Brachinites VNIR reflectance, same achondrite group connecting S-type and A-Type asteroids

Brachinites are an olivine-rich meteorites group displaying equilibrated textures and homogenous mineral phase compositions. Recently, the connection of ungrouped achondrites with brachinites affinity to brachinites has been strengthened [1,2]. The authors investigated 15 samples and compared the results with literature, suggesting that those meteorites should be considered as part of the same group, and derived from the same source, e.g., same parental body, or at least the same reservoir. The main variation within the group could be explained in terms of different initial oxygen fugacities within the region where the parental body accreted [1]. Reflectance properties of few brachinites were measured, but no systematic work has been done on those meteorites yet. Here, we investigate the reflectance properties of 12 brachinites studied in [1] and compared them with laboratory data of other brachinites present in the literature.