Dynamical feasibility of (3) Juno as a parent body of the H chondrites
arXiv:2310.18252 · doi:10.1016/j.icarus.2023.115838
Abstract
We test the hypothesis that (3) Juno is a parent body of the H chondrites with dynamical modeling of an asteroid-family-forming impact and comparison to current observational data. Using a dynamical model that includes the Yarkovsky force on a simulated Juno family and a simplified cosmic ray exposure age model we examine the expected distribution of Juno family members in both the main belt and near-Earth orbits over 300 Myrs and the cosmic ray exposure distribution for fragments exiting the main belt via the 3:1J, 5:2J, and 8:3J mean motion resonances. We find that the smallest modeled (10 m) family members of (3) Juno cannot be directly responsible for the observed H chondrite flux and that the breakup of larger family members creates an CRE distribution that resembles the measured H chondrite CRE distribution but is still unable to adequately explain the significant number of H chondrites with CRE ages of 6-8 Myrs. A similar model was performed for the asteroid (6) Hebe, another parent body candidate, and produced a CRE age distribution that is inconsistent with the measured H chondrite CRE ages. We also find from our dynamical models that we can expect 7 km-scale Juno family members in near-Earth orbits in the present day, consistent with the recent discovery of the shock-darkened H chondrite-like asteroid (52768) 1998 OR.
arXiv comment16 pages, 9 figures
References in corpus (17)
- REBOUND: An open-source multi-purpose N-body code for collisional dynamics
- IAS15: A fast, adaptive, high-order integrator for gravitational dynamics, accurate to machine precision over a billion orbits
- WHFast: A fast and unbiased implementation of a symplectic Wisdom-Holman integrator for long term gravitational simulations
- REBOUNDx: A Library for Adding Conservative and Dissipative Forces to Otherwise Symplectic N-body Integrations
- Asteroid families classification: exploiting very large data sets
- Asteroid family ages
- Multiple and Fast: The Accretion of Ordinary Chondrite Parent Bodies
- Thermal history modeling of the H chondrite parent body
- Tuning the Legacy Survey of Space and Time (LSST) Observing Strategy for Solar System Science
- Thermal and Impact History of the H Chondrite Parent Asteroid during Metamorphism: Constraints from Metallic Fe-Ni
- 3D shape of asteroid (6)~Hebe from VLT/SPHERE imaging: Implications for the origin of ordinary H chondrites
- Small Near-Earth Asteroids as a Source of Meteorites
- The James Webb Space Telescopes plan for operations and instrument capabilities for observations in the Solar System
- Composition of Potentially Hazardous Asteroid (214869) 2007 PA8: An H Chondrite from the Outer Asteroid Belt
- The dynamical connection between Phaethon and Pallas
- Physical Characterization of Near-Earth Asteroid (52768) 1998 OR2: Evidence of Shock 1 Darkening/Impact Melt
- The Yarkovsky effect in REBOUNDx