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, in astronomy, a constellation of the northern sky easily recognized by a group of five bright stars forming a slightly irregular W. It lies at 1 hour right ascension and 60° north declination. In mid of November it culminates at about 21:00 local time (9:00 pm). [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. With its very northern declination of +46 to +87 degrees it is circumpolar for most northern hemisphere observers. 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. 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]. Constellation maps divide the celestial sphere into 88 parts, known as constellations, helping astronomers locate stars and deep sky objects. The system is 19 light-years from Earth. The Chinese astronomers saw several figures in what is modern-day Cassiopeia. 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. C'est une géante orange, 42 fois plus grande que le Soleil et 855 fois plus lumineuse. This is giving the star an oblate spheroid shape with an equatorial bulge that is 24% larger than the polar radius. [16] Around 1.2 billion years old, it has used up its core hydrogen and begun expanding and cooling off the main sequence. I.e. [26] Its magnetic field and wind of particles creates a visible bow shock 4 light-years ahead of it, colliding with the diffuse, and usually invisible, interstellar gas and dust. 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. 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). 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°. The constellation takes its name from a queen in Greek mythology. [22], but this has never been confirmed. In front of the throne, seven lamps were blazing. [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. [5], In Welsh Mythology Llys Dôn (literally "The Court of Dôn") is the traditional Welsh name for the constellation. In 1572, Tycho Brahe's supernova flared brightly in Cassiopeia. Software:Photofiltre 7. This depiction is from Augustin Royer's 1679 atlas.[5]. The five brightest stars of Cassiopeia – Alpha, Beta, Gamma, Delta, and Epsilon Cassiopeiae – form the characteristic W-shaped asterism. Sigma Cassiopeiae is a binary star 1500 light-years from Earth. The cluster was discovered in 1787 by William Herschel. 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.

Anja and Christian met differents professionals of catering trade in order to define their needs. [20], Gamma Cassiopeiae is the prototype Gamma Cassiopeiae variable star, a type of variable star that has a variable disc of material flung off by the high rotation rate of the star. 14 déc. 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. The constellation is named after Cassiopeia, the queen of Aethiopia. It contains more than 100 stars, which vary widely in brightness. In the northern skies (recognizable from its W shape) is the familiar constellation of Cassiopeia, one of the 48 traditional constellations The next seven brightest stars in Cassiopeia are also all confirmed or suspected variable stars, including 50 Cassiopeiae which was not given a Greek letter by Bayer and is a suspected variable with a very small amplitude. Mosaïque de 5 champ de ciel. The constellation is visible in some northerly regions of the Southern hemisphere in late spring. C'est une constellation circumpolaire, très facilement Il semblerait que la fusion de l'hydrogène ait cessé dans son noyau et que celle de l'hélium ait pris le relais. 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. Two Messier objects, M52 (NGC 7654) and M103 (NGC 581), are located in Cassiopeia; both are open clusters. [38], The December Phi Cassiopeiids are a recently discovered early December meteor shower that radiates from Cassiopeia. [22], The other prominent open clusters in Cassiopeia are NGC 457 and NGC 663, both of which have about 80 stars. The galaxies Maffei 1 and Maffei 2 are located just to the south of the Heart and Soul Nebula. The primary and secondary are close together but the primary and tertiary are widely separated. It was observed in 1572 by Tycho Brahe and now exists as a bright object in the radio spectrum.

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