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Atget (crater)
Atget crater is distinctive on the planet Mercury's surface due to its dark color. Atget crater is located within Caloris basin, near Apollodorus crater and Pantheon Fossae. The dark color of the floor of Atget is in contrast to other craters within Caloris basin that exhibit bright materials on their floors, such as the craters Kertész and Sander. Other craters on Mercury, such as Bashō and Neruda, have halos of dark material but the dark material does not cover the crater floors. A confirmed ''dark spot'' is present in Atget. The crater's name was adopted by the International Astronomical Union (IAU) in 2008, shortly after its discovery on the first flyby of MESSENGER. It is named for the French photographer Eugène Atget Eugène Atget (; 12 February 1857 – 4 August 1927) was a French ''flâneur'' and a pioneer of documentary photography, noted for his determination to document all of the architecture and street scenes of Paris before their disappearance to mod ... ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
MESSENGER
''MESSENGER'' was a NASA robotic space probe that orbited the planet Mercury between 2011 and 2015, studying Mercury's chemical composition, geology, and magnetic field. The name is a backronym for "Mercury Surface, Space Environment, Geochemistry, and Ranging", and a reference to the messenger god Mercury from Roman mythology. ''MESSENGER'' was launched aboard a Delta II rocket in August 2004. Its path involved a complex series of flybys – the spacecraft flew by Earth once, Venus twice, and Mercury itself three times, allowing it to decelerate relative to Mercury using minimal fuel. During its first flyby of Mercury in January 2008, ''MESSENGER'' became the second mission, after Mariner 10 in 1975, to reach Mercury. ''MESSENGER'' entered orbit around Mercury on March 18, 2011, becoming the first spacecraft to do so. It successfully completed its primary mission in 2012. Following two mission extensions, the spacecraft used the last of its maneuvering propellant to deo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Raditladi Quadrangle
The Raditladi quadrangle (H-4) is one of fifteen quadrangles on Mercury. It runs from 270 to 180° longitude and 20 to 70° latitude. Named after the Raditladi Basin, it was mapped in detail for the first time after ''MESSENGER'' entered orbit around Mercury in 2011. It had not been mapped prior to that point because it was one of the six quadrangles that was not illuminated (with the exception of a thin strip of its territory along the eastern border with Shakespeare quadrangle) when ''Mariner 10'' made its flybys in 1974 and 1975. These six quadrangles continued to be known by their albedo feature names, with this one known as the Liguria quadrangle. The Caloris basin is centered in Raditladi quadrangle, though it overlaps significantly with the Tolstoj and Shakespeare quadrangles. The Borealis quadrangle is north of Raditladi quadrangle. To the west is Hokusai quadrangle, and to the east is Shakespeare quadrangle. To the southwest is Eminescu quadrangle, and to the so ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mercury (planet)
Mercury is the smallest planet in the Solar System and the closest to the Sun. Its orbit around the Sun takes 87.97 Earth days, the shortest of all the Sun's planets. It is named after the Roman god ' ( Mercury), god of commerce, messenger of the gods, and mediator between gods and mortals, corresponding to the Greek god Hermes (). Like Venus, Mercury orbits the Sun within Earth's orbit as an inferior planet, and its apparent distance from the Sun as viewed from Earth never exceeds 28°. This proximity to the Sun means the planet can only be seen near the western horizon after sunset or the eastern horizon before sunrise, usually in twilight. At this time, it may appear as a bright star-like object, but is more difficult to observe than Venus. From Earth, the planet telescopically displays the complete range of phases, similar to Venus and the Moon, which recurs over its synodic period of approximately 116 days. The synodic proximity of Mercury to Earth makes Mercury most ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eugène Atget
Eugène Atget (; 12 February 1857 – 4 August 1927) was a French ''flâneur'' and a pioneer of documentary photography, noted for his determination to document all of the architecture and street scenes of Paris before their disappearance to modernization. Most of his photographs were first published by Berenice Abbott after his death. Though he sold his work to artists and craftspeople, and became an inspiration for the surrealists, he did not live to see the wide acclaim his work would eventually receive. Biography Jean-Eugène-Auguste Atget was born 12 February 1857 in Libourne. His father, carriage builder Jean-Eugène Atget, died in 1862, and his mother, Clara-Adeline Atget née Hourlier died shortly after; he was an orphan at age seven. He was brought up by his maternal grandparents in Bordeaux and after finishing secondary education joined the merchant navy.Paris: pp. 240–246 Photographers A–Z: p. 17 Atget moved to Paris in 1878. He failed the entrance exam for act ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caloris Basin
Caloris Planitia is a plain within a large impact basin on Mercury, informally named Caloris, about in diameter. It is one of the largest impact basins in the Solar System. "Calor" is Latin for "heat" and the basin is so-named because the Sun is almost directly overhead every second time Mercury passes perihelion. The crater, discovered in 1974, is surrounded by the Caloris Montes, a ring of mountains approximately tall. Appearance Caloris was discovered on images taken by the '' Mariner 10'' probe in 1974. Its name was suggested by Brian O'Leary, astronaut and member of the ''Mariner 10'' imagery team. It was situated on the terminator—the line dividing the daytime and nighttime hemispheres—at the time the probe passed by, and so half of the crater could not be imaged. Later, on January 15, 2008, one of the first photos of the planet taken by the '' MESSENGER'' probe revealed the crater in its entirety. The basin was initially estimated to be about in diameter, thoug ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apollodorus (crater)
Apollodorus is an impact crater on Mercury. Its unusual appearance, with radiating dark troughs, led to a nickname of "the Spider" by scientists before its official name was decided. Apollodorus is located near the center of Pantheon Fossae, which is a system of radial grabens situated in the inner part of the Caloris basin. The floor, rim and walls of Apollodorus expose a low reflectance material (LRM) excavated during the impact from beneath the light volcanic plains, which cover the central part of the Caloris. It is not currently known whether it played a role in the fossae's formation or if its location is merely a coincidence, although no graben appears to cut the crater rim, and the dark impact ejecta partially covers grabens, suggesting that Apollodorus postdates Pantheon Fossae. In addition, the crater is slightly (by about 40 km) offset from the exact center of the Pantheon Fossae. Apollodorus of Damascus is credited as the architect of the Pantheon Pantheon may ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pantheon Fossae
The Pantheon Fossae are a radial set of troughs in a region in the middle of Caloris Basin on Mercury. They appear to be a set of graben formed by extensional faults, with a 40 km crater located near the center of the pattern. The exact origin of this pattern of troughs is not currently known. The feature was nicknamed "the Spider" before receiving its official name.MESSENGER: MErcury Surface, Space ENvironment, GEochemistry, and Ranging The name is taken from the in Rome, an ancient temple with a classic domed roof. The dome of the Pant ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kertész (crater)
Located in the western edge of Mercury's giant Caloris basin, Kertész crater (named in 2008 for André Kertész, a Hungarian-born American photographer) has some unusual, bright material located on its floor. Sander A sander is a power tool used to smooth surfaces by abrasion with sandpaper. Sanders have a means to attach the sandpaper and a mechanism to move it rapidly contained within a housing with means to hand-hold it or fix it to a workbench. Woodwo ... crater, located in the northwestern edge of Caloris basin, also shows bright material on its floor. Just northeast of Kertész a small crater has very bright rays and ejecta, indicating that the crater is young. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sander (crater)
Sander is a crater on Mercury within Caloris Basin Caloris Planitia is a plain within a large impact basin on Mercury, informally named Caloris, about in diameter. It is one of the largest impact basins in the Solar System. "Calor" is Latin for "heat" and the basin is so-named because the Sun .... It has dark walls and bright patches on its floor. Unlike the rays of Bashō crater, the bright areas are not believed to be immature, but they are inherently bright. It is named after the German photographer August Sander (1876–1964). Hollows are present within Sander. A confirmed ''dark spot'' is present in Sander.Zhiyong Xiao, Robert G. Strom, David T. Blewett, Paul K. Byrne, Sean C. Solomon, Scott L. Murchie, Ann L. Sprague, Deborah L. Domingue, Jörn Helbert, 2013. ''Dark spots on Mercury: A distinctive low-reflectance material and its relation to hollows''. Journal of Geophysical Research Planets.doi.org/10.1002/jgre.20115/ref> This dark spot is associated with the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bashō (crater)
Bashō is a crater on Mercury named after Matsuo Bashō, a 17th-century Japanese writer. Bashō crater is only in diameter, but is a prominent feature on Mercury's surface, due to its bright rays. Photographs from NASA's '' Mariner 10'' and ''MESSENGER'' spacecraft show a curious halo of dark material around the crater. Bashō is one of the largest craters of the Kuiperian system on Mercury. The largest is Bartók crater.Denevi, B. W., Ernst, C. M., Prockter, L. M., and Robinson, M. S., 2018. The Geologic History of Mercury. In ''Mercury: The View After MESSENGER ''MESSENGER'' was a NASA robotic space probe that orbited the planet Mercury between 2011 and 2015, studying Mercury's chemical composition, geology, and magnetic field. The name is a backronym for "Mercury Surface, Space Environment, Geoche ...'' edited by Sean C. Solomon, Larry R. Nittler, and Brian J. Anderson. Cambridge Planetary Science. Chapter 6, Table 6.4. Basho crater 0167015.jpg, Mariner 10 i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neruda (crater)
Neruda is a crater on Mercury. It has a diameter of 112 kilometers. Its name was adopted by the International Astronomical Union 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, outreac ... (IAU) in 2008. Neruda is named for the Chilean poet Pablo Neruda, who lived from 1904 to 1973. To the northeast of Neruda is Sher-Gil crater. Further to the northwest are Grainger and Beckett craters. References Impact craters on Mercury Pablo Neruda {{Mercury-planet-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Astronomical Union
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, education, and development through global cooperation. It was founded in 1919 and is based in Paris, France. The IAU is composed of individual members, who include both professional astronomers and junior scientists, and national members, such as professional associations, national societies, or academic institutions. Individual members are organised into divisions, committees, and working groups centered on particular subdisciplines, subjects, or initiatives. As of 2018, the Union had over 13,700 individual members, spanning 90 countries, and 82 national members. Among the key activities of the IAU is serving as a forum for scientific conferences. It sponsors nine annual symposia and holds a triannual General Assembly that sets policy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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