Asgard
What Asgard is
Asgard is a large ringed feature — a multi-ring impact basin, the largest class of impact structure there is — on Callisto, 1,400 km across, centred at 32.2° N, 139.9° W. It is the 2nd largest named feature on Callisto and the 2nd largest of its class there.
Where the name comes from
Norse; the home of the gods. The International Astronomical Union approved the name in 1979, under the theme it applies to every large ringed feature on Callisto. Of the 4 features of this class catalogued on Callisto, the naming categories run Norse (2), Eskimo (1), Teutonic (1).
What it would take to settle Asgard
Callisto scores 44.6 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 32.2° N, 139.9° W.
What this spot has going for it is water — same as everywhere else on this world. What works against it is temperature — about -136 °C mean at this latitude.
Computed from Asgard'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 Callisto (earth link, known ground). Gravity, pressure, delta-v and distance from the Sun are the same everywhere on Callisto 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.