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Earth-grazing Fireball
An Earth-grazing fireball (or Earth grazer) is a fireball, a very bright meteor that enters Earth’s atmosphere and leaves again. Some fragments may impact Earth as meteorites, if the meteor starts to break up or explodes in mid-air. These phenomena are then called Earth-grazing meteor processions and bolides. Famous examples of Earth-grazers are the 1972 Great Daylight Fireball and the Meteor Procession of July 20, 1860.. Txstate.edu (2010-05-28). Retrieved on 2013-10-19.150-year-old meteor mystery solved Overview As an Earth-grazer passes through the atmosphere its mass and velo ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Meteor Of 1860
The 1860 Great Meteor procession occurred on July 20, 1860. It was a unique meteoric phenomenon reported from locations across the United States. American landscape painter Frederic Church saw and painted a spectacular string of fireball meteors cross the Catskill evening sky, an extremely rare Earth-grazing meteor procession. It is believed that this was the event referred to in the poem ''Year of Meteors, 1859-60'', by Walt Whitman. In 2010, 150 years later, it was determined to be an Earth-grazing meteor procession. See also * 1783 Great Meteor The 1783 Great Meteor was a meteor procession observed on 18 August 1783 from the British Isles, at a time when such phenomena were not well understood. The meteor was the subject of much discussion in the ''Philosophical Transactions of the Roya ... * 1913 Great Meteor Procession * 1972 Great Daylight Fireball References {{Modern impact events Meteoroids 1860 in science 1860 in the United States 18600720 Moder ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meteoroid
A meteoroid () is a small rocky or metallic body in outer space. Meteoroids are defined as objects significantly smaller than asteroids, ranging in size from grains to objects up to a meter wide. Objects smaller than this are classified as micrometeoroids or space dust. Most are fragments from comets or asteroids, whereas others are collision impact debris ejected from bodies such as the Moon or Mars. When a meteoroid, comet, or asteroid enters Earth's atmosphere at a speed typically in excess of , aerodynamic heating of that object produces a streak of light, both from the glowing object and the trail of glowing particles that it leaves in its wake. This phenomenon is called a meteor or "shooting star". Meteors typically become visible when they are about 100 km above sea level. A series of many meteors appearing seconds or minutes apart and appearing to originate from the same fixed point in the sky is called a meteor shower. A meteorite is the remains of a meteor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Desert Fireball Network
The Desert Fireball Network (DFN) is a network of cameras in Australia. It is designed to track meteoroids entering the atmosphere, and aid in recovering meteorites. It currently operates 50 autonomous cameras, spread across Western and South Australia, including Nullarbor plain, WA wheatbelt, and South Australian desert, covering an area of 2.5 million km2. The locations of the stations were chosen to facilitate meteorite searching. Starting in 2018, cameras deployed across the world began the first global fireball observatory in association with partner research teams. The DFN observatories capture approximately 30-second exposures of the sky from dusk until dawn every night, and the DFN team is automatically alerted if a fireball or meteor is detected. Based on the long-exposure images, trajectories and orbits are plotted in a semi-automated manner, and a fall-line is generated to indicate the whereabouts and mass of any resultant meteorites on the ground. DFN mission The DFN ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Christmas Eve
Christmas Eve is the evening or entire day before Christmas Day, the festival commemorating the birth of Jesus. Christmas Day is observed around the world, and Christmas Eve is widely observed as a full or partial holiday in anticipation of Christmas Day. Together, both days are considered one of the most culturally significant celebrations in Christendom and Western society. Christmas celebrations in the denominations of Western Christianity have long begun on Christmas Eve, due in part to the Christian liturgical day starting at sunset, a practice inherited from Jewish tradition and based on the story of Creation in the Book of Genesis: "And there was evening, and there was morning – the first day." Many churches still ring their church bells and hold prayers in the evening; for example, the Nordic Lutheran churches. Since tradition holds that Jesus was born at night (based in Luke 2:6-8), Midnight Mass is celebrated on Christmas Eve, traditionally at midnight, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
European Fireball Network
European Fireball Network is an international organization based in Central Europe (Germany and Czech Republic). Its purpose is systematic and simultaneous night observation of meteors and other nebular objects. Description The network was initially located at the Ondřejov Observatory, Czech Republic, after the fall of the Příbram meteorite on 7 April 1959, which was the first meteorite simultaneously observed by several stations. By 1963, the network consisted of five stations. It was later (about 1968) expanded by the installation of about 15 new stations in Germany and named the European Fireball Network. The network currently consists of at least 34 camera stations located in Germany, Czech Republic, Belgium, Luxembourg, Switzerland, Slovakia and Austria at elevations up to 1846 m above mean sea level. The cameras are separated by a distance of about ; they cover an area of about and photograph the entire visible sky. Cameras at Czech stations are equipped with fishey ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aten Asteroid
The Aten asteroids are a dynamical group of asteroids whose orbits bring them into proximity with Earth. By definition, Atens are Earth-crossing asteroids . The group is named after 2062 Aten, the first of its kind, discovered on 7 January 1976 by American astronomer Eleanor Helin at Palomar Observatory. As of 2020, 1841 Atens have been discovered, of which 13 are named. Many Atens are classified as potentially hazardous asteroids. Description Aten asteroids are defined by having a semi-major axis (a) of less than 1.0 astronomical unit (AU), the roughly average distance from the Earth to the Sun. They also have an aphelion (Q; furthest distance from the Sun) greater than 0.983 AU. This defines them as Earth-crossing asteroids as the orbit of Earth varies between 0.983 and 1.017 AU. Asteroids' orbits can be highly eccentric. Nearly all known Aten asteroids have an aphelion greater than 1 AU. Observation of objects inferior to the Earth's orbit is dif ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Earth-grazing Meteoroid Of 13 October 1990
On 13 October 1990, meteoroid EN131090, with an estimated mass of 44 kg, entered the Earth's atmosphere above Czechoslovakia and Poland and, after a few seconds, returned to space. Observations of such events are quite rare; this was the second recorded using scientific astronomical instruments (after the 1972 Great Daylight Fireball) and the first recorded from two distant positions, which enabled the calculation of several of its orbital characteristics. The encounter with Earth significantly changed its orbit and, to a smaller extent, some of its physical properties (mass and structure of its outer layer). Observations Visual observations were reported by three independent Czech observers: astronomer Petr Pravec, Pavel Klásek, and Lucie Bulíčková. According to their report, the event started at 03:27:16±3 UTThe record is in Universal Time (UT), local Central European Time (CET) was 1 hour later. and the observed bright meteor (fireball) moved from sou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Earth
Earth is the third planet from the Sun and the only astronomical object known to harbor life. While large volumes of water can be found throughout the Solar System, only Earth sustains liquid surface water. About 71% of Earth's surface is made up of the ocean, dwarfing Earth's polar ice, lakes, and rivers. The remaining 29% of Earth's surface is land, consisting of continents and islands. Earth's surface layer is formed of several slowly moving tectonic plates, which interact to produce mountain ranges, volcanoes, and earthquakes. Earth's liquid outer core generates the magnetic field that shapes the magnetosphere of the Earth, deflecting destructive solar winds. The atmosphere of the Earth consists mostly of nitrogen and oxygen. Greenhouse gases in the atmosphere like carbon dioxide (CO2) trap a part of the energy from the Sun close to the surface. Water vapor is widely present in the atmosphere and forms clouds that cover most of the planet. More solar e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Natural Satellite
A natural satellite is, in the most common usage, an astronomical body that orbits a planet, dwarf planet, or small Solar System body (or sometimes another natural satellite). Natural satellites are often colloquially referred to as ''moons'', a derivation from the Moon of Earth. In the Solar System, there are six planetary satellite systems containing 209 known natural satellites altogether. Seven objects commonly considered dwarf planets by astronomers are also known to have natural satellites: , Pluto, Haumea, , Makemake, , and Eris. , there are 442 other minor planets known to have natural satellites. A planet usually has at least around 10,000 times the mass of any natural satellites that orbit it, with a correspondingly much larger diameter. The Earth–Moon system is a unique exception in the Solar System; at 3,474 kilometres (2,158 miles) across, the Moon is 0.273 times the diameter of Earth and about of its mass. The next largest ratios are the Neptune– ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meteor Procession Of February 9, 1913
The 1913 Great Meteor Procession occurred on February 9, 1913. It was a meteoric phenomenon reported from locations across Canada, the northeastern United States, and Bermuda, and from many ships at sea, including eight off Brazil, giving a total recorded ground track of over . The meteors were particularly unusual in that there was no apparent radiant, that is to say, no point in the sky from which the meteors appeared to originate. The observations were analysed in detail, later the same year, by the astronomer Clarence Chant, leading him to conclude that as all accounts were positioned along a great circle arc, the source had been a small, short-lived natural satellite of the Earth. John A. O'Keefe, who conducted several studies of the event, proposed that the meteors should be referred to as the ''Cyrillids'', in reference to the feast day of Cyril of Alexandria (February 9 in the Roman Catholic calendar from 1882 to 1969). Events of February 9 The evening of February 9 w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meteor Procession Of July 20, 1860
The 1860 Great Meteor procession occurred on July 20, 1860. It was a unique meteoric phenomenon reported from locations across the United States. American landscape painter Frederic Church saw and painted a spectacular string of fireball meteors cross the Catskill evening sky, an extremely rare Earth-grazing meteor procession. It is believed that this was the event referred to in the poem ''Year of Meteors, 1859-60'', by Walt Whitman. In 2010, 150 years later, it was determined to be an Earth-grazing meteor procession. See also * 1783 Great Meteor The 1783 Great Meteor was a meteor procession observed on 18 August 1783 from the British Isles, at a time when such phenomena were not well understood. The meteor was the subject of much discussion in the ''Philosophical Transactions of the Roya ... * 1913 Great Meteor Procession * 1972 Great Daylight Fireball References {{Modern impact events Meteoroids 1860 in science 1860 in the United States 18600720 Moder ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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