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#dartmission

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Öffentlich
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.

iopscience.iop.orgRadware Bot Manager Captcha
Fortgeführter Thread
Öffentlich
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.

Öffentlich
SETI Institute

#PPOD: Asteroid moonlet Dimorphos as seen by the DART spacecraft 11 seconds before impact. DART’s onboard DRACO imager captured this image from a distance of 42 miles (68 kilometers). This image was the last to contain all of Dimorphos in the field of view. Dimorphos is roughly 525 feet (160 meters) in length. This image is shown as it appears on the DRACO detector and is mirror-flipped across the x-axis from reality. Credit: NASA/Johns Hopkins APL

The entire rocky surface of asteroid moonlet Dimorphos is seen in this image, lit by the Sun and surrounded by the black of space. The asteroid is roughly oval at this angle and covered in jagged rocks and boulders.
#dartmission#planetarydefense#scicomm
Öffentlich *
Michael Busch

Today on the arXiv:

@matijacuk et al. 2024, "BYORP and Dissipation in Binary Asteroids: Lessons from DART" - arxiv.org/abs/2406.20064 .

#DARTMission science with predictions for the #HeraMission .

@setiinstitute

arXiv.orgBYORP and Dissipation in Binary Asteroids: Lessons from DARTThe Near-Earth binary asteroid Didymos was the target of a planetary defense demonstration mission DART in September 2022. The smaller binary component, Dimorphos, was impacted by the spacecraft in order to measure momentum transfer in kinetic impacts into rubble piles. DART and associated Earth-based observation campaigns have provided a wealth of scientific data on the Didymos-Dimorphos binary. DART revealed a largely oblate and ellipsoidal shape of Dimorphos before the impact, while the post-impact observations suggest that Dimorphos now has a prolate shape. Here we add those data points to the known properties of small binary asteroids and propose new paradigms of the radiative binary YORP (BYORP) effect as well as tidal dissipation in small binaries. We find that relatively spheroidal bodies like Dimorphos made of small debris may experience a weaker and more size-dependent BYORP effect than previously thought. This could explain the observed values of period drift in several well-characterized binaries. We also propose that energy dissipation in small binaries is dominated by relatively brief episodes of large-scale movement of (likely surface) materials, rather than long-term steady-state tidal dissipation. We propose that one such episode was triggered on Dimorphos by the DART impact. Depending on the longevity of this high-dissipation regime, it is possible that Dimorphos will be more dynamically relaxed in time for the Hera mission than it was in the weeks following the impact.
Fortgeführter Thread
Öffentlich *
Michael Busch

Agata Rożek describes current plans for Earth-based lightcurve observations of #Didymos this year; to give a midpoint between the #DARTMission and the #HeraMission.

She also notes an occultation on 2024 August 13, if anyone near #Perth wants to chase it: asteroidoccultation.com/2024/2

Addendum:

Further details on Didymos occultation observation opportunities in Australia this year, via Kleomenios Tsiganis - lagrange.oca.eu/fr/blog

Öffentlich
Scientific European

Planetary Defence: DART Impact Changed both Orbit and Shape of asteroid 
In the last 500 million years, there have been at least five episodes of mass extinctions of life-forms on the Earth when more than three-quarters of...........
#Asteroid #DARTmission #NASA #nearEarthasteroid #NEO #Planetarydefence
SCIEU Team

scientificeuropean.co.uk/scien

Öffentlich
Fraser Cain

Dimorphos's Orbit Might Be Continuing to Decay, a Year After the DART Impact

After NASA's DART mission slammed into asteroid Dimorphous in September 2022, astronomers measured that the orbital period had decreased by about 32 minutes. The dinosaurs were avenged. Astronomers measured the orbital period a month later and discovered that it had increased to 34 minutes - 2 minutes longer than the first measurements. Even though it was a single impact from DART, some force continued to slow the asteroid's orbit, and astronomers don't know what that mechanism might be.

#dartmission

arxiv.org/abs/2308.15488

Schematic of the DART mission shows the impact on the moonlet of asteroid (65803) Didymos. Post-impact observations from Earth-based optical telescopes and planetary radar would, in turn, measure the change in the moonlet’s orbit about the parent body.
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