Cydnus Rupes
What Cydnus Rupes is
Cydnus Rupes is a rupes — a scarp or cliff — on Mars, 1,551 km across, centred at 52.5° N, 112.2° E in the Casius quadrangle. It is the 44th largest named feature on Mars and the 4th largest of its class there.
Where the name comes from
From albedo feature at 70N, 248W. The International Astronomical Union approved the name in 1985, under the theme it applies to every rupes on Mars. Of the 27 features of this class catalogued on Mars, the naming categories run Greek (17), Latin (5), Roman (1), Egypt (1).
What it would take to settle Cydnus Rupes
Mars scores 26.6 as a world. That number is the same for every square metre of it — but sunlight, water, radiation and the ground under your feet are not. This is the same question asked at 52.5° N, 112.2° E.
What this spot has going for it is known ground — 883 km from Viking 2 (1976). What works against it is ground — broken ground — hard to reach, and worth reaching for the shelter and the exposed strata.
Computed from Cydnus Rupes's catalogued latitude, longitude and feature class — 74% of the model's weight had a basis here, and 2 axes were dropped as not applicable to Mars (radiation geometry, earth link). Gravity, pressure, delta-v and distance from the Sun are the same everywhere on Mars and are already counted in the world's own index, not again here.
What this cannot see: elevation. Slope, local shadowing and the polar “peaks of eternal light” — ridge tops near the poles of a barely tilted world that catch sun almost continuously while a crater floor kilometres away never does — need a terrain model this does not have. Where a real mission targets a pole, that is usually why.
What is next to it
The largest rupes features on Mars
All 27 rupes on Mars — mapped together, with the naming theme and the size distribution.