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Maskelyne is a solitary
lunar Lunar most commonly means "of or relating to the Moon". Lunar may also refer to: Arts and entertainment * ''Lunar'' (series), a series of video games * "Lunar" (song), by David Guetta * "Lunar", a song by Priestess from the 2009 album ''Prior t ...
impact crater An impact crater is a circular depression in the surface of a solid astronomical object formed by the hypervelocity impact of a smaller object. In contrast to volcanic craters, which result from explosion or internal collapse, impact craters ...
that lies in the southeast part of the
Mare Tranquillitatis Mare Tranquillitatis (Latin ''tranquillitātis'', the Sea of Tranquillity or Sea of Tranquility; see spelling differences) is a lunar mare that sits within the Tranquillitatis basin on the Moon. It is the first location on another world to be ...
. Its diameter is 22 km. It was named after British astronomer
Nevil Maskelyne Nevil Maskelyne (; 6 October 1732 – 9 February 1811) was the fifth British Astronomer Royal. He held the office from 1765 to 1811. He was the first person to scientifically measure the mass of the planet Earth. He created the ''British Nau ...
. The outer rim has a somewhat
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 toge ...
al shape, although it is generally circular. The inner walls are
terrace Terrace may refer to: Landforms and construction * Fluvial terrace, a natural, flat surface that borders and lies above the floodplain of a stream or river * Terrace, a street suffix * Terrace, the portion of a lot between the public sidewalk a ...
d and there is a low central rise at the midpoint of the floor. The landing site of the
Apollo 11 Apollo 11 (July 16–24, 1969) was the American spaceflight that first landed humans on the Moon. Commander Neil Armstrong and lunar module pilot Buzz Aldrin landed the Apollo Lunar Module ''Eagle'' on July 20, 1969, at 20:17 UTC, an ...
expedition is located about 250 kilometers to the west-southwest. To the northeast are Wallach and
Aryabhata Aryabhata (ISO: ) or Aryabhata I (476–550 CE) was an Indian mathematician and astronomer of the classical age of Indian mathematics and Indian astronomy. He flourished in the Gupta Era and produced works such as the ''Aryabhatiya'' (which ...
. To the southeast is the bright
Censorinus Censorinus was a Roman grammarian and miscellaneous writer from the 3rd century AD. Biography He was the author of a lost work ''De Accentibus'' and of an extant treatise ''De Die Natali'', written in 238, and dedicated to his patron Quintus ...
. To the south are the lunar mountains informally known as Duke Island and
Boot Hill Boot Hill, or Boothill, is the given name of many cemeteries, chiefly in the Western United States. During the 19th and early 20th century it was a common name for the burial grounds of gunfighters, or those who " died with their boots on" (i.e ...
. There are sinuous
rille Rille (German for 'groove') is typically used to describe any of the long, narrow depressions in the surface of the Moon that resemble channels. The Latin term is ''rima'', plural ''rimae''. Typically, a rille can be several kilometers wid ...
s southwest and west of Maskelyne - these were informally named ''Sidewinder'' and ''Diamondback'' by the
Apollo 10 Apollo 10 (May 18–26, 1969) was a human spaceflight, the fourth crewed mission in the United States Apollo program, and the second (after Apollo8) to orbit the Moon. NASA described it as a "dress rehearsal" for the first Moon landing, and ...
crewApollo 10 Flight Journal, Part 19
''We is down among them'', Corrected Transcript and Commentary by David Woods, Robin Wheeler, and Ian Roberts. Last update: 2017-02-10 and referred to as such by later missions, especially Apollo 11.


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 Maskelyne. The following craters have been renamed by the
IAU The International Astronomical Union (IAU; french: link=yes, Union astronomique internationale, UAI) is a nongovernmental organisation with the objective of advancing astronomy in all aspects, including promoting astronomical research, outreach ...
. * Maskelyne E — ''See'' Aryabhata (crater). * Maskelyne H — ''See'' Wallach (crater). File:Maskelyne F crater AS15-M-2683.jpg,
Apollo 15 Apollo 15 (July 26August 7, 1971) was the ninth crewed mission in the United States' Apollo program and the fourth to Moon landing, land on the Moon. It was the first List of Apollo missions#Alphabetical mission types, J mission, with a ...
image of Maskelyne F File:AS10-31-4580 Maskelyne F crater.jpg, Oblique view of Maskelyne F from
Apollo 10 Apollo 10 (May 18–26, 1969) was a human spaceflight, the fourth crewed mission in the United States Apollo program, and the second (after Apollo8) to orbit the Moon. NASA described it as a "dress rehearsal" for the first Moon landing, and ...


References

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External links

{{Commonscat
LTO-61D4
Maskelyne Orientalis, Lunar Topographic Orthophotomap (LTO) Series
Location of Maskelyne Crater in Google Moon

Lunar Orbiter 2 frame 5
showing part of Maskelyne F Impact craters on the Moon