As a near Earth asteroid(NEA)having potential threat to impact the Earth,asteroid(99942)Apophis has been concerned widely since its discovery.During close encounters with the Earth,the orbit of Apophis is disturbed by the gravitational environment of the Earth-Moon system significantly.The author firstly analyzes the influences of the uncertainties of solar system ephemerides on the orbital motion of Apophis.The orbit of Apophis and Yarkovsky parameter A2 are determined with the optical and radar observations from 2004 to 2021.The result presents that adoption of the data observed in 2021 significantly improves the orbit precision of Apophis and the signal noise rate(SNR)of detecting of Yarkovsky effect.The orbit error of Apophis from 2004 to 2022 is smaller than 10km(9σ),and the measured Yarkovsky parameter A2=-2.73±0.12(the corresponding SNR ~22.8).
TIAN Wei
. Orbit Improvement and Determination of Yarkovsky Effect For Asteroid(99942)Apophis[J]. Journal of Space Science and Experiment, 2021
, 21(4)
: 37
-44
.
DOI: 10.19963/j.cnki.2096-4099.2021.04.006
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