La primaire est très semblable au Soleil (1,28 fois sa masse, de classe G3), la secondaire est un peu plus petite (une naine de classe K, de 0,7 fois la masse du Soleil). Cassiopeia is a constellation found in the northern sky. [5], Another Arab constellation that incorporated the stars of Cassiopeia was the Camel. 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. This depiction is from Augustin Royer's 1679 atlas.[5]. The Chinese astronomers saw several figures in what is modern-day Cassiopeia. The hand is made up of the stars α Cas, β Cas, γ Cas, δ Cas, ε Cas, and η Cas. It is also more distant, at 8200 light-years from Earth. The constellation is named after Cassiopeia, the queen of Aethiopia. In the (sub)tropics it can be seen at its clearest from September to early November, and at low southern, tropical, latitudes of less than 25°S it can be seen, seasonally, low in the North. Cassiopeia is a prominent constellation in the northern sky. [10][c] High in the northern sky, it is circumpolar (that is, it never sets in the night sky) to viewers in the British Isles, Canada and the northern United States. The shower's parent body is a Jupiter family comet, though its specific identity is unknown.[39]. [8] These include the Lapps, for whom the W of Cassiopeia forms an elk antler. [3] Its position in the Northern Celestial Hemisphere means that the whole constellation is visible to observers north of 12°S. 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. [5], The people of the Marshall Islands saw Cassiopeia as part of a great porpoise constellation. Reine vaniteuse qui prétendait qu’elle et sa fille Andromède étaient plus belles que les filles du Dieu Poséidon au point que celui-ci, contrarié et en colère la condamna à tourner sans fin sur la voûte étoilée. C'est une constellation circumpolaire, très facilement reconnaissable grâce à sa forme de « W ». Cassiopeia compared her daughter Andromeda's beauty to that of the sea god Nereus' daughters. In mid of November it culminates at about 21:00 local time (9:00 pm). The constellation takes its name from a queen in Greek mythology. Cassiopeia the Queen is the 25th largest constellation of the 88 modern constellations. The arm is made up of the stars α Per, γ Per, δ Per, ε Per, η Per, and ν Per. Elle comporte entre autres le couple NGC 147 et NGC 185 (galaxies satellites de la Galaxie d’Andromède), l'amas ouvert NGC 7789 (la Rose de Caroline) et M52, qu'on peut trouver en projetant une ligne de α à β Cassiopeiae et en l'étendant sur la même distance à l'ouest. The stars of NGC 457, arrayed in chains, are approximately 10,000 light-years from Earth. In front of the throne, seven lamps were blazing. Cluster, the Owl Cluster, and Caldwell 13. The constellation hosts some of the most luminous stars known, including the yellow hypergiants Rho Cassiopeiae and V509 Cassiopeiae and white hypergiant 6 Cassiopeiae. 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. Les étoiles de type Be sont des étoiles à rotation très rapide ; Tsih tourne sur elle-même à plus de 300 km/s à l'équateur, 150 fois plus vite que le Soleil, et cette rotation entraîne des pertes de matière : la formation de tores ou de disques autour de l'étoile accompagnée d'une baisse de luminosité, allant parfois jusqu'à 1,5 magnitude. β Cassiopeiae (Caph) est une étoile variable de la classe Delta Scuti : elle passe de la magnitude 2,25 à 2,31 en seulement 2 heures et demie. En chinois cependant, elle est nommée Tsih, le fouet. With its very northern declination of +46 to +87 degrees it is circumpolar for most northern hemisphere observers. The five brightest stars of Cassiopeia – Alpha, Beta, Gamma, Delta, and Epsilon Cassiopeiae – form the characteristic W-shaped asterism. 14 déc. 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. Cassiopée A est la source radio la plus intense du ciel[2], et était jusqu'en 2008 considéré comme le reste de supernova le plus jeune de la Voie lactée (ce titre étant actuellement (2016) attribué à SNR G1.9+0.3, âgé d'environ 140 ans)[3]. The people of Pukapuka saw the figure of Cassiopeia as a distinct constellation called Na Taki-tolu-a-Mataliki.[9]. [19] It is a Delta Scuti variable with a small amplitude and period of 2.5 hours. [35], Two members of the Local Group of galaxies are in Cassiopeia. Il s'agit également d'une géante en devenir, son enveloppe est en expansion et son noyau en contraction. Il n'y a guère besoin de prendre un alignement quelconque, l'étoile polaire (près du bord supérieur de l'illustration) est la seule étoile brillante située dans cette direction. Deux heures après le coucher du Soleil, regardez en direction du nord-est. Give it a try! I.e. [11] The official constellation boundaries, as set by Belgian astronomer Eugène Delporte in 1930,[b] are defined by a polygon of 30 segments. [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. Rotating at about 92% of its critical speed, Caph completes a full rotation every 1.12 days. The famous W of Cassiopeia would be unchanged because its stars are much further away than α Centauri, but the Sun would appear as an addition at the leftmost end, closest to ε Cas, creating a zig-zag pattern.[33]. The Heart Nebula and the Soul Nebula are two neighboring emission nebulae about 7,500 light-years away. La constellation se repère directement par sa forme très caractéristique en « M » ou « W » (suivant la saison). Cassiopeia (listen) is a constellation in the northern sky, named after the vain queen Cassiopeia in Greek mythology, who boasted about her unrivaled beauty. Covering 598.4 square degrees and hence 1.451% of the sky, Cassiopeia ranks 25th of the 88 constellations in area. [5], In Welsh Mythology Llys Dôn (literally "The Court of Dôn") is the traditional Welsh name for the constellation. Constellation definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation. La constellation héberge NGC 281 (la nébuleuse Pacman), NGC 7635 (nébuleuse de la Bulle) et les nébuleuses voisines IC 1805 et IC 1848. [25] It is a runaway star, moving at around 2.5 million mph relative to its neighbors (1,100 kilometers per second). These are the seven spirits of God. In the equatorial coordinate system, the right ascension coordinates of these borders lie between 00h 27m 03s and 23h 41m 06s, while the declination coordinates are between 77.69° and 46.68°. Cassiopée: a constellation of services The Flight Ops Efficiency service, which was presented at the 2013 Paris Air Show, allows airlines to reduce their operating costs – fuel costs in particular – and to manage risks, and helps them to improve their operating procedures. The star constellations that can be seen in the night sky depend on the observer’s location and season, and they change throughout the year. 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. 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. It was observed in 1572 by Tycho Brahe and now exists as a bright object in the radio spectrum. 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. Upsilon was later found to be two stars and labelled Upsilon1 and Upsilon2 by John Flamsteed. L'alignement interne du « W », entre Tsih (γ Cas) et Ruchbah (δ Cas), conduit à l'épaule de Persée, Mirphak (α Per), dans l'alignement formé par γ, α et δ Per. Andromeda was then rescued by the hero Perseus, whom she later married. It has a mass 15 times greater than our sun, shines 40,000 times brighter, and forms the central most star in the traditional ‘W’ shape of the constellation. Cepheus and Cassiopeia were placed next to each other among the stars, along with Andromeda. The main stars of Cassiopeia make its tail, Andromeda and Triangulum form its body, and Aries makes its head. [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. This asterism is formed by five bright stars; Epsilon, Ruchbah (Delta), Gamma, Schedar (Alpha Cassiopeiae) and Caph (Beta Cassiopeiae). Les sommets en sont, d'est en ouest, ε, δ, γ, α et β Cassiopeiae, les cinq étoiles les plus brillantes de la constellation. Phi Cassiopeiids are very slow, with an entry velocity of approximately 16.7 kilometers per second. Cassiopeia A is a supernova remnant and the brightest extrasolar radio source in the sky at frequencies above 1 GHz. [10] It is bordered by Cepheus to the north and west, Andromeda to the south and west, Perseus to the southeast and Camelopardalis to the east, and also shares a short border with Lacerta to the west. closer to the zenith) and the W appears inverted. Paramètres de prises de vue de chaque champ de ciel : * 17 photos * … [37], Cassiopeia also contains part of the closest galaxy group to our Local Group, the IC 342/Maffei Group. Though they do not appear in Andromeda, both dwarf galaxies are gravitationally bound to the far larger Andromeda Galaxy. 29 avr. Cassiopée Cassiopeia is as big "W" in the sky a well known and easy to find constellation . Eta Cassiopeiae (Achird[24]) is a spectroscopic binary star with a period of 480 years, and a suspected RS Canum Venaticorum variable. The constellation is visible in some northerly regions of the Southern hemisphere in late spring. The cluster was discovered in 1787 by William Herschel. 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. Software:Photofiltre 7. M103 is far poorer than M52, with only about 25 stars included. 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. At least three of Dôn's children also have astronomical associations: Caer Gwydion ("The fortress of Gwydion") is the traditional Welsh name for the Milky Way, and Caer Arianrhod ("The Fortress of Arianrhod") being the constellation of Corona Borealis.
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