Solar System
Dynamics
Group 		(144898) 2004 VD17

Asteroid 2004 VD17 was discovered on November 7, 2004 by the NASA-founded LINEAR asteroid survey.
This asteroid has led the Earth-impact hazard list since November 22, 2004.
On March 20, 2006, the observation arc of 2004 VD17 significantly increased from 487 to 1482 days because of additional reporting of precovery positions from February 16, 2002. In a consequence the impact risk dropped from the level 2 to level 1 in Torino Scale .
It has a diameter of about 320 meters and rotational period 1.99 hrs (De Luise et al. 2007, Icarus 191, 828-635).

Older results based on shorter arcs

Number of original observations: 981
Arc : 2002 02 16 - 2009 01 03
Nominal rms: 0″.25 (1928 residuals)

Possible collisions in: 2102, 2104





Year: 2102


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
 		 20090109

21020427		 1.508111191
17.81
1.502345237		 0.588824022
-14.08
0.588037772		 4.2227646
5.69
4.2296162		 224.2244621
13.09
222.5131249		 90.7113394
-8.12
92.5438676		 120.4630122
-17.81
327.7255225		 0″.28

 

Impact date: 2102 05 04.891(UT)   Vimpact= 21.634 km/sec   Ψimpact = 26°.56  

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: 2104


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
 		 20090109

21040427		 1.508111187
18.03
1.587192790		 0.588824027
-14.50
0.598451397		 4.2227653
5.34
4.1978695		 224.2244737
11.72
222.4801399		 90.7113266
-6.62
89.0973881		 120.4630160
-18.06
331.1141732		 0″.28

 

Impact date: 2104 05 04.371(UT)   Vimpact= 21.621 km/sec   Ψimpact = 26°.84  




External links:

2004 VD17 page (NASA JPL) and Impact Risk page NEO Program (NASA JPL)
2004 VD17 page and Impact Risk page at the NEO Dynamic Site (NEODyS)





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