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RS Ophiuchi
RS Ophiuchi (''RS Oph'') is a recurrent nova system approximately 5,000 light-years away in the constellation Ophiuchus. In its quiet phase it has an apparent magnitude of about 12.5. It has been observed to erupt in 1898, 1933, 1958, 1967, 1985, 2006 and 2021 and reached about magnitude 5 on average. A further two eruptions, in 1907 and 1945, have been inferred from archival data. The recurrent nova is produced by a white dwarf star and a red giant in a binary system. About every 15 years, enough material from the red giant builds up on the surface of the white dwarf to produce a thermonuclear explosion. The white dwarf orbits close to the red giant, with an accretion disc concentrating the overflowing atmosphere of the red giant onto the white dwarf. Properties RS Ophiuchi is a system consisting of a white dwarf with a red giant companion. The stars are in a binary system with an orbital period of around 454 days. Eruptive history The chart below shows when every recor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Recurrent Nova RS Ophiuchi As Seen 23 FEB 2006 From Mt Laguna, Calif
Recurrence and recurrent may refer to: *''Disease recurrence'', also called relapse *''Eternal recurrence'', or eternal return, the concept that the universe has been recurring, and will continue to recur, in a self-similar form an infinite number of times across infinite time or space *Historic recurrence, the repetition of similar events in history *Poincaré recurrence theorem, Henri Poincaré's theorem on dynamical systems *Radial recurrent artery – arising from the radial artery immediately below the elbow *Recursive definition *Recurrent neural network, a special artificial neural network *Recurrence period density entropy, an information-theoretic method for summarising the recurrence properties of dynamical systems *Recurrence plot, a statistical plot that shows a pattern that re-occurs *Recurrence relation, an equation which defines a sequence recursively *Recurrent rotation, a term used in contemporary hit radio for frequently aired songs *''Recurrence'' The Railway Chil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Warren Morrison
A warren is a network of wild rodent or lagomorph, typically rabbit burrows. Domestic warrens are artificial, enclosed establishment of animal husbandry dedicated to the raising of rabbits for meat and fur. The term evolved from the medieval Anglo-Norman concept of free warren, which had been, essentially, the equivalent of a hunting license for a given woodland. Architecture of the domestic warren The cunicularia of the monasteries may have more closely resembled hutches or pens, than the open enclosures with specialized structures which the domestic warren eventually became. Such an enclosure or ''close'' was called a ''cony-garth'', or sometimes ''conegar'', ''coneygree'' or "bury" (from "burrow"). Moat and pale To keep the rabbits from escaping, domestic warrens were usually provided with a fairly substantive moat, or ditch filled with water. Rabbits generally do not swim and avoid water. A ''pale'', or fence, was provided to exclude predators. Pillow mounds The most cha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RS Oph 2021
RS may refer to: Businesses and organizations Sport * RS Sailing, an international designer and builder of sailboats and dinghies * Ford TeamRS, Ford Motor Company's European performance car and motorsport division * Renault Sport, performance and motorsport division of automobile manufacturer Renault * Queens Park Rangers F.C., a professional football club from Shepherd's Bush, London, commonly nicknamed 'The Rs' Other businesses and organizations * RS Group, entertainment & media company in Thailand * RS Group plc, electronics & industrial distributor in England ** RS Components, an international electronic component distributor * Relief Society, an official auxiliary of The Church of Jesus Christ of Latter-day Saints (LDS Church) * République solidaire, a French political party * Roberval and Saguenay Railway (reporting mark RS) * Russian Party (''Ruska stranka''), a political party in Serbia Places * Republic of Serbia, country (ISO 3166-1 code RS) * Republic of Sloven ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AAVSO Light Curve Of RS Oph 2005 Outburst In Various Bandpasses
The American Association of Variable Star Observers (AAVSO) is an international nonprofit organization, founded in 1911, focused on coordinating, analyzing, publishing, and archiving variable star observations made largely by amateur astronomers. The AAVSO creates records that establish light curves depicting the variation in brightness of a star over time, and makes them available to professional astronomers, researchers, and educators. Since professional astronomers do not have the time or the resources to monitor every variable star, astronomy is one of the few sciences where amateurs can make genuine contributions to scientific research. During 2011, the 100th year of the AAVSO's existence, the 20-millionth variable star observation was received into the database. The AAVSO International Database (AID) stores over 35 million observations as of 2019. The organization receives nearly 1,000,000 observations annually from around 2,000 professional and amateur observers and is quot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Longwood, Florida
Longwood is a city in Seminole County, Florida, United States. The population was 15,087 at the 2020 census. It is part of the Orlando–Kissimmee–Sanford, Florida Metropolitan Statistical Area. Geography Longwood is located at . According to the United States Census Bureau, the city has a total area of , of which is land and (5.17%) is water. The city has had two of the oldest trees in America within its borders: The Senator and the remaining Lady Liberty. Demographics At the 2020 census, there were 15,087 people and 5,697 households in the city. The population density was . There were 5,680 housing units at an average density of . The racial makeup of the city was 78.5% White, 8.3% African American, 0.1% Native American, 2.7% Asian, 0.0% Pacific Islander, 0.3% from other races, and 6.7% from two or more races. Hispanic or Latino of any race were 19.2% of the population. There were 5,697 households. The median household income was $65,651.00. History With the a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cyrus Fernald
Cyrus (Persian: کوروش) is a male given name. It is the given name of a number of Persian kings. Most notably it refers to Cyrus the Great ( BC). Cyrus is also the name of Cyrus I of Anshan ( BC), King of Persia and the grandfather of Cyrus the Great; and Cyrus the Younger (died 401 BC), brother to the Persian King Artaxerxes II of Persia. Etymology Cyrus, as a word in English, is the Latinized form of the Greek Κῦρος, ''Kȳros'', from Old Persian ''Kūruš''. According to the inscriptions the name is reflected in Elamite ''Kuraš'', Babylonian ''Ku(r)-raš/-ra-áš'' and Imperial Aramaic ''kwrš''. The modern Persian form of the name is '' Kūroš''. The etymology of Cyrus has been and continues to be a topic of discussion amongst historians, linguists, and scholars of Iranology. The Old Persian name "kuruš" has been interpreted in various forms such as "the Sun", "like Sun", "young", "hero," and "humiliator of the enemy in verbal contest" and the Elamite "kura ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leslie Peltier
Leslie Copus Peltier (January 2, 1900 – May 10, 1980) was an American amateur astronomer and discoverer of several comets and novae, including Nova Herculis 1963. He was once described as "the world's greatest non-professional astronomer" by Harlow Shapley. Biography Leslie Copus Peltier was born in Delphos, Ohio. Delphos is located in northwestern Ohio in both Van Wert and Allen County. His homeplace was located on South Bredeick Street, and his home is still standing today. The home was known as Brookehaven. Peltier married Dorothy Nihiser in November 1933. An amateur astronomer, he was a prolific discoverer of comets and also a persistent observer of variable stars and member of the AAVSO. He was co-discoverer of 12 comets, 10 of which carry his name, and over a span of more than 60 years made more than 132,000 variable star observations. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Y Ophiuchi
Y, or y, is the twenty-fifth and penultimate letter of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. According to some authorities, it is the sixth (or seventh if including W) vowel letter of the English alphabet. In the English writing system, it mostly represents a vowel and seldom a consonant, and in other orthographies it may represent a vowel or a consonant. Its name in English is ''wye'' (pronounced ), plural ''wyes''. Name In Latin, Y was named ''I graeca'' ("Greek I"), since the classical Greek sound , similar to modern German ''ü'' or French ''u'', was not a native sound for Latin speakers, and the letter was initially only used to spell foreign words. This history has led to the standard modern names of the letter in Romance languages – ''i grego'' in Galician, ''i grega'' in Catalan, ''i grec'' in French and Romanian, ''i greca'' in Italian – all meaning "Greek I". The names ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Italy
Italy ( it, Italia ), officially the Italian Republic, ) or the Republic of Italy, is a country in Southern Europe. It is located in the middle of the Mediterranean Sea, and its territory largely coincides with the homonymous geographical region. Italy is also considered part of Western Europe, and shares land borders with France, Switzerland, Austria, Slovenia and the enclaved microstates of Vatican City and San Marino. It has a territorial exclave in Switzerland, Campione. Italy covers an area of , with a population of over 60 million. It is the third-most populous member state of the European Union, the sixth-most populous country in Europe, and the tenth-largest country in the continent by land area. Italy's capital and largest city is Rome. Italy was the native place of many civilizations such as the Italic peoples and the Etruscans, while due to its central geographic location in Southern Europe and the Mediterranean, the country has also historically been home ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bologna
Bologna (, , ; egl, label= Emilian, Bulåggna ; lat, Bononia) is the capital and largest city of the Emilia-Romagna region in Northern Italy. It is the seventh most populous city in Italy with about 400,000 inhabitants and 150 different nationalities. Its metropolitan area is home to more than 1,000,000 people. It is known as the Fat City for its rich cuisine, and the Red City for its Spanish-style red tiled rooftops and, more recently, its leftist politics. It is also called the Learned City because it is home to the oldest university in the world. Originally Etruscan, the city has been an important urban center for centuries, first under the Etruscans (who called it ''Felsina''), then under the Celts as ''Bona'', later under the Romans (''Bonōnia''), then again in the Middle Ages, as a free municipality and later ''signoria'', when it was among the largest European cities by population. Famous for its towers, churches and lengthy porticoes, Bologna has a well-preserved ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
