* Astronomy

Blobrana · L

RE: Asteroid 2009 XR1

Blobrana · L

The 3.5 - 8.5 metre wide asteroid 2009 XR1 will made a close pass (2.0 lunar distances, 0.0050 AU), travelling at 6.43 km/second, to the Earth-Moon system on the 15th December, 2009.

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The Lunar Distance (LD), the distance between Earth and the Moon, equals 384,401 km, (or 0.00256 AU).

Blobrana · L

2009 XR1
Earth Impact Risk Summary

Torino Scale (maximum)	0
Palermo Scale (maximum)	-9.50
Palermo Scale (cumulative)	-8.88
Impact Probability (cumulative)	1.2e-07
Number of Potential Impacts	6

V_impact	12.67 km/s
V_infinity	6.03 km/s
H	29.3
Diameter	0.005 km
Mass	1.4e+05 kg
Energy	2.7e-03 MT
all above are mean values weighted by impact probability

Analysis based on
15 observations spanning .22732 days
(2009-Dec-11.14638 to 2009-Dec-11.3737)

Blobrana · L

Orbital elements:
2009 XR1                                                 Earth MOID = 0.0010 AU
Epoch 2010 Jan. 4.0 TT = JDT 2455200.5                  MPC
M 359.92394              (2000.0)            P               Q
n   0.45573110     Peri.  210.41020     -0.30686481     -0.95172300
a   1.6723619      Node   257.46108     +0.87477073     -0.27890090
e   0.4250678      Incl.    0.44442     +0.37498020     -0.12820931
P   2.16           H   29.2           G   0.15           U   7

MPEC 2009 - X36