Fig. 5. Schematic illustration of the Acfer 094 parent body formation model.

The parent body grew by agglomeration of fluffy source dust with and without ice through its radial migration from the outer to the inner regions of the solar nebula across the H₂O snow line. The process produced a layered structure inside the parent body, with an ice-rich core and an ice-poor mantle. Around the H₂O snow line, ice-bearing UPLs were incorporated into the mantle. Subsequently, the melting of ice, mainly in the core, induced an aqueous alteration in the parent body. The Acfer 094 meteorite was subsequently ejected from the mantle of the parent body by some destructive processes. Note that we did not describe organics, which might have existed in ice in FISA and ice-bearing UPLs to make it easier to understand. FSA might also have contained some refractory organics.