Solar System
Dynamics
Group 		2008 AF4


Asteroid 2008 AF4 was discovered on January 10, 2008 by the NASA-founded LINEAR asteroid survey. It has a diameter of about 340—770 meters.

Number of original observations: 610
Arc : 2008 01 10 - 2008 05 20
Nominal rms: 0″.33 (1209 residuals)

Possible collisions in: 2099, 2100





Year: 2099


Orbital elements of impact orbit for two dates (equ. J2000)

Epoch [TT] a [AU] e i [deg] Ω [deg] ω [deg] M [deg] rms
 
dev/σ
 		 20080623

20990102		 1.382541284
-7.99
1.386106525		 0.410729606
-7.94
0.411537082		 8.9198490
-7.29
8.9291090		 109.4301821
-4.46
108.7135967		 293.3347742
-0.57
294.4453396		 130.7439128
8.00
23.5630140		 0″.35

 

Impact date: 2099 01 09.970 (UT)   Vimpact= 15.930 km/sec   Ψimpact = 0°.54  

dev/σ
Deviation from the nominal orbit parameter divided by the respective uncertainty.
Vimpact
The velocity of the asteroid relative to the Earth at the moment of impact.
Ψimpact
The impact angle is measured from the vertical axis that goes through the impact point. Thus, the impact angle is 0 degrees for a vertical impact.
rms
Root mean square for the derived impact orbit.

Year: 2100


Orbital elements of impact orbit for two dates (equ. J2000)

Epoch [TT] a [AU] e i [deg] Ω [deg] ω [deg] M [deg] rms
 
dev/σ
 		 20080623

21000103		 1.382526173
-1.96
1.359046662		 0.410721421
-1.98
0.404247977		 8.9197146
-2.05
9.0690084		 109.4301448
-0.91
108.6974362		 293.3347456
0.60
292.6430110		 130.7462217
1.94
24.8410565		 0″.34

 

Impact date: 2100 01 10.213 (UT)   Vimpact= 15.919 km/sec   Ψimpact = 6°.70  




External links:

2008 AF4 page (NASA JPL) and Impact Risk page NEO Program (NASA JPL)
2008 AF4 page and Impact Risk page at the NEO Dynamic Site (NEODyS)




Solar System Dynamics & Planetology Group, 2008. All rights reserved