Asteroid defense mission shifted the orbit of more than its target
The binary asteroid’s orbit around the Sun was affected by the impact.
TL;DR
- The DART mission intentionally crashed into Dimorphos, the moonlet of the binary asteroid Didymos, to test planetary defense.
- The impact altered Dimorphos' orbit around Didymos by 33 minutes and also changed the entire Didymos system's orbit around the Sun.
- Researchers used stellar occultation, ground-based measurements, and DART's navigation data to detect the subtle heliocentric trajectory change.
- The ejecta from the impact contributed significantly to the momentum transfer, with a momentum enhancement factor (beta) around two.
- Analysis revealed Didymos is relatively solid, while Dimorphos is a low-density rubble pile, likely formed from material shed by Didymos.
- The DART mission successfully demonstrated the kinetic impact method for planetary defense, proving it's a viable path for deflecting asteroid systems.