Apis Tholus
What Apis Tholus is
Apis Tholus is a tholus — a small domical mountain or hill — on Io, 199 km across, centred at 11.9° S, 12.3° E. It is the 58th largest named feature on Io and the 1st largest of its class there.
Where the name comes from
Greek; name for Epaphus, son of Io and Zeus. The International Astronomical Union approved the name in 1979, under the theme it applies to every tholus on Io. Of the 3 features of this class catalogued on Io, the naming categories run Greek (2), Hottentot (1).
What it would take to settle Apis Tholus
Io scores 76.7 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 11.9° S, 12.3° E.
What this spot has going for it is sunlight — 98% of the sunlight the sunniest latitude on Io gets. What works against it is water — same as everywhere else on this world.
Computed from Apis Tholus's catalogued latitude, longitude and feature class — 84% of the model's weight had a basis here, and 2 axes were dropped as not applicable to Io (earth link, known ground). Gravity, pressure, delta-v and distance from the Sun are the same everywhere on Io 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.