Anděl (crater)
Anděl is a lunar impact crater that lies in the rugged central highlands of the Moon. It was named after the Czech astronomer Karel Anděl. Nearby craters of note include Abulfeda to the south-southeast and Descartes to the east-southeast. About 85 kilometres to the east-northeast of the outer rim is the landing site of the Apollo 16 mission. The eroded outer rim of Anděl has been worn and distorted into a polygon In geometry, a polygon () is a plane figure that is described by a finite number of straight line segments connected to form a closed '' polygonal chain'' (or ''polygonal circuit''). The bounded plane region, the bounding circuit, or the two t ...al shape, and is nearly non-existent to the south where Anděl G intersects the perimeter. The interior floor is nearly flat, with some irregularities to the southeast. There is a tiny craterlet located just to the southeast of the midpoint, but no central peak of any significance. Satellite craters By convention t ...
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Lunar Orbiter 4
Lunar Orbiter 4 was a robotic U.S. spacecraft, part of the Lunar Orbiter Program, designed to orbit the Moon, after the three previous orbiters had completed the required needs for Apollo mapping and site selection. It was given a more general objective, to "perform a broad systematic photographic survey of lunar surface features in order to increase the scientific knowledge of their nature, origin, and processes, and to serve as a basis for selecting sites for more detailed scientific study by subsequent orbital and landing missions". It was also equipped to collect selenodetic, radiation intensity, and micrometeoroid impact data. Mission Summary The spacecraft was placed in a cislunar trajectory and injected into an elliptical near polar high lunar orbit In celestial mechanics, an orbit is the curved trajectory of an object such as the trajectory of a planet around a star, or of a natural satellite around a planet, or of an artificial satellite around an object or ...
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Karel Anděl
Karel Anděl (28 December 1884 – 17 March 1947) was a Czechoslovak astronomer and selenographer. His Mappa Selenographica has been used in Norton's Star Atlas. Bibliography * ''Mappa Selenographica'', 1926, Prague. Awards and honors The following astronomical features were named for him: * Anděl (crater) on the Moon The Moon is Earth's only natural satellite. It is the fifth largest satellite in the Solar System and the largest and most massive relative to its parent planet, with a diameter about one-quarter that of Earth (comparable to the width ...