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We analyze images of a rock on Ryugu acquired in situ by MASCam, camera ofthe MASCOT lander, with the aim of identifying possible carbonaceous chondrite(CC) analogs. The rock's reflectance ($r_{\rm F} = 0.034 \pm 0.003$ at phaseangle $4.5^\circ \pm 0.1^\circ$) is consistent with Ryugu's averagereflectance, suggesting that the rock is typical for this asteroid. Aspectrophotometric analysis of the rock's inclusions provides clues to CC groupmembership. Inclusions are generally brighter than the matrix. The dominantvariation in their color is a change of the visible spectral slope, with manyinclusions being either red or blue. Spectral variation in the red channelhints at the presence of the 0.7~$\mu$m absorption band linked to hydratedphyllosilicates. The inclusions are unusually large for a CC; we find thattheir size distribution may best match that of the Renazzo (CR2) and Leoville(CV3) meteorites. The Ryugu rock does not easily fit into any of the CC groups,consistent with the idea that typical Ryugu-type meteorites are too fragile tosurvive atmospheric entry.

Spectrophotometric analysis of the Ryugu rock seen by MASCOT: Searching for a carbonaceous chondrite analog