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Article Dans Une Revue The Planetary Science Journal Année : 2023

The Perturbed Full Two-body Problem: Application to Post-DART Didymos

Alex J Meyer
Harrison F Agrusa
Derek C Richardson
R Terik Daly
  • Fonction : Auteur
Oscar Fuentes-Muñoz
Masatoshi Hirabayashi
Patrick Michel
Colby C Merrill
Ryota Nakano
Andrew F Cheng
Brent Barbee
  • Fonction : Auteur
Olivier S Barnouin
Steven R Chesley
Carolyn M Ernst
Ioannis Gkolias
Nicholas A Moskovitz
Shantanu P Naidu
Petr Pravec
Petr Scheirich
Cristina A Thomas
Kleomenis Tsiganis
Daniel J Scheeres

Résumé

With the successful impact of the NASA Double Asteroid Redirection Test (DART) spacecraft in the Didymos-Dimorphos binary asteroid system, we provide an initial analysis of the post-impact perturbed binary asteroid dynamics. To compare our simulation results with observations, we introduce a set of "observable elements" calculated using only the physical separation of the binary asteroid, rather than traditional Keplerian elements. Using numerical methods that treat the fully spin-orbit-coupled dynamics, we estimate the system's mass and the impact-induced changes in orbital velocity, semimajor axis, and eccentricity. We find that the changes to the mutual orbit depend strongly on the separation distance between Didymos and Dimorphos at the time of impact. If Dimorphos enters a tumbling state after the impact, this may be observable through changes in the system's eccentricity and orbit period. We also find that any DART-induced reshaping of Dimorphos would generally reduce the required change in orbital velocity to achieve the measured post-impact orbit period, and will be assessed by the ESA Hera mission in 2027. Unified Astronomy Thesaurus concepts: Asteroid dynamics (2210); Asteroid satellites (2207); Near-Earth objects (1092); Small Solar System bodies (1469); Gravitational interaction (669)
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hal-04267015 , version 1 (01-11-2023)

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Alex J Meyer, Harrison F Agrusa, Derek C Richardson, R Terik Daly, Oscar Fuentes-Muñoz, et al.. The Perturbed Full Two-body Problem: Application to Post-DART Didymos. The Planetary Science Journal, 2023, 4, ⟨10.3847/psj/acebc7⟩. ⟨hal-04267015⟩
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