Roche (crater)

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.

This article is about the crater on the far side of the Moon. For the crater on Phobos, see Phobos (moon).

Roche

LRO WAC image, with Roche at center and Pauli at bottom
Coordinates	42.3°S 136.5°E / -42.3; 136.5
Diameter	160 km
Depth	Unknown
Colongitude	226° at sunrise
Eponym	Édouard A. Roche

Oblique view from Lunar Orbiter 3, facing south, with Pauli at top and Roche at center

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

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

References

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• Wlasuk, Peter T. (2000). Observing the Moon. Springer. ISBN 978-1-85233-193-1.CS1 maint: ref=harv (link)