Holetschek (crater)

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Holetschek
Holetschek crater AS17-151-23235.jpg
Oblique Apollo 17 image
Coordinates 27°36′S150°54′E / 27.6°S 150.9°E / -27.6; 150.9 Coordinates: 27°36′S150°54′E / 27.6°S 150.9°E / -27.6; 150.9
Diameter 38 km
Depth Unknown
Colongitude 209° at sunrise
Eponym Johann Holetschek

Holetschek is a lunar impact crater on the far side of the Moon, to the south-southeast of the huge walled plain Gagarin. To the east of Holetschek is the crater Sierpinski. To the west-southwest is the larger satellite crater Holetschek R.

Lunar craters

Lunar craters are impact craters on Earth's Moon. The Moon's surface has many craters, almost all of which were formed by impacts.

Impact crater Circular depression on a solid astronomical body formed by a hypervelocity impact of a smaller object

An impact crater is an approximately circular depression in the surface of a planet, moon, or other solid body in the Solar System or elsewhere, formed by the hypervelocity impact of a smaller body. In contrast to volcanic craters, which result from explosion or internal collapse, impact craters typically have raised rims and floors that are lower in elevation than the surrounding terrain. Impact craters range from small, simple, bowl-shaped depressions to large, complex, multi-ringed impact basins. Meteor Crater is a well-known example of a small impact crater on Earth.

Moon Earths natural satellite

Earth's Moon is an astronomical body that orbits the planet and acts as its only permanent natural satellite. It is the fifth-largest satellite in the Solar System, and the largest among planetary satellites relative to the size of the planet that it orbits. The Moon is, after Jupiter's satellite Io, the second-densest satellite in the Solar System among those whose densities are known.

The perimeter of this crater forms a nearly symmetric circle, with a slight outward bulge to the south-southeast. The rim is not significantly eroded, but a small craterlet is attached to the northern rim, joining it to the satellite crater Holetschek Z to the north. The inner walls are slumped in places, forming a pile of talus along the western base. The interior floor is otherwise relatively featureless.

Scree Broken rock fragments at the base of steep rock faces, that has accumulated through periodic rockfall

Scree is a collection of broken rock fragments at the base of crags, mountain cliffs, volcanoes or valley shoulders that has accumulated through periodic rockfall from adjacent cliff faces. Landforms associated with these materials are often called talus deposits. Talus deposits typically have a concave upwards form, while the maximum inclination corresponds to the angle of repose of the mean debris size.

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 Holetschek.

HoletschekLatitudeLongitudeDiameter
N30.2° S150.1° E19 km
P30.0° S149.5° E16 km
R29.0° S147.5° E69 km
Z26.3° S150.9° E30 km

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References

Ewen Whitaker British astronomer

Ewen Adair Whitaker was a British-born astronomer who specialized in lunar studies. During World War II he was engaged in quality control for the lead sheathing of hollow cables strung under the English Channel as part of the "Pipe Line Under The Ocean" Project (PLUTO) to supply gasoline to Allied military vehicles in France. After the war, he obtained a position at the Royal Greenwich Observatory working on the UV spectra of stars, but became interested in lunar studies. As a sideline, Whitaker drew and published the first accurate chart of the South Polar area of the Moon in 1954, and served as director of the Lunar Section of the British Astronomical Association.

NASA space-related agency of the United States government

The National Aeronautics and Space Administration is an independent agency of the United States Federal Government responsible for the civilian space program, as well as aeronautics and aerospace research.

United States Geological Survey Scientific agency of the United States government

The United States Geological Survey is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, and the natural hazards that threaten it. The organization has four major science disciplines, concerning biology, geography, geology, and hydrology. The USGS is a fact-finding research organization with no regulatory responsibility.