Promethei Sinus
What Promethei Sinus is
Promethei Sinus is an albedo feature — a region named for how bright or dark it appears from a distance — on Mars, centred at 64.7° S, 80.0° E in the Hellas quadrangle.
Where the name comes from
Prometheus' Bay; Greek mythological character. The International Astronomical Union approved the name in 1958.
What it would take to settle Promethei Sinus
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 64.7° S, 80.0° E.
What this spot has going for it is water — inside the polar zone where Mars keeps its ice. What works against it is sunlight — 53% of the sunlight the sunniest latitude on Mars gets.
Computed from Promethei Sinus'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.