Solar System
Dynamics
Group 		2011 UL21
older result

Asteroid 2011 UL21 is an Apollo asteroid discovered on October 17, 2011 by the Catalina Sky Survey. It has a diameter of about 2.5 kilometers.

Number of original observations: 81
Arc : 2011 10 17 - 2011 10 30
Nominal rms: 0″.38 (161 residuals)

Possible collision in: 2059





Year: 2059


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
 		 20111115

20590620		 2.062530526
4.20
2.060584939		 0.645840715
4.24
0.647357652		 34.8497040
0.26
34.9291776		 275.4748992
4.31
274.7902153		 285.6083369
-4.40
285.9403884		 344.7822327
4.37
12.9989116		 0″.40

 

Impact date: 2059 06 27.216 (UT)   Vimpact= 27.547 km/sec   Ψimpact = 6°.75  

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.



External links:

2011 UL21 page (NASA JPL) and Impact Risk page NEO Program (NASA JPL)
2011 UL21 page and Impact Risk page at the NEO Dynamic Site (NEODyS)




Solar System Dynamics & Planetology Group, 2011. All rights reserved