Large asteroids show distinct shapes and densities based on rotation and composition
In short: Astronomers using the Very Large Telescope observed 42 large asteroids in the main belt to map their 3D shapes and densities. The study found that these celestial bodies generally fall into two categories: spherical and elongated. This physical diversity is primarily driven by how fast the asteroids rotate and their internal chemical makeup.
The researchers used high-resolution imaging to reconstruct the shapes of the targets, revealing that most follow a specific mathematical sequence of rotation. They discovered a bimodal density distribution, separating volatile-poor bodies from volatile-rich ones. However, the study is limited by its reliance on existing mass estimates for many of the objects.
The findings suggest that some asteroids might be fragments of larger parent bodies, with different types representing different layers, such as a core and an outer shell. This provides a new perspective on how the early solar system organized itself.
Why it matters: Understanding asteroid shapes and densities helps reveal the complex history of how our solar system formed.
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