Constraints on the perturbed mutual motion in Didymos due to impact-induced deformation of its primary after the DART impact - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2017

Constraints on the perturbed mutual motion in Didymos due to impact-induced deformation of its primary after the DART impact

Masatoshi Hirabayashi
Stephen Schwartz
Yang Yu
Alex Davis
  • Fonction : Auteur
Steven Chesley
Eugene Fahnestock
  • Fonction : Auteur
Derek Richardson
Shantanu Naidu
Daniel Scheeres
  • Fonction : Auteur
Andrew Cheng
  • Fonction : Auteur
Andrew Rivkin
  • Fonction : Auteur
Lance Benner
  • Fonction : Auteur
Patrick Michel

Résumé

Binary near-Earth asteroid (65803) Didymos is the target of the proposed NASA Double Asteroid Redirection Test (DART), part of the Asteroid Impact & Deflection Assessment (AIDA) mission concept. In this mission, the DART spacecraft is planned to impact the secondary body of Didymos, perturbing mutual dynamics of the system. The primary body is currently rotating at a spin period close to the spin barrier of asteroids, and materials ejected from the secondary due to the DART impact are likely to reach the primary. These conditions may cause the primary to reshape, due to landslides or internal deformation, changing the permanent gravity field. Here, we propose that if shape deformation of the primary occurs, the mutual orbit of the system would be perturbed due to a change in the gravity field. We use a numerical simulation technique based on the full two-body problem to investigate the shape effect on the mutual dynamics in Didymos after the DART impact. The results show that under constant volume, shape deformation induces strong perturbation in the mutual motion. We find that the deformation process always causes the orbital period of the system to become shorter. If surface layers with a thickness greater than ∼0.4 m on the poles of the primary move down to the equatorial region due to the DART impact, a change in the orbital period of the system and in the spin period of the primary will be detected by ground-based measurement.
Fichier principal
Vignette du fichier
stx1992.pdf (1.21 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-03638448 , version 1 (12-04-2022)

Identifiants

Citer

Masatoshi Hirabayashi, Stephen Schwartz, Yang Yu, Alex Davis, Steven Chesley, et al.. Constraints on the perturbed mutual motion in Didymos due to impact-induced deformation of its primary after the DART impact. Monthly Notices of the Royal Astronomical Society, 2017, 472 (2), pp.1641-1648. ⟨10.1093/mnras/stx1992⟩. ⟨hal-03638448⟩
16 Consultations
8 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More