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Blobrana · L

RE: Asteroid 2011 PE2

Blobrana · L

2011 PE2
Earth Impact Risk Summary

Torino Scale (maximum)	1
Palermo Scale (maximum)	-2.09
Palermo Scale (cumulative)	-2.09
Impact Probability (cumulative)	3.4e-04
Number of Potential Impacts	4

V_impact	14.82 km/s
V_infinity	9.77 km/s
H	23.0
Diameter	0.084 km
Mass	7.9e+08 kg
Energy	2.1e+01 MT
all above are mean values weighted by impact probability

Analysis based on
78 observations spanning 26.268 days
(2011-Aug-08.06387 to 2011-Sep-03.332193)

2011 PE2 Earth Impact Table
Date	Distance	Width	Sigma Impact	Stretch LOV	Impact Probability	Impact Energy	Torino Scale
`YYYY-MM-DD.DD`	(r_Earth)	(r_Earth)		(r_Earth)		(MT)
`2027-08-02.90`	`0.47`	`5.88e-03`	`0.000`	`1.02e+03`	`3.4e-04`	`2.07e+01`	`1`
`2090-08-02.21`	`0.44`	`5.89e-03`	`0.000`	`5.87e+05`	`6.6e-07`	`2.06e+01`	`0`
`2102-08-03.08`	`0.76`	`5.56e-03`	`0.000`	`1.80e+06`	`1.3e-07`	`2.06e+01`	`0`
`2103-08-03.49`	`0.25`	`5.85e-03`	`0.000`	`4.25e+05`	`1.4e-08`	`2.04e+01`	`0`

Blobrana · L

2011 PE2
Earth Impact Risk Summary

Torino Scale (maximum)	0
Palermo Scale (maximum)	-2.23
Palermo Scale (cumulative)	-2.23
Impact Probability (cumulative)	2.5e-04
Number of Potential Impacts	6

V_impact	14.82 km/s
V_infinity	9.77 km/s
H	23.0
Diameter	0.084 km
Mass	8.1e+08 kg
Energy	2.1e+01 MT
all above are mean values weighted by impact probability

Analysis based on
68 observations spanning 22.150 days
(2011-Aug-08.06387 to 2011-Aug-30.21401)

Blobrana · L

2011 PE2
Earth Impact Risk Summary

Torino Scale (maximum)	1
Palermo Scale (maximum)	-2.16
Palermo Scale (cumulative)	-2.15
Impact Probability (cumulative)	3.0e-04
Number of Potential Impacts	5

V_impact	14.82 km/s
V_infinity	9.77 km/s
H	23.0
Diameter	0.085 km
Mass	8.2e+08 kg
Energy	2.1e+01 MT
all above are mean values weighted by impact probability

Analysis based on
65 observations spanning 20.299 days
(2011-Aug-08.06387 to 2011-Aug-28.3627)

Blobrana · L

Orbital elements:
2011 PE2                                                 Earth MOID = 0.0049 AU
Epoch 2011 Aug. 27.0 TT = JDT 2455800.5                 MPC
M  13.32054              (2000.0)            P               Q
n   0.30741445     Peri.  337.27628     +0.30714481     +0.94569053
a   2.1743020      Node   310.43707     -0.85023514     +0.22243919
e   0.5428680      Incl.    8.03970     -0.42750705     +0.23704480
P   3.21           H   22.9           G   0.15           U   7

MPEC 2011 - P40

The 68 - 150 metre wide asteroid 2011 PE2 made a close pass (3.5 lunar distances, 0.0090 AU), travelling at 9.51 km/second, to the Earth-Moon system on the 30th July, 2011 @ 23:23 UT ±00:58.

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