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Characterizing the Size-Based Slope Trends for Inner Main Belt C-Complex Families.

Presentation #411.06 in the session Asteroids: Main Belt (Poster)

Published onOct 23, 2023
Characterizing the Size-Based Slope Trends for Inner Main Belt C-Complex Families.

Inner Main Belt (IMB) families of carbon-rich asteroids (C-complex families) are the most prevalent source of carbonaceous meteorites delivered to Earth. The near-Earth asteroids Bennu and Ryugu, the targets of the OSIRIS-REx and Hayabusa2 sample return missions, likely originate from C-complex families in the IMB. Prior work found that the visible (VIS) spectral slopes of C-complex families show a trend of decreasing spectral slope with increasing size to a transition diameter, after which the slopes increase with increasing size (Thomas et al. 2021). Thomas et al. (2021) also found that the transition diameter was smaller for families that are closer to the Sun. The Erigone Family was the only IMB family studied in that prior work , but IMB C-complex families exhibit a range of hydration states, which could affect the size-slope trends in a predictable way (Arredondo et al., 2021a; Arredondo et al., 2021b; Arredondo et al., 2020). To study the effect of hydration state in regard to the size-slope trends, we identified members of IMB C-complex families by comparing lists of IMB C-complex families with variable, known hydration states (Nesvorny et al., 2015) with the 4th Release of the Sloan Digital Sky Survey’s Moving Object Catalog (SDSSMOC4; Ivezić et al., 2001). We parsed the SDSSMOC4 to extract VIS photometric data in the g’, r’, i’, and z’ filters for the Erigone, Chaldaea, Clarissa, Klio, and Sulamitis families. The photometric magnitudes for each extracted object were converted to fluxes, and the extracted samples from the SDSSMOC4 were sorted by H-magnitude (Proxy for size) and binned. Each family was compared to the Erigone Family by including their VIS photometric data with the existing Erigone Family analysis from Thomas et al. (2021). In this work, we present the results of these analyses, with a focus on searching for the dependencies of size vs slope trends on hydration fraction of the families.

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