Roche (crater)

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This article is about the crater on the far side of the Moon. For the crater on Phobos, see Phobos (moon).
Roche (crater)
Coordinates 42°18′S 136°30′E / 42.3°S 136.5°E / -42.3; 136.5Coordinates: 42°18′S 136°30′E / 42.3°S 136.5°E / -42.3; 136.5
Diameter 160 km
Depth Unknown
Colongitude 226° at sunrise
Eponym Édouard A. Roche

Roche is a large crater on the far side of the Moon from the Earth. The prominent crater Pauli lies across the southern rim of Roche, and the outer rampart of Pauli covers a portion of Roche's interior floor. To the north-northwest of Roche is the crater Eötvös, and just to the west-northwest lies Rosseland.

The western rim of Roche has been somewhat distorted and straightened. The rim as a whole is worn and eroded, with multiple tiny craterlets marking the surface. The satellite crater Roche B lies across the northeastern inner wall.

The interior floor of Roche is relatively level, but is also marked by several small and tiny craterlets. A grouping of these craters lies near the midpoint. Just to the northwest of this grouping is a bright patch of high-albedo material. Sections of the floor along the north-northwestern side have a lower albedo than elsewhere, usually an indication of basaltic-lava flows similar to what fills the lunar maria. The extent of this patch may actually be larger, but covered with higher-albedo ejecta.

Satellite craters[edit]

By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Roche.

Roche Latitude Longitude Diameter
B 40.1° S 137.2° E 24 km
C 39.0° S 139.2° E 18 km
V 38.5° S 129.3° E 30 km
W 39.0° S 130.5° E 20 km