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

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B.G. Rider-Stokes, S.L. Jackson, T.H. Burbine, L.F. White, R.C. Greenwood, E.M. MacLennan, M. Anand, A. Yamaguchi, M.M. Grady

Icarus
In Press, Journal Pre-proof, Available online 9 December 2024

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“Highlights

  • Spectral investigation of the quenched, plutonic and intermediate angrites.
  • Asteroid (246) Asporina spectrally matches the intermediate angrite, NWA 10463.
  • This asteroid may therefore represent a fragment of a first-generation planetesimal.”

“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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