Fig. 3
From: Visibility analysis of Phobos to support a science and exploration platform
Phobos DTM by Willner et al. (2014), as published at https://pds-geosciences.wustl.edu/mex/mex-msa-hrsc-5-refdr-phobos-maps-v1/mexhrs_5001/data/dtm/. Colour indicates the radius of Phobos as a function of location. The red arrow indicates the Mars-facing vector, parallel with the positive x axis. Left – Points on a 6° x 6° lat,lon grid sampling the DTM, at which visibility metrics are evaluated in this study. Right – Plate carée projection of the DTM. The Mars-facing vector, at lat=0°, lon=0° is marked by the red circle