Urashima
What Urashima is
Urashima is a crater — a circular depression, almost always an impact scar — on Ryugu, 0.3 km across, centred at 8.1° S, 92.9° E. It is the 3rd largest named feature on Ryugu and the 1st largest of its class there.
Where the name comes from
Urashima Taro; fisherman in Japanese fairy tale who rescued a turtle and traveled on its back to the dragon Ryujinâs undersea Ryugu Palace, where he was welcomed by princess Otohime. The International Astronomical Union approved the name in 2018, under the theme it applies to every crater on Ryugu. Of the 7 features of this class catalogued on Ryugu, the naming categories run Japan (4), France (1), Russia (1), The Netherlands (Dutch) (1).
What it would take to settle Urashima
Ryugu scores 58.1 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 8.1° S, 92.9° E.
What this spot has going for it is known ground — 1 km from Hayabusa2 touchdown (2019). What works against it is water — same as everywhere else on this world.
Computed from Urashima'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 Ryugu (radiation geometry, earth link). Gravity, pressure, delta-v and distance from the Sun are the same everywhere on Ryugu 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.