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Spacecraft Spots Two Asteroids as One
7 Jul
Summary
- Japanese spacecraft Hayabusa2 captured images of Torifune asteroid.
- Torifune is a contact binary, two asteroids fused together.
- Contact binaries pose challenges for asteroid deflection missions.
A recent close flyby by the Japanese spacecraft Hayabusa2 has revealed a fascinating secret about the asteroid Torifune. This space rock, previously little understood, was found to be a 'contact binary,' meaning it is composed of two asteroids that have fused together. This discovery challenges our understanding of asteroid formation, as such mergers are rare given the high speeds at which asteroids typically interact.
Contact binaries, once thought uncommon, are increasingly being detected, with examples like Arrokoth and Selam also noted. These celestial pairs can form through gradual orbital shrinkage or gentle collisions between fragments. The mission's success underscores the value of rapid reconnaissance for characterizing asteroids, crucial for planetary defense efforts.
This finding is particularly relevant for planetary defense. Missions like NASA's DART have practiced deflecting single asteroids. However, a contact binary like Torifune presents a unique challenge; an impactor might pass through the gap between the two lobes or cause unpredictable spinning, complicating deflection strategies.
