A common origin for dynamically associated near-Earth asteroid pairs
arXiv:1905.12058 · doi:10.1016/j.icarus.2019.05.030
Abstract
Though pairs of dynamically associated asteroids in the Main Belt have been identified and studied for over a decade, very few pair systems have been identified in the near-Earth asteroid population. We present data and analysis that supports the existence of two genetically related pairs in near-Earth space. The members of the individual systems, 2015 EE7 -- 2015 FP124 and 2017 SN16 -- 2018 RY7, are found to be of the same spectral taxonomic class, and both pairs are interpreted to have volatile-poor compositions. In conjunction with dynamical arguments, this suggests that these two systems formed via YORP spin-up and/or dissociation of a binary precursor. Backwards orbital integrations suggest a separation age of <10 kyr for the pair 2017 SN16 -- 2018 RY7, making these objects amongst the youngest multiple asteroid systems known to date. A unique separation age was not realized for 2015 EE7 -- 2015 FP124 due to large uncertainties associated with these objects' orbits. Determining the ages of such young pairs is of great value for testing models of space weathering and asteroid spin-state evolution. As the NEO catalog continues to grow with current and future discovery surveys, it is expected that more NEO pairs will be found, thus providing an ideal laboratory for studying time dependent evolutionary processes that are relevant to asteroids throughout the Solar System.
8 figures, 2 tables; Accepted to Icarus
References in corpus (16)
- Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
- Empirical Color Transformations Between SDSS Photometry and Other Photometric Systems
- Dynamics of rotationally fissioned asteroids: Source of observed small asteroid systems
- Compositional distributions and evolutionary processes for the near-Earth object population: Results from the MIT-Hawaii Near-Earth Object Spectroscopic Survey (MITHNEOS
- Formation of asteroid pairs by rotational fission
- Asteroid pairs: a complex picture
- PHOTOMETRYPIPELINE: An Automated Pipeline for Calibrated Photometry
- Observations of 1999 YC and the Breakup of the Geminid Stream Parent
- Asteroid age distributions determined by space weathering and collisional evolution models
- Using the youngest asteroid clusters to constrain the Space Weathering and Gardening rate on S-complex asteroids
- Properties and evolution of NEO families created by tidal disruption at Earth
- The Mission Accessible Near-Earth Objects Survey (MANOS): first photometric results
- Searching for the first Near-Earth Object family
- Apollo asteroids (1566) Icarus and 2007 MK6: Icarus family members?
- Spin Axes and Shape Models of Asteroid Pairs: Fingerprints of YORP and a Path to the Density of Rubble Piles
- Rotationally Resolved Spectroscopy of Asteroid Pairs: No Spectral Variation Suggests Fission is followed by Settling of Dust