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(99942) Apophis  ▹ 
IMPACTOR TABLE
Date MJD σ σimp Distance ± Width Stretching IP Exp. En. PS TS
(year-month-day) (RE) (RE/σ) (MT)
2056-04-13.098 72101.098 1.791 0.000 1.69 ± 0.000 9.99e+5 2.15e-7 1.63e-4 -4.48 0
2056-04-13.102 72101.102 1.791 0.000 1.78 ± 0.000 1.08e+6 1.96e-7 1.49e-4 -4.52 0
2065-04-13.132 75388.132 1.908 0.000 1.36 ± 0.000 2.04e+6 1.07e-7 8.07e-5 -4.87 0
2066-04-13.583 75753.583 1.904 0.000 1.92 ± 0.000 2.65e+6 4.81e-8 3.65e-5 -5.22 0
2068-04-12.633 76483.633 2.073 0.000 1.31 ± 0.009 6.75e+4 2.98e-6 2.26e-3 -3.45 0
2074-04-13.357 78675.357 1.889 0.000 0.36 ± 0.000 5.62e+6 5.12e-8 3.89e-5 -5.26 0
2076-04-12.700 79405.700 2.207 0.000 0.83 ± 0.000 4.48e+5 3.37e-7 2.55e-4 -4.45 0
2077-04-13.112 79771.112 2.068 0.000 1.29 ± 0.000 2.21e+6 7.44e-8 5.65e-5 -5.11 0
2078-04-13.376 80136.376 1.911 0.000 0.54 ± 0.000 2.10e+6 1.29e-7 9.77e-5 -4.88 0
2078-04-13.377 80136.377 1.911 0.000 1.34 ± 0.032 2.69e+6 9.78e-8 7.42e-5 -5.00 0

 

Based on 4765 optical observations (of which 3 are rejected as outliers) from 2004-03-15.109 to 2021-01-19.110.

Coordinates are given on the Target Plane
Unit is one Earth radius, but impact cross section has radius between 2.16 and 2.16 Earth radii

Coordinates for LOV = KEP scaled= T second= F

OrbFit software version= 5.0.5, 20/04/2017 Date of computation=20210120 140157.994 CET

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 (-2.84 +/- 0.38) 10-14 au/d2, so that no a priori constraint based upon models and physical observations has been used.

The results are in line with the ones obtained at JPL and NEOCC. Due to the already high precision orbit determination for Apophis, new optical observations at this apparition will not sensibly change the orbit and, therefore, the impact monitoring computations. For this reason we will update occasionally this table during the following weeks.