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The Moon · Crater · 704th largest named feature

Lyapunov

Aleksandr Mikhailovich; Russian mathematician, engineer (1857-1918).

What Lyapunov is

Lyapunov is a crater — a circular depression, almost always an impact scar — on The Moon, 67.6 km across, centred at 26.4° N, 89.4° E in the Hubble quadrangle. It is the 704th largest named feature on The Moon and the 493rd largest of its class there.

Where the name comes from

Aleksandr Mikhailovich; Russian mathematician, engineer (1857-1918). The International Astronomical Union approved the name in 1964, under the theme it applies to every crater on The Moon. Of the 1615 features of this class catalogued on The Moon, the naming categories run Germany (234), American (229), France (163), Great Britain (160).

Feature class
a circular depression, almost always an impact scar
Diameter
67.6 km
about the width of Yellowstone
Coordinates
26.4° N, 89.4° E
Planetocentric, on The Moon
Name approved
1964
By the IAU Working Group for Planetary System Nomenclature
Quadrangle
Hubble
Map sheet on The Moon
Naming category
Russia
Europe

What it would take to settle Lyapunov

The Moon scores 29.1 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 26.4° N, 89.4° E.

Settlement difficulty here
29.2/ 100
Typical for this world
The Moon overall
29.1
0.1 harder than the median site
Ranked
1039th
of 2,023 named places on The Moon

What this spot has going for it is temperature about -12 °C mean at this latitude. What works against it is water outside the ice-bearing latitudes.

Computed from Lyapunov's catalogued latitude, longitude and feature class — 84% of the model's weight had a basis here, and one axis was dropped as not applicable to The Moon (radiation geometry). Gravity, pressure, delta-v and distance from the Sun are the same everywhere on The Moon 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 crater features on The Moon

All 1,615 craters on The Moon — mapped together, with the naming theme and the size distribution.