3 ms·

Seismology of rubble-pile asteroids in binary systems

• raattgift 3y ago
  Quoting the paper: "3.1 Tidal deformation as a source of ground motion How consequential are tides for binary asteroid seismology? ... Although the masses of a binary asteroid system are small compared to those of Earth and the Moon, the typical separation of binary asteroids is so small that the tidal accelerations only differ by an order of magnitude from those of the Earth–Moon system" This paper was shared around by the Royal Astronomical Society yesterday and today while by coincidence solid (Earth) tides were raised in another HN discussion about measuring the shape of the earth <https://news.ycombinator.com/item?id=39527639 https://news.ycombinator.com/item?id=39527639>. Quoting myself from there (although 101955 Bennu is not a binary asteroid): "Personally I like the idea of depositing a crash test dummy loaded with sensors onto the surface of (probable) rubble-pile 101955 Bennu. Is it like a ball pit, or like a bean-bag chair? Does the dummy sink or get buried in landslides or fountains of material? (We already know we can send things there (and return them): <https://www.nasa.gov/news-release/nasas-bennu-asteroid-sam https://www.nasa.gov/news-release/nasas-bennu-asteroid-sam>)." Rubble-pile binary asteroids 65803 Didymos & Dimorphos have nice wikipedia entries https://en.wikipedia.org/wiki/65803_Didymos https://en.wikipedia.org/wiki/65803_Didymos and https://en.wikipedia.org/wiki/Dimorphos https://en.wikipedia.org/wiki/Dimorphos . Alas, so far we've only crashed things into the latter: https://science.nasa.gov/planetary-defense-dart/ https://science.nasa.gov/planetary-defense-dart/ (movies, images at https://dart.jhuapl.edu/Gallery/ https://dart.jhuapl.edu/Gallery/ ).
• gene-h 3y ago
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  • deleted 3y ago
    [deleted]