Solar System
Dynamics
Group 		2008 ST7

The small asteroid 2008 ST7 was discovered on September 24, 2008 by the Mount Lemmon Survey, seventeen days after it had passed within 880 000 km of Earth.
It has a diameter of about 50 meters.

Number of original observations: 121
Arc : 2008 09 24 - 2008 11 01
Nominal rms: 0″.33 (231 residuals)

Possible collisions in: 2074, 2082, 2089, 2094A, 2094B, 2094C, 2100A, 2100B, 2102A, 2102B, 2105A, 2105B, 2105C





Year: 2074


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
 		 20081130

20740903		 1.934926255
-3.49
1.883455703		 0.514302739
-3.50
0.503106902		 2.4512140
-3.40
3.0463884		 347.8907846
0.83
346.7054758		 321.6145600
2.22
322.0387523		 40.8992677
3.49
8.7119709		 0″.35

 

Impact date: 2074 09 10.017 (UT)   Vimpact= 15.093 km/sec   Ψimpact = 30°.01  

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: 2082


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
 		 20081130

20820902		 1.930699223
12.15
1.870294530		 0.513176675
12.16
0.499906176		 2.4474670
12.23
2.7413794		 347.8922531
-2.94
346.4389049		 321.6199086
-7.01
321.8354266		 41.0363825
-12.17
8.5696594		 0″.44

 

Impact date: 2082 09 09.846 (UT)   Vimpact= 15.260 km/sec   Ψimpact = 16°.46  



Year: 2094


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
 		 20081130

20940903		 1.933010330
3.60
1.924863681		 0.513791927
3.60
0.512019171		 2.4495144
3.69
2.4697586		 347.8911792
-0.18
346.4493007		 321.6173434
-2.58
323.2924406		 40.9613570
-3.60
7.7409900		 0″.35

 

Impact date:2094 09 09.993 (UT)   Vimpact= 15.253 km/sec   Ψimpact = 55°.34  

 
dev/σ
 		 20081130

20940903		 1.934333324
-1.30
1.925112663		 0.514141067
-1.25
0.512156801		 2.4506854
-1.20
2.4700262		 347.8900623
2.69
346.5460823		 321.6165800
-1.27
323.2342684		 40.9185946
1.28
8.0889016		 0″.34

 

Impact date: 2094 09 10.065 (UT)   Vimpact= 15.307 km/sec   Ψimpact = 30°.99  

 
dev/σ
 		 20081130

20940903		 1.932592031
5.15
1.935888027		 0.513678217
5.18
0.514262471		 2.4491426
5.24
2.4642846		 347.8908060
0.78
346.4897453		 321.6185778
-4.71
323.6553566		 40.9750077
-5.16
7.9213360		 0″.36

 

Impact date: 2094 09 9.903 (UT)   Vimpact= 15.307 km/sec   Ψimpact = 48°.43  



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
 		 20081130

21000903		 1.933092689
3.29
1.988616234		 0.513811090
3.34
0.524893771		 2.4495778
3.42
2.3658086		 347.8904383
1.72
346.3609905		 321.6181767
-4.02
325.0260482		 40.9587869
-3.31
7.1026356		 0″.35

 

Impact date: 2100 09 10.301 (UT)   Vimpact= 14.845 km/sec   Ψimpact = 70°.37  

 
dev/σ
 		 20081130

21000903		 1.936135052
-7.96
1.953360181		 0.514619593
-7.90
0.517883553		 2.4522803
-7.85
2.4502423		 347.8894398
4.29
346.3789663		 321.6143288
2.62
324.0506601		 40.8603402
7.93
7.5584572		 0″.38

 

Impact date: 2100 09 10.370 (UT)   Vimpact= 15.153 km/sec   Ψimpact = 18°.65  



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
 		 20081130

21020903		 1.934667723
-2.53
1.925031038		 0.514234384
-2.55
0.511651182		 2.4510000
-2.51
2.4756686		 347.8911168
-0.02
346.2878802		 321.6146334
2.09
323.3884675		 40.9076106
2.54
7.7719581		 0″.34

 

Impact date: 2102 09 10.779 (UT)   Vimpact= 15.074 km/sec   Ψimpact = 27°.54  

 
dev/σ
 		 20081130

21020903		 1.934946008
-3.56
1.992689725		 0.514307326
-3.56
0.525011761		 2.4512222
-3.44
2.7764259		 347.8905479
1.44
346.2566253		 321.6148342
1.75
325.4927397		 40.8986466
3.56
6.8235412		 0″.35

 

Impact date: 2102 09 10.711 (UT)   Vimpact= 14.802 km/sec   Ψimpact = 78°.90  



Year: 2105


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
 		 20081130

21050903		 1.933253542
2.70
1.947304720		 0.513855986
2.71
0.516373119		 2.4497344
2.77
2.4437690		 347.8909093
0.51
346.4085104		 321.6173231
-2.55
323.9891652		 40.9534719
-2.70
7.5055389		 0″.46

 

Impact date: 2105 09 10.671 (UT)   Vimpact= 15.219 km/sec   Ψimpact = 45°.90  

 
dev/σ
 		 20081130

21050903		 1.934264938
-1.04
1.947304245		 0.514127232
-1.06
0.516439991		 2.4506353
-0.99
2.4441760		 347.8911565
-0.12
346.3590179		 321.6152378
1.05
324.0470385		 40.9206525
1.05
7.4991776		 0″.34

 

Impact date: 2105 09 10.702 (UT)   Vimpact= 15.296 km/sec   Ψimpact = 34°.63  

 
dev/σ
 		 20081130

21050903		 1.935282665
5.15
1.936152535		 0.514391689
5.18
0.514279882		 2.4515038
5.24
2.4584399		 347.8891462
0.78
346.5674387		 321.6161040
-4.71
323.5436702		 40.8879463
-5.16
7.6370722		 0″.36

 

Impact date: 2105 09 10.803 (UT)   Vimpact= 14.963 km/sec   Ψimpact = 48°.73  




External links:

2008 ST7 page (NASA JPL) and Impact Risk page NEO Program (NASA JPL)
2008 ST7 page and Impact Risk page at the NEO Dynamic Site (NEODyS)




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