Predictions for the Dynamical States of the Didymos System before and after the Planned DART Impact - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue The Planetary Science Journal Année : 2022

Predictions for the Dynamical States of the Didymos System before and after the Planned DART Impact

Derek C Richardson
Harrison F Agrusa
Brent Barbee
  • Fonction : Auteur
William F Bottke
Andrew F Cheng
Fabio Ferrari
Masatoshi Hirabayashi
Özgür Karatekin
  • Fonction : Auteur
Jay Mcmahon
Stephen R Schwartz
Ronald-Louis Ballouz
Adriano Campo Bagatin
Elisabetta Dotto
Eugene G Fahnestock
  • Fonction : Auteur
Oscar Fuentes-Muñoz
Ioannis Gkolias
  • Fonction : Auteur
Douglas P Hamilton
  • Fonction : Auteur
Seth A Jacobson
Martin Jutzi
Josh Lyzhoft
  • Fonction : Auteur
Rahil Makadia
Alex J Meyer
Patrick Michel
Ryota Nakano
Guillaume Noiset
Sabina D Raducan
Nicolas Rambaux
  • Fonction : Auteur
Alessandro Rossi
Paul Sánchez
Daniel J Scheeres
Stefania Soldini
Angela M Stickle
Paolo Tanga
Kleomenis Tsiganis
Yun Zhang

Résumé

NASA's Double Asteroid Redirection Test (DART) spacecraft is planned to impact the natural satellite of (65803) Didymos, Dimorphos, at around 23:14 UTC on 2022 September 26, causing a reduction in its orbital period that will be measurable with ground-based observations. This test of kinetic impactor technology will provide the first estimate of the momentum transfer enhancement factor β at a realistic scale, wherein the ejecta from the impact provide an additional deflection to the target. Earth-based observations, the LICIACube spacecraft (to be detached from DART prior to impact), and ESA's follow-up Hera mission, to launch in 2024, will provide additional characterizations of the deflection test. Together, Hera and DART comprise the Asteroid Impact and Deflection Assessment cooperation between NASA and ESA. Here, the predicted dynamical states of the binary system upon arrival and after impact are presented. The assumed dynamically relaxed state of the system will be excited by the impact, leading to an increase in eccentricity and a slight tilt of the orbit, together with enhanced libration of Dimorphos, with the amplitude dependent on the currently poorly known target shape. Free rotation around the moon's long axis may also be triggered, and the orbital period will experience variations from seconds to minutes over timescales of days to months. Shape change of either body, due to cratering or mass wasting triggered by crater formation and ejecta, may affect β, but can be constrained through additional measurements. Both BYORP and gravity tides may cause measurable orbital changes on the timescale of Hera's rendezvous.
Fichier principal
Vignette du fichier
Richardson_2022_Planet._Sci._J._3_157.pdf (1.9 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-03733191 , version 1 (21-07-2022)

Identifiants

Citer

Derek C Richardson, Harrison F Agrusa, Brent Barbee, William F Bottke, Andrew F Cheng, et al.. Predictions for the Dynamical States of the Didymos System before and after the Planned DART Impact. The Planetary Science Journal, 2022, 3 (7), pp.157. ⟨10.3847/psj/ac76c9⟩. ⟨hal-03733191⟩
90 Consultations
40 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More