Numerical simulations suggest asteroids (101955) Bennu and (162173) Ryugu are likely second or later generation rubble piles
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View abstract on PubMed
Summary
This summary is machine-generated.Near-Earth asteroids Ryugu and Bennu are likely second-generation remnants, not from original asteroid collisions. This explains their younger surface ages compared to their parent asteroid families.
Area Of Science
- Asteroid science
- Planetary geology
- Collisional dynamics
Background
- Rubble pile asteroids are debris from catastrophic collisions.
- Near-Earth asteroids Ryugu and Bennu are linked to main belt asteroid families.
- Surface age data suggests Ryugu and Bennu are younger than their parent families.
Purpose Of The Study
- Investigate the origin of Near-Earth asteroids Ryugu and Bennu.
- Reconcile the age discrepancy between these asteroids and their putative families.
- Determine the generation of asteroid remnants delivered to near-Earth space.
Main Methods
- Coupled collisional and dynamical evolution modeling.
- Analysis of asteroid family members.
- Surface age and crater retention age comparisons.
Main Results
- Ryugu and Bennu are likely second-generation remnants from later disruptions.
- Approximately 80% and 60% of asteroids from New Polana and Eulalia families are second-generation.
- Younger median ages since last disruption align with crater retention ages.
Conclusions
- Asteroid ages can be reconciled with family membership through later disruption events.
- A significant fraction of near-Earth asteroids are second or later-generation remnants.
- This finding impacts our understanding of asteroid evolution and delivery mechanisms.
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