|
1872 X1
X/1872 X1, occasionally referred to as "Pogson's Comet", was a probable cometary astronomical object seen from Madras (now Chennai) on December 3 and 4, 1872, by astronomer N. R. Pogson. Pogson believed the object to be the lost Comet Biela, but subsequent orbital calculations have suggested that this was unlikely.Kronk, G. ''Cometography: a catalog of comets, Volume 2'', Cambridge University Press, 2003, p.388 Neither Biela's Comet nor Pogson's object have been recovered since, and the episode remains one of the most puzzling in solar system astronomy. Discovery Pogson's observations were triggered by a great meteor shower (later known as the Andromedids) seen on November 27, 1872: its radiant was observed to be located in a part of the sky which Biela's Comet, last seen in 1852, had been predicted to cross in September, and it was speculated that it might be associated with the comet. As a result, the astronomer Ernst Friedrich Wilhelm Klinkerfues sent a telegram to Pogson, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Astronomical Unit
The astronomical unit (symbol: au, or or AU) is a unit of length, roughly the distance from Earth to the Sun and approximately equal to or 8.3 light-minutes. The actual distance from Earth to the Sun varies by about 3% as Earth orbits the Sun, from a maximum (aphelion) to a minimum (perihelion) and back again once each year. The astronomical unit was originally conceived as the average of Earth's aphelion and perihelion; however, since 2012 it has been defined as exactly (see below for several conversions). The astronomical unit is used primarily for measuring distances within the Solar System or around other stars. It is also a fundamental component in the definition of another unit of astronomical length, the parsec. History of symbol usage A variety of unit symbols and abbreviations have been in use for the astronomical unit. In a 1976 resolution, the International Astronomical Union (IAU) had used the symbol ''A'' to denote a length equal to the astronomical ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lost Comet
A lost comet is one which was not detected during its most recent perihelion passage. This generally happens when data is insufficient to reliably calculate the comet's location or if the solar elongation is unfavorable near perihelion passage. The ''D/'' designation is used for a periodic comet that no longer exists or is deemed to have disappeared. Lost comets can be compared to lost asteroids ( lost minor planets), although calculation of comet orbits differs because of nongravitational forces, such as emission of jets of gas from the nucleus. Some astronomers have specialized in this area, such as Brian G. Marsden, who successfully predicted the 1992 return of the once-lost periodic comet Swift–Tuttle. Overview Loss There are a number of reasons why a comet might be missed by astronomers during subsequent apparitions. Firstly, cometary orbits may be perturbed by interaction with the giant planets, such as Jupiter. This, along with nongravitational forces, can result i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gary W
Gary may refer to: *Gary (given name), a common masculine given name, including a list of people and fictional characters with the name *Gary, Indiana, the largest city named Gary Places ;Iran *Gary, Iran, Sistan and Baluchestan Province ;United States *Gary (Tampa), Florida * Gary, Maryland *Gary, Minnesota *Gary, South Dakota *Gary, West Virginia *Gary – New Duluth, a neighborhood in Duluth, Minnesota *Gary Air Force Base, San Marcos, Texas * Gary City, Texas Ships * USS ''Gary'' (DE-61), a destroyer escort launched in 1943 * USS ''Gary'' (CL-147), scheduled to be a light cruiser, but canceled prior to construction in 1945 * USS ''Gary'' (FFG-51), a frigate, commissioned in 1984 * USS ''Thomas J. Gary'' (DE-326), a destroyer escort commissioned in 1943 People and fictional characters * Gary (surname), including a list of people with the name *Gary (rapper), South Korean rapper and entertainer *Gary (Argentine singer), Argentine singer of cuarteto songs Other uses *'' Gary ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brian G
H. Brian Griffinas shown in Brian Griffin's House of Payne is a fictional character from the American animated television series ''Family Guy''. An anthropomorphic white labrador retriever voiced by Seth MacFarlane, he is one of the show's main characters as a member of the Griffin family. He primarily works in the series as a less-than-adept writer struggling to find himself, attempting essays, novels, screenplays, and newspaper articles. He first appeared on television, along with the rest of the family, in a 15-minute short on December 20, 1998. Brian was created and designed by MacFarlane himself. MacFarlane was asked to pitch a pilot to the Fox Broadcasting Company, based on ''The Life of Larry'' and ''Larry & Steve'', two shorts made by MacFarlane featuring a middle-aged character named Larry and an intellectual dog, Steve. These two are now considered as Peter and Brian. After the pilot was given the green light, the Griffin family appeared in the episode " Death Has a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amédée Guillemin
Amédée Guillemin (born 5 July 1826 in Pierre-de-Bresse, died 2 January 1893 in Pierre-de-Bresse, France) was a French science writer and a journalist. Guillemin started his studies at Beaune Beaune () is the wine capital of Burgundy in the Côte d'Or department in eastern France. It is located between Lyon and Dijon. Beaune is one of the key wine centers in France, and the center of Burgundy wine production and business. The annua ... college before taking his final degree in Paris. From 1850 to 1860 he taught mathematics in a private school while writing articles for the Liberal press criticizing the Second French Empire. In 1860, he moved to Chambéry where he became a junior deputy editor of the weekly political magazine ''La Savoie''. After the Savoy#Annexation and opposition, annexation of Savoy by the French empire, he returned to Paris where he became the science editor of ''l’Avenir national'' (The Nation's Future). Guillemin presently started writing books o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Patrick Moore
Sir Patrick Alfred Caldwell-Moore (; 4 March 1923 – 9 December 2012) was an English amateur astronomer who attained prominence in that field as a writer, researcher, radio commentator and television presenter. Moore was president of the British Astronomical Association; co-founder and president of the Society for Popular Astronomy; author of over seventy books on astronomy; and presenter of the world's longest-running television series with the same original presenter, BBC's ''The Sky at Night'' (from 1957). He became known as a specialist in Moon observation and for creating the Caldwell catalogue. Idiosyncrasies such as his rapid diction and monocle made him a popular and instantly recognisable figure on British television. Outside his field of astronomy, Moore was known for his role on the video game television show '' GamesMaster''. Moore was also a self-taught xylophonist and pianist, as well as an accomplished composer. He was an amateur cricketer, golfer and chess pla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Russell Hind
John Russell Hind FRS FRSE LLD (12 May 1823 – 23 December 1895) was an English astronomer. Life and work John Russell Hind was born in 1823 in Nottingham, the son of lace manufacturer John Hind and Elizabeth Russell, and was educated at Nottingham High School. At age 17 he went to London to serve an apprenticeship as a civil engineer, but through the help of Charles Wheatstone he left engineering to accept a position at the Royal Observatory, Greenwich under George Biddell Airy. Hind remained there from 1840 to 1844, at which time he succeeded W. R. Dawes as director of the private George Bishop's Observatory. In 1853 Hind became Superintendent of the Nautical Almanac, a position he held until 1891. Hind is notable for being one of the early discoverers of asteroids. He also discovered and observed the variable stars R Leporis (also known as Hind's Crimson Star), U Geminorum, and T Tauri (also called Hind's Variable Nebula), and discovered the variability of μ Cephei. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monthly Notices Of The Royal Astronomical Society
''Monthly Notices of the Royal Astronomical Society'' (MNRAS) is a peer-reviewed scientific journal covering research in astronomy and astrophysics. It has been in continuous existence since 1827 and publishes letters and papers reporting original research in relevant fields. Despite the name, the journal is no longer monthly, nor does it carry the notices of the Royal Astronomical Society. History The first issue of MNRAS was published on 9 February 1827 as ''Monthly Notices of the Astronomical Society of London'' and it has been in continuous publication ever since. It took its current name from the second volume, after the Astronomical Society of London became the Royal Astronomical Society (RAS). Until 1960 it carried the monthly notices of the RAS, at which time these were transferred to the newly established ''Quarterly Journal of the Royal Astronomical Society'' (1960–1996) and then to its successor journal ''Astronomy & Geophysics'' (since 1997). Until 1965, MNRAS ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William Henry Stanley Monck
William Henry Stanley Monck (21 April 1839–24 June 1915) was an Irish astronomer and philosopher. After an early education at Kilkenny College, Monck attended Trinity College Dublin. In 1878 he was appointed as Professor of Moral Philosophy and remained in that position until 1892. On 28 August 1892, he became the first person to measure starlight electrically. For many years Monck served as Chief Registrar for the Bankruptcy Division of the High Court of Ireland. He wrote several works about logic, metaphysics, and astronomy, and was the author of a collection of articles in ''Popular Astronomy''. He was also a founding member of the British Astronomical Association, on whose body he served. Early life and family William Henry Stanley Monck was born on 21 April 1839, in Skeirke, County Laois. Tutors helped him in his father's house growing up. He then moved to Dublin and was educated in Trinity College Dublin, where he garnered several accolades, such as first in the Univ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heinrich Kreutz
Heinrich Carl Friedrich Kreutz (September 8, 1854 – July 13, 1907) was a German astronomer, most notable for his studies of the orbits of several sungrazing comets, which revealed that they were all related objects, produced when a very large sun-grazing comet fragmented several hundred years previously. The group is now known as the Kreutz Sungrazers, and has produced some of the brightest comets ever seen. Kreutz was born in Siegen in 1854, and obtained his PhD at the University of Bonn in 1880 on the orbit of comet C/1861 J1. In 1882 he moved to Kiel, working at the observatory and university there. In 1896 he became the editor of the '' Astronomische Nachrichten'', the leading astronomical journal of the time, and held the position until his death in 1907. The minor planet 3635 Kreutz, discovered by Luboš Kohoutek Luboš Kohoutek (, born 29 January 1935) is a Czech astronomer and a discoverer of minor planets and comets, including Comet Kohoutek which was vis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cometary Nucleus
The nucleus is the solid, central part of a comet, once termed a ''dirty snowball'' or an ''icy dirtball''. A cometary nucleus is composed of rock, dust, and frozen gases. When heated by the Sun, the gases sublime and produce an atmosphere surrounding the nucleus known as the coma. The force exerted on the coma by the Sun's radiation pressure and solar wind cause an enormous tail to form, which points away from the Sun. A typical comet nucleus has an albedo of 0.04. This is blacker than coal, and may be caused by a covering of dust. Results from the ''Rosetta'' and ''Philae'' spacecraft show that the nucleus of 67P/Churyumov–Gerasimenko has no magnetic field, which suggests that magnetism may not have played a role in the early formation of planetesimals. Further, the ALICE spectrograph on ''Rosetta'' determined that electrons (within above the comet nucleus) produced from photoionization of water molecules by solar radiation, and not photons from the Sun as thought ea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.jpg "Click for more on -> Cometary Nucleus")