Size-Based Spectrophotometric Analysis of the Polana-Eulalia Complex

Abstract

The Polana-Eulalia Complex (PEC) is an Inner Main Belt, C-complex asteroid population that may be the source of the near-Earth asteroid spacecraft mission targets (101955) Bennu and (162173) Ryugu. Here, we report a size-based investigation of the visible (VIS; 0.47 -- 0.89 um) spectrophotometric slopes of the PEC's constituent families, the New Polana and Eulalia Families. Using two releases of the Sloan Digital Sky Survey's Moving Object Catalog as well as the 3rd data release of the Gaia catalog, we present evidence of size-based slope variability within each family. We find that Eulalia family members exhibit lower average slopes than Polana family members in all catalogs' samples, particularly for objects < 9 km in diameter. We are unable to conclude that VIS slope distinguishability between the families is statistically significant, but we explore a potential cause of the bulk slope differences between the PEC families, in addition to providing commentary on size-slope trends generally.

32 pages, 18 figures, 4 tables, Accepted by Icarus on 17 September 2024

References in corpus (19)

• A low mass for Mars from Jupiter's early gas-driven migration
• Solar System Objects Observed in the SDSS Commissioning Data
• The taxonomic distribution of asteroids from multi-filter all-sky photometric surveys
• Origin of water in the inner Solar System: Planetesimals scattered inward during Jupiter and Saturn's rapid gas accretion
• The Yarkovsky and YORP Effects
• Identification and Dynamical Properties of Asteroid Families
• Rubble Pile Asteroids
• Introducing the Eulalia and new Polana asteroid families: re-assessing primitive asteroid families in the inner Main Belt
• A million asteroid observations in the Sloan Digital Sky Survey
• Asteroid Family Physical Properties
• Phase reddening on asteroid Bennu from visible and near-infrared spectroscopy
• Grain Size Effects on UV-MIR (0.2-14 micron) Spectra of Carbonaceous Chondrite Groups
• Near-ultraviolet to visible spectroscopy of the Themis and Polana-Eulalia complex families
• Thermophysical Investigation of Asteroid Surfaces II: Factors Influencing Grain Size
• Asteroids' reflectance from Gaia DR3: Artificial reddening at near-UV wavelengths
• Gaia search for early-formed andesitic asteroidal crusts
• Comparison of optical spectra between asteroids Ryugu and Bennu: II. High-precision analysis for space weathering trends
• Gaia view of primitive inner-belt asteroid families: Searching for the origins of asteroids Bennu and Ryugu
• Origins of colors variability among C-cluster main-belt asteroids