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- W4305009355 abstract "We used the times of occultations and eclipses between the components of the 65803 Didymos binary system observed in its lightcurves from 2003-2021 to estimate the orbital parameters of Dimorphos relative to Didymos. We employed a weighted least-squares approach and a modified Keplerian orbit model in order to accommodate the effects from non-gravitational forces such as Binary YORP that could cause a linear change in mean motion over time. We estimate that the period of the mutual orbit at the epoch 2022 September 26.0 TDB, the day of the DART impact, is $11.9214869 pm 0.000028$~h ($1sigma$) and that the mean motion of the orbit is changing at a rate of $(5.0pm 1.0)times 10^{-18}$~rad s$^{-2}$ $(1sigma$). The formal $3sigma$ uncertainty in orbital phase of Dimorphos during the planned Double Asteroid Redirection Test (DART) mission is $5.4^circ$. Observations from July to September 2022, a few months to days prior to the DART impact, should provide modest improvements to the orbital phase uncertainty and reduce it to about $4.2^circ$. These results, generated using a relatively simple model, are consistent with those generated using the more sophisticated model of citet{scheirich22}, which demonstrates the reliability of our method and adds confidence to these mission-critical results." @default.
- W4305009355 created "2022-10-14" @default.
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- W4305009355 date "2022-10-10" @default.
- W4305009355 modified "2023-09-25" @default.
- W4305009355 title "Anticipating the DART impact: Orbit estimation of Dimorphos using a simplified model" @default.
- W4305009355 doi "https://doi.org/10.48550/arxiv.2210.05101" @default.
- W4305009355 hasPublicationYear "2022" @default.
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