We investigate the spectral reflectance of the surface

of Phobos using remote sensing data obtained by the

HRSC on the European Mars Express mission. Color

ratios reveal that the Phobos surface is

heterogeneous, in agreement with previous studies

based on Phobos-2 and Mars Reconnaissance Orbiter

data

Andreev, M.

Grechishchev, A.

Malinnikov, V.