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Adhil
The name Adhil has been applied to a number of stars, especially in the constellation of Andromeda. It is the name approved by the International Astronomical Union for Xi Andromedae. Origin ''Adhil'' was originally applied to the description of Ptolemy's 21st and 22nd of Andromeda in his star catalogue in Latin translated version of ''Almagest''. :Etymology :''Adhil'' is a lingua franca term from an Arabic phrase الذيل ''al-dhayl'' að-ðáil">/nowiki>að-ðáil/nowiki> meaning "the train f a garment (literally "the tail"). :Identification :There are two kind of the identification of Ptolemy's 21st and 22nd of Andromeda. Renaissance times However Bayer gave ''Adhil'' for 60/b And in his prominent work ''Uranometria'' in 1603, and Bode followed Bayer in his great star atlas '' Uranographia'' in 1801. Recent times ''Adhil'' is applied to Xi Andromedae from Manitius' identification of Ptolemy's 21st of Andromeda. See also * Xi Andromedae (recent Adhil) * 60 Andr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xi Andromedae
Xi Andromedae (ξ Andromedae, abbreviated Xi And, ξ And), officially named Adhil , is a solitary star in the northern constellation of Andromeda. It has an apparent magnitude of +4.9. Based on parallax measurements obtained during the Gaia mission, it lies at a distance of roughly from the Sun. Nomenclature ''ξ Andromedae'' ( Latinised to ''Xi Andromedae'') is the star's Bayer designation. It also bears the Flamsteed designation ''46 Andromedae''. Johann Bayer labeled this star "ξ" in his '' Uranometria''. The star appeared in John Flamsteed's ''Atlas Coelestis'', but was unlabeled. It was later designated as ''46 And'' by Jérôme Lalande. The label "ξ" was used in ''Atlas Coelestis'', apparently erroneously, for what Bayer had labeled "A" (Bayer's ''A Andromedae'' has the Flamsteed designation ''49 Andromedae''). It bore the traditional name ''Adhil'', which is derived from the Arabic الذيل ''að-ðayl'' "the train" (lit. "the tail"). In 2016, the Intern ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Andromeda (constellation)
Andromeda is one of the 48 constellations listed by the 2nd-century Greco-Roman astronomer Ptolemy, and one of the 88 modern constellations. Located in the northern celestial hemisphere, it is named for Andromeda, daughter of Cassiopeia, in the Greek myth, who was chained to a rock to be eaten by the sea monster Cetus. Andromeda is most prominent during autumn evenings in the Northern Hemisphere, along with several other constellations named for characters in the Perseus myth. Because of its northern declination, Andromeda is visible only north of 40° south latitude; for observers farther south, it lies below the horizon. It is one of the largest constellations, with an area of 722 square degrees. This is over 1,400 times the size of the full moon, 55% of the size of the largest constellation, Hydra, and over 10 times the size of the smallest constellation, Crux. Its brightest star, Alpha Andromedae, is a binary star that has also been counted as a part of Pegasu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Johann Bayer
Johann Bayer (1572 – 7 March 1625) was a German lawyer and uranographer (celestial cartographer). He was born in Rain, Lower Bavaria, in 1572. At twenty, in 1592 he began his study of philosophy and law at the University of Ingolstadt, after which he moved to Augsburg to begin work as a lawyer, becoming legal adviser to the city council in 1612. Bayer had several interests outside his work, including archaeology and mathematics. However, he is primarily known for his work in astronomy; particularly for his work on determining the positions of objects on the celestial sphere. He remained unmarried and died in 1625. Bayer's star atlas '' Uranometria Omnium Asterismorum'' (" Uranometry of all the asterisms") was first published in 1603 in Augsburg and dedicated to two prominent local citizens. This was the first atlas to cover the entire celestial sphere. It was based upon the work of Tycho Brahe and may have borrowed from Alessandro Piccolomini's 1540 star atlas, ''De ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Syrma
Iota Virginis (ι Virginis, abbreviated Iota Vir, ι Vir) is a binary star in the constellation of Virgo. Its apparent magnitude is 4.08. Based on its parallax, it is assumed to be relatively nearby, at . Its two components are designated Iota Virginis A (officially named Syrma , the traditional name for the system) and B. Nomenclature ''ι Virginis'' ( Latinised to ''Iota Virginis'') is the system's Bayer designation. The designations of the two components as ''Iota Virginis A'' and ''B'' derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU). It bore the traditional name ''Syrma'', derived from the Arabic سرما (تطريز ''sirmā'' "train (of a garment)". In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalogue and standardize proper names for stars. The WGSN approved the name ''Syrma'' for Iota Virginis on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Star Atlas
Celestial cartography, uranography, astrography or star cartography is the aspect of astronomy and branch of cartography concerned with mapping stars, galaxies, and other astronomical objects on the celestial sphere. Measuring the position and light of charted objects requires a variety of instruments and techniques. These techniques have developed from angle measurements with quadrants and the unaided eye, through sextants combined with lenses for light magnification, up to current methods which include computer-automated space telescopes. Uranographers have historically produced planetary position tables, star tables, and star maps for use by both amateur and professional astronomers. More recently, computerized star maps have been compiled, and automated positioning of telescopes uses databases of stars and of other astronomical objects. Etymology The word "uranography" derived from the Greek "ουρανογραφια" (Koine Greek ''ουρανος'' "sky, heaven ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Johann Elert Bode
Johann Elert Bode (; 19 January 1747 – 23 November 1826) was a German astronomer known for his reformulation and popularisation of the Titius–Bode law. Bode determined the orbit of Uranus and suggested the planet's name. Life and career Bode was born in Hamburg. As a youth, he suffered from a serious eye disease that particularly damaged his right eye; he continued to have trouble with his eyes throughout his life. His early promise in mathematics brought him to the attention of Johann Georg Büsch, who allowed Bode to use his own library for study. He began his career with the publication of a short work on the solar eclipse of 5 August 1766. This was followed by an elementary treatise on astronomy entitled ''Anleitung zur Kenntniss des gestirnten Himmels'' (1768, 10th ed. 1844), the success of which led to his being invited to Berlin by Johann Heinrich Lambert in 1772 for the purpose of computing ephemerides on an improved plan. There he founded, in 1774, the well-kno ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Uranometria
''Uranometria'' is a star atlas produced by Johann Bayer. It was published in Augsburg in 1603 by Christoph Mangle (''Christophorus Mangus'') under the full title ''Uranometria: omnium asterismorum continens schemata, nova methodo delineata, aereis laminis expressa''. This translates to "Uranometria, containing charts of all the constellations, drawn by a new method and engraved on copper plates". The word "Uranometria" derives from Urania, muse of the heavens and "uranos" (''oυρανός'') the Greek word for sky / heavens. A literal translation of "Uranometria" is "Measuring the Heavens" (to be compared with "Geometry"—''"Geometria"'' in Greek, literally translated to "Measuring the Earth"). It was the first atlas to cover the entire celestial sphere. Charts ''Uranometria'' contained 51 star charts, engraved on copper plates by Alexander Mair ( 1562–1617). The first 48 charts illustrate each of the 48 Ptolemaic constellations. The 49th chart introduces 12 new cons ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
60 Andromedae
60 Andromedae (abbreviated 60 And) is a star system in the northern constellation of Andromeda, located to the west-northwest of Gamma Andromedae. ''60 Andromedae'' is the Flamsteed designation though the star also bears the Bayer designation b Andromedae. It is bright enough to be seen by the naked eye with an apparent visual magnitude of 4.82. Based upon parallax measurements made during the Hipparcos mission, it is at a distance of roughly from Earth. This system is known to have three components. The primary is a giant star with a stellar classification of , meaning that an overabundance of barium ionized one time is observed in the spectrum of the star, making it a barium star. The secondary component is likely a white dwarf with a period of 748.2 days and an eccentricity of 0.34. There is a third component at an angular separation of 0.22 arcsecond A minute of arc, arcminute (arcmin), arc minute, or minute arc, denoted by the symbol , is a unit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chi Andromedae
Chi Andromedae ( Andromedae, And) is the Bayer designation for a star in the northern constellation of Andromeda. It has an apparent visual magnitude of +5.01, which is relatively faint for a naked-eye star. Based upon parallax measurements made during the Gaia mission, Chi Andromedae is located around from Earth. χ Andromedae is a member of (), meaning ''Heaven's Great General'', together with γ Andromedae, φ Persei, 51 Andromedae, 49 Andromedae, θ Andromedae, τ Andromedae, 56 Andromedae, β Trianguli, γ Trianguli and δ Trianguli. Consequently, the Chinese name for χ Andromedae itself is (, en, the Fifth Star of Heaven's Great General.) This is most likely a spectroscopic binary system with an estimated orbital period of 20.8 years and an eccentricity of 0.37. The primary component has a stellar classification of G8 III, which indicates it is a giant star that has exhausted the supply of hydrogen at its core and evolved away from the main seque ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Omega Andromedae
Omega Andromedae (ω And, ω Andromedae) is the Bayer designation for a slowly co-rotating binary star system in the northern constellation of Andromeda. Parallax measurements made during the ''Gaia'' mission make this system to be approximately from Earth. Its apparent visual magnitude is +4.83, which makes it bright enough to be seen with the naked eye. The primary component has a stellar classification of F5 IVe. The IV luminosity class indicates that it is probably a subgiant star that is in the process of evolving away from the main sequence as the supply of hydrogen at its core depletes. However, Abt (1985) gives a classification of F3 V, suggesting it is an F-type main-sequence star. The measured angular diameter of the primary star is . At the system's estimated distance this yields a size of about 2.2 times that of the Sun. It is emitting about seven times solar luminosity from its outer atmosphere at an effective temperature of . This heat giv ... [...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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