Influence of Planetary Encounters on the Magnitude of the Yarkovsky Effect in Asteroid Dynamics

Martyusheva, A. A.; Melnikov, A. V.

doi:10.1134/s0038094623050052

Cited by 4 publications

(2 citation statements)

References 41 publications

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“…В наших предыдущих работах (Лобанова и Мельников, 2023a (Мартюшева и Мельников, 2023;Martyusheva и Melnikov, 2023;Melnikov, 2022). Одной из целей данной работы было выявление отличий во влиянии тесного сближения с Землей на вращательную динамику и величину ЭЯ медленно вращающихся астероидов (D = 100-1000 м, P = 10-100 ч) и весьма малых астероидов с быстрым вращением (D ∼ 10 м, P < 1 ч).…”

Section: аннотацияunclassified

The influence of the rotation speed and shape of an asteroid on the magnitude of disturbances in its rotational dynamics during close approach to the Earth

Lobanova,

Melnikov

2024

Publ. Pulk. Obs.

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By means of numerical experiments, the influence of the value of the asteroid’s own rotational velocity, orientation of the axis of rotation, and figure parameters on the magnitude of perturbations in its rotational dynamics arising during close approach to the Earth is studied. Two cases are considered: 1) asteroid (99942) Apophis with a relatively slow rotation (period ≈ 30 h) and 2) asteroid 2012 TC4, which has a fast rotation (period ≈ 12 min). It was found that in the case of asteroids with slow rotation, perturbations can be large: in the case of Apophis, when approaching the Earth in 2029, changes in the rotational period ∆P may reach tens of hours, and deviations in the orientation of the axis of rotation ∆γ — tens of degrees. For fast-rotating asteroids, the perturbations are very small: in the case of asteroid 2012 TC4 at its approach to the Earth in 2017, |∆P | < 10−5 min, |∆γ| < 0.01◦. It is shown that for asteroids with slow rotation, the uncertainty in the determination of asteroid figure parameters (moments of inertia) can lead to noticeable inaccuracies in the estimation of perturbation magnitudes. The uncertainty in the knowledge of the figure parameters of a fast-rotating asteroid practically does not affect the estimation of perturbations in its rotational dynamics. In the case of Apophis, changes in the rotational velocity and orientation of the axis of rotation during the upcoming 2029 approach to the Earth may lead to a decrease in the value of the parameter A2, which characterizes the Yarkovsky effect, to −1.5 · 10−14 a.u./d2, or to an increase up to −3.5 · 10−14 a.u./d2. Perturbations in the rotational dynamics of asteroid 2012 TC4 during its approach to the Earth in 2017 did not affect the value of parameter A2.

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Section: аннотацияunclassified

The influence of the rotation speed and shape of an asteroid on the magnitude of disturbances in its rotational dynamics during close approach to the Earth

Lobanova,

Melnikov

2024

Publ. Pulk. Obs.

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“…В частности, вековое изменение орбиты астероида, вызванное действием эффекта Ярковского (ЭЯ), может увеличить риск катастрофического столкновения астероида с нашей планетой (Steven R. Chesley, 2006;Giorgini и др., 2008;Sokolov, Bashakov, Borisova и др., 2012;Shor и др., 2012;Farnocchia и др., 2013). В ходе орбитальной эволюции ряд астероидов испытывает регулярные тесные сближения с планетами, что существенным образом влияет на вращательную динамику астероидов (Scheeres, Ostro и др., 2000;Scheeres, Marzari и Rossi, 2004;Boldrin, Araujo и Winter, 2020;Melnikov, 2022) и, соответственно, на величины негравитационных эффектов для них (Мартюшева и Мельников, 2023;Martyusheva и Melnikov, 2023).…”

Section: Introductionunclassified

About the Yarkovsky effect in the dynamics of asteroid (99942) Apophis

Lobanova,

Melnikov

2023

Publ. Pulk. Obs.

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The influence of changes in the rotational state of asteroid (99942) Apophis during its next approach to the Earth in 2029 on the magnitude of the Yarkovsky effect acting in the orbital dynamics of the asteroid was studied. It is shown that changes in the speed of its own rotation and the orientation of the asteroid’s rotation axis, caused by a close approach to the Earth, can lead to variations in the magnitude of the Yarkovsky effect by several times. The average rate of annual change in the semimajor axis of Apophis’s orbit, caused by the Yarkovsky effect, after approach can range from −235 to −20 m/year.

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Disturbances in the Rotational Dynamics of Asteroid (99942) Apophis at its Approach to the Earth in 2029

Lobanova,

Melnikov

2024

Sol Syst Res

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Influence of Planetary Encounters on the Magnitude of the Yarkovsky Effect in Asteroid Dynamics

Cited by 4 publications

References 41 publications

The influence of the rotation speed and shape of an asteroid on the magnitude of disturbances in its rotational dynamics during close approach to the Earth

The influence of the rotation speed and shape of an asteroid on the magnitude of disturbances in its rotational dynamics during close approach to the Earth

About the Yarkovsky effect in the dynamics of asteroid (99942) Apophis

Disturbances in the Rotational Dynamics of Asteroid (99942) Apophis at its Approach to the Earth in 2029

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