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#dartmission

1 post1 participant0 posts today
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Michael Busch

Today on the #arXiv :

Langner et al. 2025, "Secondary impact debris in the Didymos system: what could be observed by Hera?" - arxiv.org/abs/2503.08158

Describing possibilities for the #HeraMission observing lingering debris from the #DARTMission impact hitting one of the asteroids.

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arXiv.orgSecondary impact debris in the Didymos system: what could be observed by Hera?We investigate the effects of low--velocity impacts of rocks and boulders, originally released after the DART impact, on the surface of Didymos and the dynamics of dust particles released by those impacts. We determine if any of those effects can be observed by the Hera mission. The iSALE-2D shock physics code was used to simulate the re-impacts of boulders on the surface of the asteroid. To model the dynamics of the boulders, we used a numerical model that includes the gravity of non-spherical Didymos and Dimorphos, the solar gravity, and the radiation pressure. The sesquinary impacts can result in small, shallow craters on the surface of Didymos. For the given low impact speeds, the ejected mass depends mostly on the boulder mass. Ejection speeds range from 10 \% to 80 \% of the impact speed. The majority of the ejected dust falls back covering a large area of the surface, mostly at low/medium latitudes. Less than 20 \% of the ejected dust is escaping the system after a few days. The space surrounding the asteroids becomes free from dust after 15-30 days following each sesquinary impact. Results. The sesquinary impacts can result in small, shallow craters on the surface of Didymos. For the given low impact speeds, the ejected mass depends mostly on the boulder mass. Ejection speeds range from 10 \% to 80 \% of the impact speed. The majority of the ejected dust falls back covering a large area of the surface, mostly at low and medium latitudes. Less than 20 \% of the ejected dust is escaping the system after a few days. The space surrounding the asteroids becomes free from dust after 15-30 days following each sesquinary impact.
Public
Michael Busch

Today on the #arXiv :

Richardson et al. 2025, "The Dynamical State of the Didymos System Before and After the DART Impact" - arxiv.org/abs/2502.14990

Reviewing the results of the #DARTMission impact.

"The largest uncertainty in the momentum transfer enhancement factor of the DART impact remains the mass of Dimorphos, which will be resolved by the #HeraMission ."

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arXiv.orgThe Dynamical State of the Didymos System Before and After the DART ImpactNASA'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 pre-encounter paper Richardson (2022), predictions were put forward regarding the pre- and post-impact 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 with arrival in late December 2026. Pre-encounter 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 pre-impact 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 post-impact 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.
Public
Michael Busch

Today in the Planetary Science Journal:

Stickle et al. 2025, "Dimorphos's Material Properties and Estimates of Crater Size from the DART Impact" - iopscience.iop.org/article/10.

Estimating the crater diameter from the #DARTMission impact as 40-60 m and awaiting constraints by the #HeraMission .

As an aside:

This is why I wonder about the risk of the pending CNSA asteroid deflection demonstration shattering its target object.

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Public
Michael Busch

#DPS2024 and #TeamRadar continued:

@PlanetTreky et al., "On the Radar Detectability of Near-Earth Asteroid Surface Refreshing Processes" - submissions.mirasmart.com/DPS5

Zambrano-Marin et al., "Shape and Mutual Orbit Modeling of Binary Near-Earth Asteroid 2020 BX12" - submissions.mirasmart.com/DPS5

Naidu et al., "Orbital and physical characterization of asteroid Dimorphos following the DART impact" - submissions.mirasmart.com/DPS5

#DARTMission .

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Public
Michael Busch

NASA and ESA, while Obama happened to be POTUS:

Start the #DARTMission to demonstrate asteroid deflection; buying a Falcon 9 from SpaceX for DART.

ESA and NASA, while Biden happened to be POTUS:

Switch the #HeraMission to further study asteroid deflection from an Ariane to a Falcon 9 that will be launched from Canaveral next week.

Elon Musk, then and now:

Lying about the asteroid impact hazard and about what his own company is doing for the sake of endangering workers.

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