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#asteroids

1 post1 participant0 posts today
Public
Daniel Fischer

Diverse evolutionary pathways of spheroidal #asteroids driven by rotation rate: nature.com/articles/s41598-025 -> "we show that (101955) Bennu and (162173) Ryugu, two near-Earth asteroids with spheroidal shapes, have evolved through distinct pathways despite their similar shapes. [...] Our findings demonstrate that small variations in rotation period, on the scale of a few hours, can drastically change the gravitational field on an asteroid, sometimes even reversing local gravity direction."

NatureDiverse evolutionary pathways of spheroidal asteroids driven by rotation rate - Scientific ReportsAsteroids preserve a continuous record of evolutionary processes since the early solar system. They can take various shapes that represent the cumulative results of their evolution. However, for those showing common characteristics, this does not mean that they followed the same evolutionary path. Here, we show that (101955) Bennu and (162173) Ryugu, two near-Earth asteroids with spheroidal shapes, have evolved through distinct pathways despite their similar shapes. Using high-resolution imagery from NASA’s OSIRIS-REx and JAXA’s Hayabusa2 spacecraft, we map ~ 200,000 boulders and find latitudinal particle size sorting on both bodies. This represents opposite directions of surface material movements driven by their different rotation periods (4.3 h for Bennu and 7.6 h for Ryugu): toward the equator on Bennu and toward the poles on Ryugu. Furthermore, the spatial distribution of large boulders on Bennu suggests a prior slower rotation (> 5 h), implying a past shape evolution similar to that of Ryugu. Our findings demonstrate that small variations in rotation period, on the scale of a few hours, can drastically change the gravitational field on an asteroid, sometimes even reversing local gravity direction. This drives complex and diverse evolutionary pathways of asteroids, resulting in top-shaped bodies and binary systems observed today.
Public
Mikko Tuomi

In the next few months, from its perch atop a mountain in Chile, the Vera C. Rubin Observatory will begin surveying the #cosmos with the largest camera ever built.

Every three nights, it will produce a map of the entire southern sky filled with #stars, #galaxies, #asteroids and @supernovae — and swarms of bright #satellites ruining some of the view.

Swarms of satellites are harming #astronomy.

Here’s how researchers are fighting back.

nature.com/articles/d41586-025

www.nature.comSwarms of satellites are harming astronomy. Here’s how researchers are fighting backSpaceX and other companies plan to launch tens of thousands of satellites, which could mar astronomical observations and pollute the atmosphere.
Replied in thread
Public
Spaceflight 🚀

The 20-inch diameter #telescope 🔭 will carry out a five-year baseline survey to find at least two-thirds of the unknown #NEOs ☄️ larger than 140 meters 📏. It will launch around 📆 September 2027 to detect and observe #asteroids and comets that could potentially pose an impact 💥 threat to Earth aerotime.aero/articles/spacex-

AeroTime · SpaceX Falcon 9 to launch NASA’s asteroid hunter telescopeNASA has chosen SpaceX to launch an advanced asteroid hunter telescope that will detect and observe asteroids that could pose an impact threat to Earth.
#AsteroidThreat#NASA#Astronomy
Public
David August

Did you know that NNSA, the agency DOGE randomly fired people from without knowing the agency secures our nuclear weapons, also helps prevent asteroids from killing us all?

Well, they do, and now you know.

"NNSA works with partners to detect and mitigate impact threats from potentially hazardous near-Earth objects."

This is just the declassified stuff they do to keep us all from dying.

energy.gov/nnsa/articles/plane

Energy.govPlanetary Defense: TeamworkNNSA works with partners to detect and mitigate impact threats from potentially hazardous near-Earth objects.
#nnsa#doge#USpol
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