Last update: 2021-03-05 15:02 UTC
Summary
Orbit Properties
Physical Properties
Observations
Ephemerides
Close Approaches
Possible Impacts
 
99942 Apophis
Date MJD σ σ_imp
Distance ± Width
(RE)
Stretching
(RE/σ)
IP
Exp. Energy
(MT)
PS TS
2056-04-13.094 72101.094 2.221 0.000 1.84 ± 0.000 5.42E5 1.70E-7 1.29E-4 -4.55 0
2065-04-13.131 75388.131 2.430 0.000 1.37 ± 0.001 1.20E6 5.85E-8 4.43E-5 -5.10 0
2068-04-12.634 76483.634 2.723 0.000 1.74 ± 0.006 3.86E4 1.09E-6 8.30E-4 -3.86 0
2074-04-13.359 78675.359 2.396 0.000 1.35 ± 0.008 3.28E6 2.91E-8 2.21E-5 -5.48 0
2075-04-13.212 79040.212 1.356 0.000 1.68 ± 0.007 2.13E6 3.22E-7 2.44E-4 -4.44 0
2077-04-13.112 79771.112 2.714 0.000 1.63 ± 0.000 1.31E6 2.66E-8 2.02E-5 -5.54 0
2098-10-16.481 87627.481 2.398 0.000 1.60 ± 0.011 1.19E6 7.70E-8 5.83E-5 -5.21 0
2103-04-14.311 89267.311 2.706 0.000 2.00 ± 0.001 4.94E5 5.44E-8 4.12E-5 -5.38 0
Based on 4714 optical observations (of which 3 are rejected as outliers) and 46 radar observations from 2004/03/15.108 to 2021/01/17.569.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 2.15 and 2.16 Earth radii. Coordinates for LOV = KEP scaled= 2 second= F.
AstOD software version= 2.0, Date of computation=20210119 112012.088 UTC.

ADDITIONAL NOTE

The results contained in this impactor table are based on the Line Of Variations method generalised to the 7-dimensional space of the orbital elements and the Yarkovsky parameter. The Yarkovsky parameter has been estimated from the fit to the astrometry as (-2.65+/- 0.23) 10-14 au/d2.

The results are compatible with the ones obtained at JPL and NEODyS.