Assessing possible mutual orbit period change by shape deformation of Didymos after a kinetic impact in the NASA-led Double Asteroid Redirection Test

Hirabayashi, Masatoshi; Davis, A. B.; Fahnestock, Eugene G.; Richardson, D. C.; Michel, Patrick; Cheng, A. F.; Rivkin, Andrew S.; Scheeres, Daniel J.; Chesley, Steven R.; Yu, Yang; Naidu, Shantanu P.; Schwartz, S. R.; Benner, L. A. M.; Pravec, Petr; Stickle, A. M.; Jutzi, Martin

doi:10.1016/j.asr.2018.12.041

Cited by 23 publications

(25 citation statements)

References 41 publications

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“…DART will send a spacecraft that impacts Dimorphos, the secondary of the Didymos system, in 2022 (Cheng et al, 2018), to assess the DART spacecraft's deflection capability while Hera will later conduct remote sensing observations after rendezvousing with it in 2026 (Michel et al, 2020b). Studies have shown that the deflection capability strongly depends on the environments and physical properties of the target asteroid, implying that detailed analyses are necessary to employ proper asteroid deflection technologies (Agrusa et al, 2020;Hirabayashi et al, 2019aHirabayashi et al, , 2017Raducan et al, 2020Raducan et al, , 2019Stickle et al, 2020).…”

Section: Planetary Defensementioning

confidence: 99%

Hayabusa2 extended mission: New voyage to rendezvous with a small asteroid rotating with a short period

Hirabayashi

Mimasu

Sakatani

et al. 2021

Advances in Space Research

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Section: Planetary Defensementioning

confidence: 99%

Hayabusa2 extended mission: New voyage to rendezvous with a small asteroid rotating with a short period

Hirabayashi

Mimasu

Sakatani

et al. 2021

Advances in Space Research

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“…While previous studies have characterized the coupled dynamics of Didymos (Hirabayashi et al 2019;Agrusa et al 2020;Naidu et al 2020), they do not provide the complete picture. In particular, while the libration of Dimorphos has been studied extensively (Agrusa et al 2021), the libration's effect on the orbit dynamics has not been investigated in the same level of detail.…”

Section: Introductionmentioning

confidence: 99%

Libration-induced Orbit Period Variations Following the DART Impact

et al. 2021

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The Double Asteroid Redirection Test (DART) mission will be the first test of a kinetic impactor as a means of planetary defense. In late 2022, DART will collide with Dimorphos, the secondary in the Didymos binary asteroid system. The impact will cause a momentum transfer from the spacecraft to the binary asteroid, changing the orbit period of Dimorphos and forcing it to librate in its orbit. Owing to the coupled dynamics in binary asteroid systems, the orbit and libration state of Dimorphos are intertwined. Thus, as the secondary librates, it also experiences fluctuations in its orbit period. These variations in the orbit period are dependent on the magnitude of the impact perturbation, as well as the system’s state at impact and the moments of inertia of the secondary. In general, any binary asteroid system whose secondary is librating will have a nonconstant orbit period on account of the secondary’s fluctuating spin rate. The orbit period variations are typically driven by two modes: a long period and a short period, each with significant amplitudes on the order of tens of seconds to several minutes. The fluctuating orbit period offers both a challenge and an opportunity in the context of the DART mission. Orbit period oscillations will make determining the post-impact orbit period more difficult but can also provide information about the system’s libration state and the DART impact.

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“…Usually there are strong spin-orbit cou-pling in binary asteroid systems (Maciejewski 1995;Scheeres 2004;Scheeres et al 2006;Fahnestock & Scheeres 2006;Chappaz & Howell 2015;Ferrari et al 2016;Shi Y. 2017;Hirabayashi et al 2019). The assumption of an invariant mutual orbit may cause qualitative difference from the real physics when studying spin-orbit coupling in these systems .…”

Section: Introductionmentioning

confidence: 99%

On the secondary’s rotation in a synchronous binary asteroid

Wang

Hou

2020

Monthly Notices of the Royal Astronomical Society

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This paper studies the secondary's rotation in a synchronous binary asteroid system in which the secondary enters the 1:1 spin-orbit resonance. The model used is the planar full two-body problem composed of a spherical primary plus a tri-axial ellipsoid secondary. Compared with classical spin-orbit work, there are two differences: (1) Influence on the mutual orbit from the secondary's rotation is considered; (2) Instead of the Hamiltonian approach, the approach of periodic orbits is adopted. Our studies find: (1) Genealogy of the two families of periodic orbits is same as that of the families around triangular libration points in the restricted three-body problem. That is, the long-period family terminates onto a short-period orbit travelling N times; (2) In the limiting case where the secondary's mass is negligible, our results can be reduced to the classical spin-orbit theory, by equating the long-period orbit with the free libration, and by equating the short-period orbit with the forced libration caused by orbit eccentricity. However, the two models show obvious differences when the secondary's mass is non-negligible. (3) By studying the stability of periodic orbits, for a specific binary asteroid system, we are able to obtain the maximum libration amplitude of the secondary (which is usually less than 90°), and the maximum mutual orbit eccentricity which does not break the secondary's synchronous state. We also find the anti-correlation between the secondary's libration amplitude and the orbit eccentricity. The (65803) Didymos system is taken as an example to show the results.

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Assessing possible mutual orbit period change by shape deformation of Didymos after a kinetic impact in the NASA-led Double Asteroid Redirection Test

Cited by 23 publications

References 41 publications

Hayabusa2 extended mission: New voyage to rendezvous with a small asteroid rotating with a short period

Hayabusa2 extended mission: New voyage to rendezvous with a small asteroid rotating with a short period

Libration-induced Orbit Period Variations Following the DART Impact

On the secondary’s rotation in a synchronous binary asteroid

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