Cepheus (crater)

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Cepheus
Cepheus crater 4067 h2.jpg
Coordinates 40°48′N45°48′E / 40.8°N 45.8°E / 40.8; 45.8 Coordinates: 40°48′N45°48′E / 40.8°N 45.8°E / 40.8; 45.8
Diameter 40 km
Depth 2.8 km
Colongitude 315° at sunrise
Eponym Cepheus, a
King of Aethiopia
Oblique view of Franklin (lower left) and Cepheus (upper right), from Apollo 16 Franklin crater Cepheus crater AS16-P-5587.jpg
Oblique view of Franklin (lower left) and Cepheus (upper right), from Apollo 16

Cepheus is a lunar impact crater that is located in the northeastern part of the Moon, within one crater diameter of the larger crater Franklin to the southeast. To the north-north-east is the flooded crater Oersted. The proximity of this formation to the lunar limb means it appears oblong when viewed from the Earth due to foreshortening.

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.

This is a relatively young formation, and the rim is still sharp and well-defined. The exception is an even younger, bowl-shaped crater that lies across the northeast rim. This is a satellite crater designated Cepheus A. The remaining rim is nearly circular, with outward bulges to the north and south. The inner wall is terraced in places, most notably along the northwest wall. There is a central peak formation at the midpoint of the floor which stretches somewhat to the north and south.

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 Cepheus.

CepheusLatitudeLongitudeDiameter
A41.0° N46.5° E13 km

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De La Rue (crater) impact crater

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Brunner (crater) lunar crater

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Casatus (crater) impact crater

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Demonax (crater) impact crater

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Chebyshev (crater) lunar crater

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Carnot (crater) impact crater

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Comstock (crater) lunar crater

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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.