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21-558: [REDACTED] Look up donner in Wiktionary, the free dictionary. Donner may refer to: Places [ edit ] Donner (crater) , a lunar crater Donner, California , an unincorporated community Donner, Louisiana , an unincorporated community Donner Lake , a freshwater lake in California Donner Memorial State Park , site of

42-575: A Canadian book award USS Donner (LSD-20) , a United States naval ship Donner, a Chinese guitar company Donner Block, a wing of William Hulme's Grammar School in northern England Donner Laboratory, a laboratory at University of California, Berkeley Donner Professor, an academic title of the William H. Donner Foundation See also [ edit ] Donar (disambiguation) Doner (disambiguation) Palmer v Donner , an 1868 United States Supreme Court case Sir Magnus Donners,

63-610: A character in the A Dance to the Music of Time cycle of novels by Anthony Powell Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with the title Donner . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Donner&oldid=1227044440 " Categories : Disambiguation pages Place name disambiguation pages Hidden categories: Short description

84-457: A long history of minor impacts. The interior floor is relatively level, and is pock-marked by multiple tiny craterlets. There is a curving ridge in the southern part of the floor that is attached to the inner wall, and possibly forms the remnant of a small crater rim. By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Donner. Lunar craters The word crater

105-478: A recent NELIOTA survey covering 283.5 hours of observation time discovering that at least 192 new craters of a size of 1.5 to 3 meters (4.9 to 9.8 ft) were created during the observation period. In 1978, Chuck Wood and Leif Andersson of the Lunar & Planetary Lab devised a system of categorization of lunar impact craters. They sampled craters that were relatively unmodified by subsequent impacts, then grouped

126-608: A speed of 90,000 km/h (56,000 mph; 16 mi/s). In March 2018, the discovery of around 7,000 formerly unidentified lunar craters via convolutional neural network developed at the University of Toronto Scarborough , Canada was announced. A similar study in December 2020 identified around 109,000 new craters using a deep neural network . Because of the Moon's lack of water , atmosphere , and tectonic plates , there

147-568: Is different from Wikidata All article disambiguation pages All disambiguation pages Donner (crater) Donner is a lunar impact crater on the far side of the Moon . It is located just to the northeast of the Mare Australe , behind the southeastern limb of the Moon. During favorable librations this part of the lunar surface can be brought into view of the Earth , but

168-448: Is little erosion, and craters are found that exceed two billion years in age. The age of large craters is determined by the number of smaller craters contained within it, older craters generally accumulating more small, contained craters. The smallest craters found have been microscopic in size, found in rocks returned to Earth from the Moon. The largest crater called such is about 290 km (180 mi) across in diameter, located near

189-718: The International Astronomical Union . Small craters of special interest (for example, visited by lunar missions) receive human first names (Robert, José, Louise etc.). One of the biggest lunar craters, Apollo , is named after Apollo missions . Many smaller craters inside and near it bear the names of deceased American astronauts, and many craters inside and near Mare Moscoviense bear the names of deceased Soviet cosmonauts. Besides this, in 1970 twelve craters were named after twelve living astronauts (6 Soviet and 6 American). The majority of named lunar craters are satellite craters : their names consist of

210-519: The lunar south pole . However, it is believed that many of the lunar maria were formed by giant impacts, with the resulting depression filled by upwelling lava . Craters typically will have some or all of the following features: There are at least 1.3 million craters larger than 1 km (0.62 mi) in diameter; of these, 83,000 are greater than 5 km (3 mi) in diameter, and 6,972 are greater than 20 km (12 mi) in diameter. Smaller craters than this are being regularly formed, with

231-690: The Donner Camp, where the Donner party was trapped by snow Donner Pass , a mountain pass in California Donner Ski Ranch on Donner Summit, California Donner und Blitzen River , a freshwater river in Oregon Mount Donner , on Vancouver Island, British Columbia, Canada People and animals [ edit ] Donner (surname) Donner family , a renowned and wealthy Finland-Swedish family Donner

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252-512: The Moon's craters were mostly of impact origin. Around 1960, Gene Shoemaker revived the idea. According to David H. Levy , Shoemaker "saw the craters on the Moon as logical impact sites that were formed not gradually, in eons , but explosively, in seconds." Evidence collected during the Apollo Project and from uncrewed spacecraft of the same period proved conclusively that meteoric impact, or impact by asteroids for larger craters,

273-753: The Reindeer or Donder, one of Santa Claus's reindeer Donner woodrush or Luzula subcongesta Donner, a character in Artist Descending a Staircase Donner, a superheroine in Milestone Media comic books Donner, the German name for Thor , a god in Norse mythology Other uses [ edit ] Donner Metals Ltd. , a Canadian mining company Donner Party , an ill-fated pioneer group bound for California in 1846 Donner Prize ,

294-627: The U.S. began to convert the Wood and Andersson lunar impact-crater database into digital format. Barlow is also creating a new lunar impact crater database similar to Wood and Andersson's, except hers will include all impact craters greater than or equal to five kilometers in diameter and is based on the Clementine spacecraft's images of the lunar surface. The Moon Zoo project within the Zooniverse program aimed to use citizen scientists to map

315-408: The craters were caused by projectile bombardment from space, the other, that they were the products of subterranean lunar volcanism . Scientific opinion as to the origin of craters swung back and forth over the ensuing centuries. The competing theories were: Grove Karl Gilbert suggested in 1893 that the Moon's craters were formed by large asteroid impacts. Ralph Baldwin in 1949 wrote that

336-406: The name of a nearby named crater and a capital letter (for example, Copernicus A , Copernicus B , Copernicus C and so on). Lunar crater chains are usually named after a nearby crater. Their Latin names contain the word Catena ("chain"). For example, Catena Davy is situated near the crater Davy . The red marker on these images illustrates the location of the named crater feature on

357-541: The results into five broad categories. These successfully accounted for about 99% of all lunar impact craters. The LPC Crater Types were as follows: Beyond a couple of hundred kilometers in diameter, the central peak of the TYC class disappear and they are classed as basins . Large craters, similar in size to maria, but without (or with a small amount of) dark lava filling, are sometimes called thalassoids. Beginning in 2009 Nadine G. Barlow of Northern Arizona University ,

378-428: The site is viewed from the edge and so not much detail can be seen. This crater has a moderately eroded outer rim, and several small and tiny craterlets lie along the edge. A joined pair of small craters lie across the southern rim and inner wall. An unnamed, crater-like feature with about the same diameter as Donner is attached to the northern outer rim. The structure along the inner wall has been softened and rounded by

399-497: The size and shape of as many craters as possible using data from the NASA Lunar Reconnaissance Orbiter . However, it has since been retired. Craters constitute 95% of all named lunar features. Usually they are named after deceased scientists and other explorers. This tradition comes from Giovanni Battista Riccioli , who started it in 1651. Since 1919, assignment of these names is regulated by

420-693: Was adopted from the Greek word for "vessel" ( Κρατήρ , a Greek vessel used to mix wine and water). Galileo built his first telescope in late 1609, and turned it to the Moon for the first time on November 30, 1609. He discovered that, contrary to general opinion at that time, the Moon was not a perfect sphere, but had both mountains and cup-like depressions. These were named craters by Johann Hieronymus Schröter (1791), extending its previous use with volcanoes . Robert Hooke in Micrographia (1665) proposed two hypotheses for lunar crater formation: one, that

441-413: Was the origin of almost all lunar craters, and by implication, most craters on other bodies as well. The formation of new craters is studied in the lunar impact monitoring program at NASA . The biggest recorded crater was caused by an impact recorded on March 17, 2013. Visible to the naked eye , the impact is believed to be from an approximately 40 kg (88 lb) meteoroid striking the surface at

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