on peut la voir a l'oeil nu ? NGC 185 is a dwarf spheroidal galaxy, approximately 2.08 million light years from Earth. Gamma Cassiopeiae has a minimum magnitude of 3.0 and a maximum magnitude of 1.6, but is generally near magnitude 2.2, with unpredictable fades and brightenings. Cette disposition lui vaut également parfois l'appellation de « Trône de la Reine », elle est également connue sous le nom plus commun de « Chaise », ou plus ancien de « Cerva ». Cassiopeia is a constellation in the northern sky, named after the vain queen Cassiopeia in Greek mythology, who boasted about her unrivaled beauty.Cassiopeia was one of the 48 constellations listed by the 2nd-century Greek astronomer Ptolemy, and it remains one of the 88 modern constellations today.It is easily recognizable due to its distinctive 'W' shape, formed by five bright stars. The Cassiopeia constellation gets its name … However, no direct evidence of this companion has been found, leading to speculation that it might be a white dwarf or other degenerate star. Ptolemy cataloged Cassiopeia and other constellations in the Perseus family in the 2nd century. The Perseid meteor shower is associated with the constellation. Traductions en contexte de "constellation de Casssiopée" en français-anglais avec Reverso Context : Le nom traditionnel pour Alpha Cassiopée, l'étoile la plus au sud de la constellation de Casssiopée. Cassiopeia A, photo: Oliver Krause, George H. Rieke, Emeric Le Floch, Karl D. Gordon, Eiichi Egami, Erick Young, John Bieging, Joannah L. Hinz (Steward Observatory), Stephan M. Birkmann, Sascha P. Quanz (Max Planck Institut fur Astronomie), John P. Hughes (Rutgers University), Dean C. Hines (Space Science Institute). The galaxy was discovered by the English astronomer John Herschel (Caroline Herschel’s brother) in 1787 and first photographed by the American astronomer James Edward Keeler between 1898 and 1900. It is the 25th-largest constellation out of 88, occupying 598 square degrees of sky. [5][6], Cassiopeia has been variously portrayed throughout her history as a constellation. The Pacman Nebula (NGC 281), photo: X-ray: NASA, CXC, CfA, S.Wolk et al; Optical: NSF, AURA, WIYN, Univ. It was also the subject of the first image returned by the Chandra X-Ray Observatory in the late 1990s. The constellation of Cassiopeia is named after a mythical queen from ancient Greece. It has a green-hued primary of magnitude 5.0 and a blue-hued secondary of magnitude 7.3. Constellation in the northern celestial hemisphere, The 41 additional constellations added in the 16th, 17th and 18th centuries, Delporte had proposed standardising the constellation boundaries to the International Astronomical Union, who had agreed and gave him the lead role. It belongs to the spectral class A5. [35], Two members of the Local Group of galaxies are in Cassiopeia. It is similar to the Sun; a yellow-white G-class hydrogen fusing dwarf, slightly cooler than the Sun with a surface temperature of 5730 Kelvin. Entretien Annuel Innovant, Cinéma Cayenne Agora, Matthieu Orphelin Famille, Concours Psychologue Scolaire 2021, Chaise Victoria Polycarbonate, Mécanique Du Point Résumé Pdf, Hélice Moteur Yamaha, Explication 40 Hadith Nawawi, Agence Nouvelair Tunisie, école Boulle Dnmade, " />

constellation de cassiopé

The star is a known X-ray source. In 1572, Tycho Brahe's supernova flared brightly in Cassiopeia. It was named after Cassiopeia, the vain and boastful queen in Greek mythology. A rich section of the Milky Way runs through Cassiopeia, containing a number of open clusters, young luminous galactic disc stars, and nebulae. NGC 281 is an H II region, a large gas cloud in which star formation has recently taken place. [28] It has a minimum magnitude of 6.2 and a maximum magnitude of 4.1; its period is approximately 320 days. It contains a large amount of ionised atomic hydrogen (H II) which is lit by the ultraviolet light of young, hot, blue stars. Epsilon Cassiopeiae is a bright blue-white B-class giant, approximately 440 light years distant. It was nicknamed the Pacman Nebula because of its resemblance to the character from the popular video game. Amazon.de/musik: Various – Der Ruhe Entgegen jetzt kaufen. Its most prominent member is an orange-hued star of magnitude 8.0 near the cluster's edge. Eta Cassiopeiae (Achird[24]) is a spectroscopic binary star with a period of 480 years, and a suspected RS Canum Venaticorum variable. This depiction is from Augustin Royer's 1679 atlas.[5]. [36], IC 10 is an irregular galaxy that is the closest known starburst galaxy and the only one in the Local Group of galaxies. It has a temperature of about 50 million degrees Fahrenheit. Reluctantly, they did so, leaving Andromeda chained to a rock for the monster to find. Delta Cassiopeiae is an eclipsing binary star with a period of 460 days. Cassiopée constellation. The Chukchi of Siberia similarly saw the five main stars as five reindeer stags. Together with the stars Alpheratz in Andromeda and Algenib in Pegasus, Caph was known as one of the Three Guides; three bright stars marking the equinoctial colure, the imaginary line from Caph to Alpheratz to the celestial equator, at a point where the Sun crosses it at each spring and autumn equinox. celestron.com. The star belongs to the spectral class G2Ia0e. [5], Other cultures see a hand or moose antlers in the pattern. This is giving the star an oblate spheroid shape with an equatorial bulge that is 24% larger than the polar radius. It has an apparent magnitude of 3.45. Cassiopée est une des 88 constellations du ciel, visible dans l' hémisphère nord. It was discovered by the British astronomer Caroline Herschel in 1783. The system is 19 light-years from Earth. The star’s rotation speed is 56 km/s and its rotation period is 5.37 days. The cluster was discovered by the French astronomer Pierre Méchain in 1781. Its most prominent member is actually a closer, superimposed double star; it consists of a 7th-magnitude primary and 10th-magnitude secondary. Zum Hauptinhalt wechseln. The yellow-white star is classified as a semi-regular variable. Située à l'opposé de la Grande ourse par rapport à la polaire, cette figure mythologique de la reine Cassiopée pour les grecs, est trés facile à repérer avec sa forme caractéristique en W ou M suivant la saison. The cluster was discovered in 1787 by William Herschel. [16], Epsilon Cassiopeiae has an apparent magnitude of 3.3. [22], Rho Cassiopeiae is a semi-regular pulsating variable yellow hypergiant, among the most luminous stars in the galaxy at approximately 500,000 L☉. It is concentrated towards its center and detached from the star field. [22] Within the 'W' asterism formed by Cassiopeia's five major stars lies Cassiopeia A (Cas A). La constellation Cassiopée, dans le ciel étoilé du 2 janvier 2011. These included Bathsheba, Solomon's mother; Deborah, an Old Testament prophet; and Mary Magdalene, a disciple of Jesus. Delta Scuti variables, which are also known as Dwarf Cepheids, Al Velae or Al Velorum stars, typically show fluctuations in luminosity due to both radial and non-radial pulsations on their surface. Cassiopée est une des 88 constellations visible dans l'hémisphère nord. Though they do not appear in Andromeda, both dwarf galaxies are gravitationally bound to the far larger Andromeda Galaxy. The primary is a white-hued star of magnitude 4.5 and an α2 Canum Venaticorum variable, the secondary is a yellow-hued star of magnitude 6.9, and the tertiary is a star of magnitude 8.4. It is the strongest radio source in the sky outside the solar system and was one of the first radio sources to be discovered, in 1947. The star’s traditional name, Ruchbah, comes from the Arabic rukbah, which means “the knee”. [5], In Welsh Mythology Llys Dôn (literally "The Court of Dôn") is the traditional Welsh name for the constellation. Messier 52 (NGC 7654) – Atlas Image mosaic courtesy of 2MASS, UMass, IPAC-Caltech, NASA, NSF. [30], AO Cassiopeiae is a binary system composed of an O8 main sequence star and an O9.2 bright giant that respectively weigh anywhere between 20.30 and 57.75 times and 14.8 and 31.73 times the mass of the Sun. The charioteer's whip was represented by Gamma Cassiopeiae, sometimes called "Tsih", the Chinese word for "whip". The shell of matter expelled from the star is moving at 4,000 kilometres (2,500 mi) per second; it has a temperature of 30,000 kelvins on average. Anmelden Konto und Listen Anmelden Konto und Listen Bestellungen Entdecken Sie Prime Einkaufs-wagen The brightest star in the constellation is Schedar, Alpha Cassiopeiae. It was discovered by American astronomer E.E. The cloud of material ejected in the explosion is about 10 light years across and is expanding at the rate of 4,000-6,000 km/s. It contains more than 100 stars, which vary widely in brightness. celestron.com. It is classified as a Delta Scuti type variable star. In mythology, Cassiopeia was the wife of King Cepheus (represented by the neighbouring constellation Cepheus in the sky) of Ethiopia. Beta Cassiopeiae, or Caph, is either a subgiant or giant star belonging to the spectral type F2 III-IV, approximately 54.5 light years distant. The star’s other traditional names are al-Sanam al-Nakah and al-Kaff al-Khadib. Its apparent magnitude varies from 4.1 to 6.2. The only Delta Scuti variable brighter than Caph is Altair, the brightest star in the constellation Aquila and 12th brightest star in the sky. Cauta cuvinte şi fraze milioane în toate limbile. Kappa Cassiopeiae is a blue supergiant of spectral type BC0.7Ia that is some 302,000 times as luminous as the Sun and has 33 times its diameter. One look at Medusa’s head turned them all into stone. Alpha Cassiopeiae, traditionally called Schedar (from the Arabic Al Sadr, "the breast"), is a four-star system. Elle fait partie du bras de Persée. The arm is made up of the stars α Per, γ Per, δ Per, ε Per, η Per, and ν Per. Messier 52 is an open cluster, approximately 5,000 light years distant. Une simple … NGC 147 is another dwarf spheroidal galaxy in Cassiopeia, approximately 2.53 million light years distant. Messier 103 is another open cluster in Cassiopeia. Zeta Cassiopeiae (Fulu[24]) is a suspected slowly pulsating B-type star. This is variously said to represent a woman's hand dyed red with henna, as well as the bloodied hand of Muhammad's daughter Fatima. The Chinese astronomers saw several figures in what is modern-day Cassiopeia. Cassiopeia was the wife of King Cepheus of Aethiopia and mother of Princess Andromeda. Cassiopeia is famous for its distinctive W shape, an asterism formed by five bright stars in the constellation. It is around 1.9 times as massive as the Sun, and around 21.3 times as luminous. It is currently in the process of cooling down and will eventually become a red giant. V509 Cassiopeiae is another G-type hypergiant, at least 7,800 light years distant. [21], Delta Cassiopeiae, also known as Ruchbah or Rukbat, meaning "knee," is a possible Algol-type eclipsing binary star with a maximum brightness of magnitude 2.7. It was the last object Charles Messier entered into his catalogue. You can also find pictures of Cephalotaxus, Cattleya, Centradenia, Campanula, Ceratophyllum. She is usually depicted on her throne, still combing her hair. The constellation was first catalogued by the Greek astronomer Ptolemy in the 2nd century, along with other constellations in the … [8] These include the Lapps, for whom the W of Cassiopeia forms an elk antler. It is notable for being the brightest astronomical radio source in the sky. It has an overall magnitude of 6.4 and is approximately 10,000 light-years from Earth, lying in the Perseus arm of the Milky Way. Cassiopeia (listen) is a constellation in the northern sky, named after the vain queen Cassiopeia in Greek mythology, who boasted about her unrivaled beauty. [29] Between 240,000 and 270,000 times as luminous as the Sun, it is around 9,160 light-years distant from Earth. Le nom traditionnel pour Alpha Cassiopée, l'étoile la plus au sud de la constellation de Casssiopée. It has an apparent magnitude of 5.0 and can be seen with binoculars. Every day, Safran Electronics & Defense helps airlines, operators and Original Equipment Manufacturers by collecting, processing and analysing an increasing amount of flight data. At magnitude 2.2, Alpha Cassiopeiae, or Schedar, is generally the brightest star in Cassiopeia, though it is occasionally outshone by the variable Gamma Cassiopeiae, which has reached magnitude 1.6. It was named after Cassiopeia, the vain and boastful queen in Greek mythology. It is a satellite galaxy of the Andromeda Galaxy (Messier 31) and forms a physical pair with NGC 185. Rotating at about 92% of its critical speed, Caph completes a full rotation every 1.12 days. Cepheus turned to an oracle for help and the oracle told him that, in order to appease Poseidon, he and Cassiopeia had to sacrifice their daughter Andromeda to the sea monster. [13] All five are prominent naked eye stars, three are noticeably variable, and a fourth is a suspected low amplitude variable. In Persia, she was drawn by al-Sufi as a queen holding a staff with a crescent moon in her right hand, wearing a crown, as well as a two-humped camel. Phi Cassiopeiids are very slow, with an entry velocity of approximately 16.7 kilometers per second. [31] The two massive stars are so close to each other they distort each other into egg-shapes.[32]. Rho Cassiopeiae is about 10,000 light-years from Earth. It is about 99 light years distant and has an apparent magnitude that varies between 2.68 and 2.74. e-POP Becomes Fourth Member of Swarm Constellation. Rho Cassiopeiae is suspected to already have exploded as a supernova because it has used up most of its nuclear fuel, but if this is the case, the light from the explosion has yet to reach us. Cassiopée (mythologie) Dans la mythologie grecque, épouse orgueilleuse de Céphée et mère d'Andromède, reine d'Éthiopie. [13], The German cartographer Johann Bayer used the Greek letters Alpha through Omega, and then A and B, to label the most prominent 26 stars in the constellation. Kappa, Eta, and Mu Cassiopeiae formed a constellation called the Bridge of the Kings; when seen along with Alpha and Beta Cassiopeiae, they formed the great chariot Wang-Liang. The cluster is also known as Caroline’s Rose or The White Rose because the loops of stars in it resemble the pattern of rose petals. [3] Its position in the Northern Celestial Hemisphere means that the whole constellation is visible to observers north of 12°S. She was the wife of King Cepheus and the mother of Princess Andromeda. [4] She was forced to wheel around the North Celestial Pole on her throne, spending half of her time clinging to it so she does not fall off, and Poseidon decreed that Andromeda should be bound to a rock as prey for the monster Cetus. They were enraged by Cassiopeia’s comments and appealed to Poseidon to punish Cassiopeia for her boastfulness. Cassiopeia is one of the 88 modern constellationswe see today. Achird has a dimmer companion, an orange K-class dwarf with an apparent magnitude of 7.51, located 11 arc seconds away. . The primary and secondary are close together but the primary and tertiary are widely separated. It is in the range from 2.20 to 2.23 magnitudes. Gamma Cassiopeiae is an eruptive variable star that serves as a prototype of a class of stars, the Gamma Cassiopeiae variable stars. It is 2,500 times more luminous than the Sun. Cassiopeia; Medien in der Kategorie „Cassiopeia (constellation)“ Folgende 96 Dateien sind in dieser Kategorie, von 96 insgesamt. [22], The other prominent open clusters in Cassiopeia are NGC 457 and NGC 663, both of which have about 80 stars. NGC 185 is a magnitude 9.2 elliptical galaxy of type E0, 2 million light-years away. [5], The people of the Marshall Islands saw Cassiopeia as part of a great porpoise constellation. It has an apparent magnitude of 3.67. [5], A figure called the "Tinted Hand" also appeared in the stars of Cassiopeia in some Arab atlases. Le styliste commente son défilé, sorte de voyage intersidéral. 2011-08-02 00-32-00-constellations.jpg 3.201 × 5.745; 15,94 MB. [19] It is a Delta Scuti variable with a small amplitude and period of 2.5 hours. celestron.com. It has an active galactic nucleus (AGN). Nicknamed the W constellation, Cassiopeia is easily recognizable for the prominent W asterism formed by its five brightest stars. A rich section of the Milky Way runs through Cassiopeia, stretching from Perseus towards Cygnus, and it contains a number of open clusters, young luminous galactic disc stars, and nebulae. Schedar (Shedir) – α Cassiopeiae (Alpha Cassiopeiae). Gamma Cassiopeiae was the first Be star known (e stands for emission). The constellation was first catalogued by the Greek astronomer Ptolemy in the 2nd century, along with other constellations in the Perseus family (except Lacerta). In Chinese astronomy, the stars forming the constellation Cassiopeia are found among three areas: the Purple Forbidden enclosure (紫微垣, Zǐ Wēi Yuán), the Black Tortoise of the North (北方玄武, Běi Fāng Xuán Wǔ), and the White Tiger of the West (西方白虎, Xī Fāng Bái Hǔ). The star is classified as a semi-regular variable. Cepheus and Cassiopeia were placed next to each other among the stars, along with Andromeda. Philippe. Constellation représente un exemple de la population grecque de la beauté et de son incroyable vantardise, qui avait été placée dans le ciel. "Constellation boundaries: How the modern constellation outlines came to be", "The 2001 US Naval Observatory Double Star CD-ROM. It is a suspected variable star. Cassiopeia A is a supernova remnant and the brightest extrasolar radio source in the sky at frequencies above 1 GHz. The cluster was discovered by Charles Messier in 1774. Cassiopeia, das Sternbild mit der W-Form, [...] ist auf der entgegengesetzten Seite des Pols vom Großen Wagen. Cassiopeia belongs to the Perseus family of constellations, along with Andromeda, Auriga, Cepheus, Cetus, Lacerta, Pegasus, Perseus, and Triangulum. Slightly dimmer and more distant NGC 147 is a magnitude 9.3 elliptical galaxy, like NGC 185 it is an elliptical of type E0; it is 2.3 million light-years from Earth. The Heart Nebula and the Soul Nebula are two neighboring emission nebulae about 7,500 light-years away. [34], NGC 457 is another open cluster in Cassiopeia, also called the E.T. The star was used as a navigational reference point by astronauts. If the Earth's Sun could be observed from α Centauri, the closest star to the Solar System, it would be visible in Cassiopeia as a yellow-white 0.5 magnitude star, far brighter than any of the other stars of the constellation. Cassiopeia, the myth goes, was condemned to circle the celestial pole forever, and spends half the year upside down in the sky as punishment for her vanity. The system’s brightness varies by 0.05 magnitudes. Segin – ε Cassiopeiae (Epsilon Cassiopeiae). Cassiopeia has three stars with known planets and contains two Messier objects: M103 (NGC 581) and M52 (NGC 7654). Objects of magnitude 6.5 are among the faintest visible to the unaided eye in suburban-rural transition night skies. Cassiopeia is a large constellation located in the northern sky. Zeta Cassiopeiae is a blue-white subgiant (spectral type B2IV), approximately 600 light years distant. It was originally discovered by John Herschel in 1829. Cluster, the Owl Cluster, and Caldwell 13. Eta Cassiopeiae is the nearest star in Cassiopeia to our solar system, lying only 19.4 light years away. The constellation is named after Cassiopeia, the queen of Aethiopia. [16] With a luminosity of around 771 times that of the Sun, it has swollen and cooled after exhausting its core hydrogen over its 100 to 200 million-year lifespan, spending much of it as a blue-white B-type main-sequence star. It has around 450 times the Sun's diameter and 17 times its mass, having begun life 45 times as massive as the Sun. The hand is made up of the stars α Cas, β Cas, γ Cas, δ Cas, ε Cas, and η Cas. La constellation de Cassiopée Cassiopée (Cassiopeia) , appelée aussi la Chaise ou le Trône , est un une constellation boréale, qui se trouve toujours en opposition à la Grande Ourse , … M103 is far poorer than M52, with only about 25 stars included. It is the fourth brightest star in the constellation. Its head was composed of Lambda, Kappa, Iota, and Phi Andromedae; its hump was Beta Cassiopeiae; its body was the rest of Cassiopeia, and the legs were composed of stars in Perseus and Andromeda. Gamma Cassiopeiae is a spectroscopic binary star, an optical double with a magnitude 11 companion about two arc seconds away, one with a mass comparable to that of the Sun. The brightest stars in it are two yellow giants of magnitude 7.77 and 8.22. They are usually giants or main sequence stars of spectral types ranging between A0 and F5. It was perhaps observed as a faint star in 1680 by John Flamsteed. Psi Cassiopeiae is a triple star 193 light-years from Earth. The star’s traditional name, Schedar, is derived from the Arabic şadr, which means “breast.” The name refers to the star’s position, marking Cassiopeia’s heart. Les anciens croyaient que c’était l’épouse de l’euphorie du roi éthiopien pour la possession de Cevius et la mère d’Andromède le Saint. Dans ce doux pays baigné de Soleil, la reine Cassiopée, très prétentieuse, se proclamait même plus belle u’Aphrodite, la déesse de l’Amour (Vénus). Cassiopeia contains eight named stars. The first, designated 3C 10 or just Tycho's Supernova Remnant, is the aftermath of the supernova called Tycho's Star. Cassiopeia obţinute în dicţionarul română - franceză la Glosbe, dicţionar online, gratis. Folk / Folklore, Pop Dans la mythologie grecque, Cassiopée (en grec ancien Κασσιόπεια / Kassiópeia), épouse de Céphée, roi d'Éthiopie, prétendit un jour que sa fille Andromède était plus belle que les Néréides, nymphes de la mer pourvues d'une beauté incroyable.. Outrées par cette insolence, les nymphes demandèrent à Poséidon, dieu de la mer, de les venger de cette insulte. Andromeda was then rescued by the hero Perseus, whom she later married. [11] The official constellation boundaries, as set by Belgian astronomer Eugène Delporte in 1930,[b] are defined by a polygon of 30 segments. It is 99.4 ± 0.4 light-years from Earth. The galaxies Maffei 1 and Maffei 2 are located just to the south of the Heart and Soul Nebula. The yellow-white star is 28 times brighter than the Sun and four times the size. Gamma Cassiopeiae is the central star in the W shape and currently the brightest star in the constellation. NGC 457 is looser, and its brightest member is Phi Cassiopeiae, a white-hued supergiant star of magnitude 5.0. [17] Magnitude 8.9 yellow dwarf companion (B) is widely separated; companions (C and D) are closer and magnitudes 13 and 14 respectively. Cassiopée est une des 88 constellations du ciel, visible dans l'hémisphère nord. La Constellation Livresque de Cassiopée ... "Le clocher de Noël et autres crimes impossibles" présenté par Roland Lacourbe. 2011-06-15 23-50-00-stars.jpg 4.216 × 5.425; 22,47 MB. of Alaska, T.A.Rector. Le clocher de Noël et autres crimes impossibles Auteurs : Collectif Présenté par Roland Lacourbe Éditions : L’Archipel (19 novembre 2020) ISBN : 978-2809839685 382 pages Quatrième de couverture. The Nereids were the 50 sea nymphs fathered by the Titan Nereus. It has an apparent magnitude of 10.5. Prime entdecken Hallo! NGC 663 is both closer, at 8200 light-years from Earth, and larger, at 0.25 degrees in diameter. NGC 457 is fairly rich; it is a Shapley class e and Trumpler class I 3 r cluster. NGC 281 Dans la direction de la constellation de Cassiopé La nébuleuse PACMAN s’étend sur 35’ d’arc (80 années-lumière), et avec une magnitude 7, elle est visible avec un télescope amateur (du moins en dehors des agglomérations). Two Messier objects, M52 (NGC 7654) and M103 (NGC 581), are located in Cassiopeia; both are open clusters. The amount of X-ray radiation that it emits is 10 times higher than that of other B or Be class stars. Camera : Canon EOS 500D Lens : Canon EF-S 18-55mm f/3.5-5.6 IS II celestron.com. She was placed in the sky as a punishment after enraging Poseidon with the boast that her daughter Andromeda was more beautiful than the Nereids or, alternatively, that she herself was more beautiful than the sea nymphs. Selon la légende, cette La reine se vante une fois que sa fille et elle sont plus belles que les Néréides. He photographed the galaxy using the Crossley telescope (36-inch/910mm), the reflecting telescope located at Lick Observatory in California. I. [5] In Hawaii, Alpha, Beta, and Gamma Cassiopeiae were named. Barnard in 1883. Cassiopeia includes V509 Cassiopeiae, a second example of the extremely rare yellow hypergiants, which is around 400,000 times as luminous as the Sun and 14 times as massive,[28] as well as 6 Cassiopeiae which is a hotter white hypergiant. The galaxy is classified as a type 2 Seyfert galaxy. [22], but this has never been confirmed. Elle est circumpolaire aux latitudes de la France métropolitaine, c'est-à-dire qu'elle ne passe jamais sous l'horizon. Covering 598.4 square degrees and hence 1.451% of the sky, Cassiopeia ranks 25th of the 88 constellations in area. The stars of NGC 457, arrayed in chains, are approximately 10,000 light-years from Earth. The proper names of stars that have been officially approved by the International Astronomical Union (IAU) are Achird, Caph, Castula, Fulu, Nushagak, Ruchbah, Schedar, and Segin. USS Cassiopeia (AK-75) was a United States Navy Crater-class cargo ship named after the constellation. It lies in the first quadrant of the northern hemisphere (NQ1) and can be seen at latitudes between +90° and -20°. [14] Within the constellation's borders, there are 157 stars brighter than or equal to apparent magnitude 6.5.[d][10]. Le nom moderne de ce groupe d’étoiles a été présenté par les anciens Grecs. Tycho Brahe's supernova was visible within Cassiopeia, and the star Tycho G is suspected of being the donor of the material that triggered that explosion. Its luminosity varies between magnitudes 4.75 and 5.5. It is also more distant, at 8200 light-years from Earth. M52, once described as a "kidney-shaped" cluster, contains approximately 100 stars and is 5200 light-years from Earth. Cassiopée, la constellation en forme de [...] « W », est située du côté opposé à la Grande Ourse au pôle. It is approximately 11,650 light years distant and one of the most luminous stars known. However, she was saved in the last minute by the Greek hero Perseus, who happened to be passing by, saw Andromeda and rescued her from the monster. regade la constellation de persée (au nord est juste sous le w de cassiopé) j'ai mis une carte sur mon site : [..] > on peut la voir a l'oeil nu ? NGC 185 is a dwarf spheroidal galaxy, approximately 2.08 million light years from Earth. Gamma Cassiopeiae has a minimum magnitude of 3.0 and a maximum magnitude of 1.6, but is generally near magnitude 2.2, with unpredictable fades and brightenings. Cette disposition lui vaut également parfois l'appellation de « Trône de la Reine », elle est également connue sous le nom plus commun de « Chaise », ou plus ancien de « Cerva ». Cassiopeia is a constellation in the northern sky, named after the vain queen Cassiopeia in Greek mythology, who boasted about her unrivaled beauty.Cassiopeia was one of the 48 constellations listed by the 2nd-century Greek astronomer Ptolemy, and it remains one of the 88 modern constellations today.It is easily recognizable due to its distinctive 'W' shape, formed by five bright stars. The Cassiopeia constellation gets its name … However, no direct evidence of this companion has been found, leading to speculation that it might be a white dwarf or other degenerate star. Ptolemy cataloged Cassiopeia and other constellations in the Perseus family in the 2nd century. The Perseid meteor shower is associated with the constellation. Traductions en contexte de "constellation de Casssiopée" en français-anglais avec Reverso Context : Le nom traditionnel pour Alpha Cassiopée, l'étoile la plus au sud de la constellation de Casssiopée. Cassiopeia A, photo: Oliver Krause, George H. Rieke, Emeric Le Floch, Karl D. Gordon, Eiichi Egami, Erick Young, John Bieging, Joannah L. Hinz (Steward Observatory), Stephan M. Birkmann, Sascha P. Quanz (Max Planck Institut fur Astronomie), John P. Hughes (Rutgers University), Dean C. Hines (Space Science Institute). The galaxy was discovered by the English astronomer John Herschel (Caroline Herschel’s brother) in 1787 and first photographed by the American astronomer James Edward Keeler between 1898 and 1900. It is the 25th-largest constellation out of 88, occupying 598 square degrees of sky. [5][6], Cassiopeia has been variously portrayed throughout her history as a constellation. The Pacman Nebula (NGC 281), photo: X-ray: NASA, CXC, CfA, S.Wolk et al; Optical: NSF, AURA, WIYN, Univ. It was also the subject of the first image returned by the Chandra X-Ray Observatory in the late 1990s. The constellation of Cassiopeia is named after a mythical queen from ancient Greece. It has a green-hued primary of magnitude 5.0 and a blue-hued secondary of magnitude 7.3. Constellation in the northern celestial hemisphere, The 41 additional constellations added in the 16th, 17th and 18th centuries, Delporte had proposed standardising the constellation boundaries to the International Astronomical Union, who had agreed and gave him the lead role. It belongs to the spectral class A5. [35], Two members of the Local Group of galaxies are in Cassiopeia. It is similar to the Sun; a yellow-white G-class hydrogen fusing dwarf, slightly cooler than the Sun with a surface temperature of 5730 Kelvin.

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