92 24.9 0.040 -6.80 -6.81 0 2002 CB19 2049-2049 1 5.7e-08 15.73 24.8 0.040 -6.99 -6.99 0 2006 DN 2056-2056 1 3.0e-07 3.99 24.5 0.043 -6.50 -6.50 0 2006 HF6 2068-2070 7 6.8e-06 16.39 24.5 0.043 -4.88 -5.35 0 2007 CS5 2009-2031 12 1.0e-06 4.98 24.3 0.046 -5.46 -5.85 0 2006 WC30 2073-2073 1 1.6e-08 9.12 24.3 0.047 -7.65 -7.65 0 2007 DJ 2018-2102 5 3.0e-08 13.84 24.2 0.049 -6.58 -6.66 0 1999 SF10 2080-2100 3 1.0e-06 4.76 24.0 0.050 -5.98 -6.23 0 2000 SB45 2074-2101 83 1.5e-04 7.54 24.3 0.050 -3.86 -4.28 0 2005 EL70 2034-2058 2 1.8e-06 35.50 24.1 0.050 -4.48 -4.49 0 2003 UQ25 2093-2093 1 5.2e-08 18.01 24.2 0.050 -6.96 -6.96 0 2001 UO 2020-2020 1 5.4e-09 16.28 24.1 0.050 -7.28 -7.28 0 1994 GK 2051-2071 7 6.1e-05 14.87 24.2 0.050 -3.83 -3.84 0 2005 TM173 2009-2104 167 9.4e-07 8.82 24.1 0.052 -5.51 -6.40 0 2005 ED224 2018-2064 6 2.8e-06 25.17 24.0 0.054 -4.27 -4.48 0 2006 JE 2094-2106 2 1.5e-06 26.37 23.8 0.058 -5.18 -5.19 0 2002 TX55 2089-2096 3 1.8e-05 10.15 23.6 0.060 -4.38 -4.42 0 2006 QN111 2079-2079 1 2.1e-06 10.55 23.8 0.060 -5.29 -5.29 0 1999 RZ31 2056-2056 1 4.5e-07 8.20 23.8 0.060 -5.92 -5.92 0 2005 GQ33 2051-2103 8 7.2e-09 20.78 23.7 0.060 -7.41 -7.90 0 1996 TC1 2054-2075 4 9.4e-07 24.04 23.9 0.060 -5.28 -5.52 0 2005 WG57 2029-2104 8 2.3e-06 9.91 23.6 0.063 -4.84 -4.90 0 2005 YR3 2058-2058 2 1.8e-07 6.43 23.6 0.065 -6.25 -6.51 0 2002 MN 2070-2101 8 3.3e-06 10.40 23.3 0.070 -4.91 -5.30 0 2007 CT26 2099-2104 7 1.6e-06 10.61 23.3 0.074 -5.30 -5.53 0 2006 FW33 2012-2103 59 7.2e-08 9.26 23.2 0.079 -6.04 -6.59 0 2002 RB182 2044-2086 13 1.5e-06 13.20 22.8 0.090 -4.89 -5.23 0 2004 XM29 2045-2045 1 4.0e-10 15.11 22.9 0.090 -8.19 -8.19 0 2001 BB16 2084-2100 4 5.4e-06 3.57 22.6 0.100 -4.57 -4.70 0 2004 ME6 2017-2099 43 1.1e-07 12.05 22.6 0.102 -5.64 -6.35 0 1994 WR12 2054-2102 134 1.0e-04 9.84 22.4 0.110 -2.96 -3.75 0 2001 SB170 2089-2095 2 6.5e-08 22.49 22.5 0.110 -5.92 -6.18 0 2004 HZ 2023-2023 1 9.1e-08 13.26 22.3 0.120 -5.27 -5.27 0 2005 UO 2074-2074 2 1.4e-07 19.02 22.1 0.130 -5.37 -5.38 0 2005 YU55 2036-2105 59 4.5e-06 13.58 22.0 0.130 -3.87 -4.92 0 2001 QJ96 2032-2032 1 9.0e-09 26.69 22.0 0.130 -5.94 -5.94 0 2005 NX55 2011-2102 85 3.1e-08 24.75 21.9 0.140 -5.26 -5.97 0 2006 CM10 2092-2092 1 1.7e-06 22.34 21.7 0.150 -4.15 -4.15 0 2004 GE2 2100-2100 1 1.9e-08 20.57 21.4 0.180 -6.02 -6.02 0 2007 CN26 2013-2106 112 7.5e-06 7.25 21.1 0.200 -3.39 -3.72 0 6344 P-L 2022-2052 2 2.8e-08 15.34 21.1 0.207 -5.43 -5.66 0 2006 CD 2008-2105 60 3.8e-08 11.20 21.0 0.212 -4.83 -4.98 0 99942 Apophis (2004 MN4) 2036-2037 2 2.2e-05 5.87 19.7 0.250 -2.52 -2.52 0 2007 CZ49 2058-2094 3 1.3e-08 12.19 20.6 0.260 -5.83 -5.90 0 2000 TU28 2104-2104 1 2.3e-07 9.47 20.4 0.280 -4.81 -4.81 0 2001 FB90 2021-2091 3 7.7e-09 26.56 19.9 0.345 -5.02 -5.13 0 2006 KF100 2017-2071 3 4.4e-10 16.09 19.7 0.390 -6.43 -6.60 0 2000 QS7 2053-2053 2 1.3e-06 12.32 19.6 0.420 -3.27 -3.46 0 2002 GJ8 2089-2089 1 1.6e-08 26.27 19.3 0.460 -4.91 -4.91 0 144898 2004 VD17 2102-2102 1 1.7e-08 18.22 18.9 0.580 -4.91 -4.91 0 2001 CA21 2020-2073 4 1.7e-08 30.66 18.5 0.678 -3.89 -4.10 0 1979 XB 2056-2101 3 3.3e-07 24.54 18.5 0.685 -3.07 -3.14 0 1998 HJ3 2100-2104 3 2.1e-07 24.09 18.4 0.694 -3.49 -3.69 0 2007 CA19 2012-2012 1 1.4e-06 27.26 17.7 0.990 -0.91 -0.91 1 2004 BX159 2009-2100 14 3.6e-09 13.97 17.2 1.200 -3.79 -3.94 0