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#asteroid

4 posts4 participants0 posts today
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Benjamin Carr, Ph.D. 👨🏻‍💻🧬

Origins of #Water on #Earth May Not Have Started with an #Asteroid Impact
They examined a rare type of #meteorite — known as an enstatite chondrite — that was built similarly to early Earth 4.5 billion years ago and the team discovered hydrogen present in the chemical. The logic is that if this material resembling early Earth's composition can contain hydrogen, so too could the young planet....
discovermagazine.com/the-scien

Discover Magazine · Origins of Water on Earth May Not Have Started with an Asteroid ImpactBy Paul Smaglik
Public
Daniel Fischer

Orbits of very distant #asteroid satellites: aanda.org/articles/aa/full_htm -> "The very wide binary asteroid (VWBA) population is a small subset of the population of known binary and multiple asteroids made of systems with very widely orbiting satellites and long orbital periods, on the order of tens to hundreds of days. The origin of these systems is debatable, and most members of this population are poorly characterized."

www.aanda.orgOrbits of very distant asteroid satellites | Astronomy & Astrophysics (A&A)Astronomy & Astrophysics (A&A) is an international journal which publishes papers on all aspects of astronomy and astrophysics
Public
Benjamin Carr, Ph.D. 👨🏻‍💻🧬

Probability of #Asteroid #2024YR4 hitting the #Moon increases
Scientists improve knowledge by 20% thanks to #JamesWebb #Space #Telescope data
#NASA said data from the #JWST "improved our knowledge of where the asteroid will be on Dec. 22, 2032, by nearly 20 percent." The upshot is that there is now a 4.3% possibility that the asteroid will hit the Moon in 7.5 years' time, although it wouldn't alter the natural satellite's orbit.
theregister.com/2025/06/10/ast

The Register · Probability of Asteroid 2024 YR4 hitting the Moon increasesBy Richard Speed
Public
Benjamin Carr, Ph.D. 👨🏻‍💻🧬

#China extends its reach into the Solar System with launch of #asteroid mission
China has two objectives for #Tianwen2. First it will fly to mnear-Earth asteroid designated 469219 Kamoʻoalewa, or 2016 HO3. Once there, it will retrieve a rocky sample from the surface and bring material back to Earth in late 2027. After the spacecraft releases its sample carrier to land on Earth, Tianwen-2 will change course and head to mysterious comet-like object between Mars and Jupiter.
arstechnica.com/science/2025/0

Ars Technica · China extends its reach into the Solar System with launch of asteroid missionBy Stephen Clark
Replied in thread
Public
Lauri Siltala

@jannem Both sampling across the entire rotation phase and multiple viewing angles (orientation of an #asteroid relative to Earth is never constant)! are critical.

#radar data in use here is all from #Arecibo - the LPI has most of it at lpi.usra.edu/resources/asteroi if you want to see. With these observations, one beams a radio signal to the asteroid and observes the echo returned. Interesting observed parameters include Doppler shift, polarization and echo power.

Replied in thread
Public
Spaceflight 🚀

In 2005, the #US Congress laid out a clear mandate: the nation should be able to detect, track, catalog, and characterize no less than 90 percent of all #NEO at least 140 meters 📏 across.

As of today, we have identified less than half and characterized only a small percentage 📊 of those possible threats. Even if we did have a full census, we do not have the #capabilities to rapidly respond to an Earth-intersecting #asteroid ☄️arstechnica.com/science/2024/0

Ars Technica · Outdoing the dinosaurs: What we can do if we spot a threatening asteroidBy Paul Sutter
#AsteroidThreat
Public
Matteo Ceriotti

Edward Tomanek-Volynets' #PhD #research has just been published:

"The pointer network for reward maximisation in multi-target
space mission sequence selection"

This work uses machine learning to optimise sequences of targets to visit in a multi-target #space mission, for example #asteroid rendezvous, #spacedebris removal, or #satellite servicing.

#free #OpenAccess:
doi.org/10.1016/j.asr.2025.04.

Congrats Edward! 🎓

Multi-target space mission scenarios such as asteroid rendezvous, debris removal or satellite servicing, require targeting several orbits in a single mission, often to be selected among a large set, and therefore choosing optimal sequences of these orbits to be visited. This paper demonstrates a reinforcement-learning-based framework for selecting the sequence of targets to be visited in large-scale multitarget mission optimisation problems. The sequence selection is a NP-hard combinatorial optimisation problem. The proposed method builds upon a neural network architecture for combinatorial optimisation originally developed for Euclidean problems, to produce estimates of the optimal sequence of targets in very short amounts of time. The neural network is trained using a policy-gradient reinforcement-learning approach. Once training is complete, the network can be evaluated in two ways: one of these (greedy decoding) produces solutions on average 15% less optimal than Ant Colony Optimisation (ACO); the other (stochastic search) is on average 5% less optimal than ACO, using an iterative process that is slower than greedy decoding but still orders of magnitude faster than ACO. The quality of the network’s solutions is shown both averaged over large amounts of problems, and demonstrated more closely on a few specific instances.
#ML#AI#engineering
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IOTA European Section

Do you want to know how an observation of a stellar occultation by an asteroid is done? Watch P. Nosworthy's (Australia) recording of his live broadcast of an occultation by asteroid Swissair and you will get an impression of this exiting field of citizen science. Broadcast starts at 5:05.

youtube.com/watch?v=_rSmbqoeQ5U

YouTubeOccultation by Swissair - 100% ProbabilityBy The Wonky Astronomer
#astronomy#citizenscience#asteroid
Public
Flipboard Science Desk

NASA’s Lucy spacecraft beams back pictures of an asteroid shaped like a lumpy bowling pin.

From @AssociatedPress: "Lucy passed within 600 miles (960 kilometers) of the harmless asteroid known as Donaldjohanson on Sunday in the main asteroid belt between Mars and Jupiter."

flip.it/6Xv-Wc

AP News · NASA's Lucy spacecraft beams back pictures of an asteroid shaped like a lumpy bowling pinBy Marcia Dunn
#NASA#Space#Asteroid
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