Título:
The dynamical state of the Didymos System before and after the DART impact
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Autor:
Richardson, Derek C.
Agrusa, Harrison F.
Barbee, Brent W.
Tancredi Machado, Gonzalo José
Agrusa, Harrison F.
Barbee, Brent W.
Tancredi Machado, Gonzalo José
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Artículo
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Palabras clave:
Asteroids
Asteroid Dynamics
Asteroid satellites
Asteroid Dynamics
Asteroid satellites
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Año de publicación:
2024
Contenido:
Resumen:
NASA’s Double Asteroid Redirection Test (DART) spacecraft impacted Dimorphos, the natural satellite of (65803) Didymos, on 2022 September 26, as a first successful test of kinetic impactor technology for deflecting a potentially hazardous object in space. The experiment resulted in a small change to the dynamical state of the
Didymos system consistent with expectations and Level 1 mission requirements. In the preencounter paper,
predictions were put forward regarding the pre- and postimpact dynamical state of the Didymos system. Here we
assess these predictions, update preliminary findings published after the impact, report on new findings related to
dynamics, and provide implications for ESA’s Hera mission to Didymos, scheduled for launch in 2024 October
with arrival in 2026 December. Preencounter predictions tested to date are largely in line with observations, despite the unexpected, flattened appearance of Didymos compared to the radar model and the apparent preimpact oblate shape of Dimorphos (with implications for the origin of the system that remain under investigation). New findings include that Dimorphos likely became prolate due to the impact and may have entered a tumbling rotation state. A possible detection of a postimpact transient secular decrease in the binary orbital period suggests possible dynamical coupling with persistent ejecta. Timescales for damping of any tumbling and clearing of any debris are uncertain. The largest uncertainty in the momentum transfer enhancement factor of the DART impact remains the mass of Dimorphos, which will be resolved by the Hera mission.
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Este artículo fue escrito por más de cincuenta autores
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EN:
The Planetary Science Journal, 2024, 5(8): 182
Financiadores:
ANII: FCE_1_2019_1_156451
Citación:
Richardson, D, Agrusa, H, Barbee, B [y otros autores]. "The dynamical state of the Didymos System before and after the DART impact". The Planetary Science Journal. [en línea] 2024, 5(8): 182. 24 h. DOI. 10.3847/PSJ/ad62f5
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2632-3338
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Licencia Creative Commons Atribución (CC - By 4.0)
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| Ficheros | Descripción | Tamaño | Formato | ||
|---|---|---|---|---|---|
| 10.3847-PSJ-ad62f5.pdf | — | 1.6 MB | Adobe PDF |