He photographed the galaxy using the Crossley telescope (36-inch/910mm), the reflecting telescope located at Lick Observatory in California. [19], In 2013, astronomers detected phosphorus in Cassiopeia A, which confirmed that this element is produced in supernovae through supernova nucleosynthesis. The stars, from left to right, are Segin (Epsilon Cassiopeiae), Ruchbah (Delta Cassiopeiae), Gamma Cassiopeiae, Schedar (Alpha Cassiopeiae), and Caph (Beta Cassiopeiae). Upsilon was later found to be two stars and labelled Upsilon1 and Upsilon2 by John Flamsteed. The five brightest stars of Cassiopeia – Alpha, Beta, Gamma, Delta, and Epsilon Cassiopeiae – form the characteristic W-shaped asterism. These included Bathsheba, Solomon's mother; Deborah, an Old Testament prophet; and Mary Magdalene, a disciple of Jesus. [22], The other prominent open clusters in Cassiopeia are NGC 457 and NGC 663, both of which have about 80 stars. The star is a known X-ray source. [11] The official constellation boundaries, as set by Belgian astronomer Eugène Delporte in 1930,[b] are defined by a polygon of 30 segments. Andromeda was then rescued by the hero Perseus, whom she later married. The star’s traditional name, Ruchbah, comes from the Arabic rukbah, which means “the knee”. The age of the cluster is estimated to be around 35 million years. Cas A had a flux density of 2720 ± 50 Jy at 1 GHz in 1980. celleci sera sauvée par persée. These outer layers would have cloaked the star and re-absorbed much of the light released as the inner star collapsed. Cassiopée (Cassiopeia), appelée aussi la Chaise ou le Trône, est un une constellation boréale, qui se trouve toujours en opposition à la Grande Ourse, par rapport à l'étoile polaire.Le catalogue de Flamsteed lui attribue cinquante-cinq étoiles principales. [29] Between 240,000 and 270,000 times as luminous as the Sun, it is around 9,160 light-years distant from Earth.

[30][31], 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 hand is made up of the stars α Cas, β Cas, γ Cas, δ Cas, ε Cas, and η Cas. The supernova remnant "Cassiopeia A" lies within the boundaries of the constellation, supernova remnants are nebulas which form after the explosion of a large star. Anja Seidl, Parisian designer specialising in high fashion, created the first draft of Cassiopée collection. [12] Cas A was scanned during another Aerobee rocket flight of 1 October 1964, but no significant X-ray flux above background was associated with the position. [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. [38], Cassiopeia also contains part of the closest galaxy group to our Local Group, the IC 342/Maffei Group. In french, Cassiopée means a constellation of stars. Cassiopeia Constellation Map, by IAU and Sky&Telescope magazine.

The three-letter abbreviation for the constellation, as adopted by the International Astronomical Union in 1922, is "Cas". Perseus and Andromeda were later married. Atypical for a dwarf elliptical galaxy, NGC 185 contains young clusters of stars and shows evidence of star formation that occurred in the cluster until recently. Cassiopeia (pronunciation) is a constellation in the northern sky, named after the vain queen Cassiopeia in Greek mythology, who boasted about her unrivaled beauty.

NGC 147 is another dwarf spheroidal galaxy in Cassiopeia, approximately 2.53 million light years distant. The yellow-white star is 28 times brighter than the Sun and four times the size. The designations Cassiopeia X-1, Cas XR-1, Cas X-1 are no longer used, but the X-ray source is Cas A (SNR G111.7-02.1) at 2U 2321+58. Located 410 ± 20 light-years from Earth,[16] it is a hot blue-white star of spectral type B3 III with a surface temperature of 15,680 K. It is 6.5 times as massive and 4.2 times as wide as the Sun, and belongs to a class of stars known as Be stars—rapidly spinning stars that throw off a ring or shell of matter.[23]. It is in the range from 2.20 to 2.23 magnitudes. It is easily recognizable due to its distinctive 'W' shape, formed by five bright stars. ", Centre de données astronomiques de Strasbourg, "Cosmic X-ray sources, galactic and extragalactic", "Distribution and variability of cosmic X-ray sources", "Infrared Echoes Reveal the Shock Breakout of the Cas A Supernova", "Virtual reality and augmented reality model viewer to explore a 3D hydrodynamic model of supernova remnant Cassiopeia A", Timeline of white dwarfs, neutron stars, and supernovae, Monte Agliale Supernovae and Asteroid Survey, https://en.wikipedia.org/w/index.php?title=Cassiopeia_A&oldid=984065693, Articles using Infobox astronomical event using locally defined parameters, Creative Commons Attribution-ShareAlike License, SN 1671, SN 1667, SN 1680, SNR G111.7-02.1, 1ES 2321+58.5, 3C 461, 3C 461.0, 4C 58.40, 8C 2321+585, 1RXS J232325.4+584838, 3FHL J2323.4+5848, 2U 2321+58, 3A 2321+585, 3CR 461, 3U 2321+58, 4U 2321+58, AJG 109, CTB 110, INTREF 1108, [DGW65] 148, PBC J2323.3+5849, 2FGL J2323.4+5849, 3FGL J2323.4+5849, 2FHL J2323.4+5848, Strongest radio source beyond our solar system, This page was last edited on 17 October 2020, at 23:34. [15] Cas X-1 is Cas A, a Type II SNR at RA 23h 18m Dec +58° 30′.

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. Alpha Cassiopeiae, traditionally called Schedar (from the Arabic Al Sadr, "the breast"), is a four-star system. Messier 52 (NGC 7654) – Atlas Image mosaic courtesy of 2MASS, UMass, IPAC-Caltech, NASA, NSF. It is also more distant, at 8200 light-years from Earth. pour la punir le dieu exige qu'elle sacrifie sa fille andromède. Its discovery was reported in 1948 by Martin Ryle and Francis Graham-Smith, astronomers at Cambridge, based on observations with the Long Michelson Interferometer. [16] 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. It has an apparent magnitude of 10.5. The idea of the brand wants to go further and develop some others natural fiber as flax, hemp, bamboo.

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