Remnants of a lost Planetesimal: Searching for the Angrite parent body

Rider-Stokes, B. G.; Jackson, S. L.; Burbine, T. H.; White, L. F.; Greenwood, R. C.; MacLennan, E.M.; Anand, M.; Yamaguchi, A. and Grady, M. M. (2025). Remnants of a lost Planetesimal: Searching for the Angrite parent body. Icarus, 429, article no. 116429.

DOI: https://doi.org/10.1016/j.icarus.2024.116429

Abstract

It is hypothesized that the Solar System was once populated by Moon to Mars-sized planetary embryos, however, resulting debris from their disruptions is not easily discernible in the modern-day Solar System. Angrites are among the oldest differentiated materials in our Solar System, recording prolonged magmatism, and their parent body is expected to have been Moon to Mars-sized. Even so, no parent body in the modern-day Solar System has been identified. Our UV–Vis-NIR spectra of ten angrites, compared with 712 asteroids, reveal multiple candidates with spectral similarities through curve matching and band-structure analysis. Asteroid (246) Asporina provides the best analog for the angrite meteorites, potentially representing a fragment of a long-lost Moon to Mars-sized body that once resided in the inner Solar System, which was subsequently incorporated into the growing terrestrial planets.

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