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Study of basaltic asteroids through their phase curves

2024; Oxford University Press; Volume: 536; Issue: 1 Linguagem: Inglês

10.1093/mnras/stae2612

1365-2966

Plícida Arcoverde, Weslley Pereira, Eduardo Rondón, Filipe Monteiro, Marçal Evangelista-Santana, Jonatan Michimani, Hissa Medeiros, José Silva, T. Rodrigues, D. Lazzaro,

High-pressure geophysics and materials

ABSTRACT Characterized by a composition that highlights extensive geochemical differentiation processes, basaltic asteroids are considered fragments of differentiated bodies. To study the smallest bodies in this population, an important tool is the photometric phase curve that can exhibit different behaviours according to the surface properties of the body. We present here the phase curves obtained for 10 V-type asteroids, nine belonging to the main belt population and one a near-Earth object, with observations acquired at the Observatório Astronômico do Sertão de Itaparica (Brazil). Different behaviours of the phase curves were found, as already obtained by studies of polarimetric curves. Adding to our results in the phase curves of 20 V-types from the literature, we found behaviours not expected for objects of moderate to high albedo in the opposition effect region. We attribute this result to the way regoliths are distributed on the surface of small asteroids, which are different from those of larger objects, although the surface composition is the same.