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Ganymede · Patera · 152nd largest named feature

Hamra Patera

Wadi in Jordan, associated with red sandstone cliffs and ancient copper mines.

What Hamra Patera is

Hamra Patera is a patera — an irregular or scalloped-edged crater, usually volcanic — on Ganymede, 43 km across, centred at 77.4° S, 171.4° W. It is the 152nd largest named feature on Ganymede and the 4th largest of its class there.

Where the name comes from

Wadi in Jordan, associated with red sandstone cliffs and ancient copper mines. The International Astronomical Union approved the name in 2015, under the theme it applies to every patera on Ganymede. Of the 6 features of this class catalogued on Ganymede, the naming categories run Jordan (3), Egypt (2), Lebanon (1).

Feature class
an irregular or scalloped-edged crater, usually volcanic
Diameter
43 km
about a marathon
Coordinates
77.4° S, 171.4° W
Planetocentric, on Ganymede
Name approved
2015
By the IAU Working Group for Planetary System Nomenclature
Naming category
Jordan
Asia

What it would take to settle Hamra Patera

Ganymede scores 55 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 77.4° S, 171.4° W.

Settlement difficulty here
63.4/ 100
Among the hardest on this world
Ganymede overall
55
8.4 harder than the median site
Ranked
193rd
of 196 named places on Ganymede

What this spot has going for it is water same as everywhere else on this world. What works against it is radiation geometry inside the open-field polar cap, where the plasma gets down.

Computed from Hamra Patera'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 Ganymede (earth link, known ground). Gravity, pressure, delta-v and distance from the Sun are the same everywhere on Ganymede 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 patera features on Ganymede